Field of the invention

The present invention relates generally to polymorphisms, and in particular single nucleotide polymorphisms (SNP), associated with increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN). In particular, the present invention provides methods for predicting increased resistance of a rainbow trout to infectious pancreatic necrosis (IPN) and methods for selecting a rainbow trout having increased resistant to infectious pancreatic necrosis. The present invention further provides rainbow trout, rainbow trout cells and populations thereof carrying at least one allele, such as at least two alleles, conferring IPN resistance ("IPN resistance allele") in their genome as well as nucleic acid molecules comprising nucleotide sequences associated with the SNPs of the present invention.

Background of the invention Infectious Pancreatic Necrosis (IPN) is a viral disease causing large mortalities in the farming of rainbow trout, in Norway and internationally. The disease is caused by the IPN virus (IPNV), classified as an aquatic biRNA virus, causing necrosis of pancreatic cells and liver cells, resulting in lethargy and sudden mortality.

Breeding companies like AquaGen AS have run continuous fish selection programs aimed at improving the aquaculture stocks with regards to disease resistance and protocols have been developed for testing the fish's resistance to several specific diseases. These challenge tests have been used in order to select fish as broodstock that possess above-average resistance to the diseases in question. Conventional tests involve controlled challenge-testing of siblings of the breeding candidates. This methodology is, however, impeded by the fact that infected fish cannot be used as broodstock (parents of the next generation). One therefore has to resort to selecting random (un-tested) animals from the families of the tested fish that performed best in the challenge test (so-called family selection).

There is therefore a need for improved methodologies for assessing the resistance of rainbow trout to Infectious Pancreatic Necrosis (IPN), particularly methodologies that allow the direct assaying and selection of individual's resistant to IPN, while retaining the possibility of using the tested fish as broodstock.

l Summary of the invention

The present inventors have solved this need by having identified polymorphism, and in particular single nucleotide polymorphisms (SNP), within the genome, and more particularly on chromosome 1 , of rainbow trout which are associated with increased resistance of the fish to infectious pancreatic necrosis (IPN).

The present invention provides in a first aspect a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN). Particularly, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the presence of at least one (such as at least two) allele conferring IPN resistance ("IPN resistance allele") within the genome (e.g. on chromosome 1 of the genome) of said rainbow trout.

According to certain embodiments, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229 by 1 to 5, such as 1 to 2, nucleotide substitutions.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to certain other embodiments, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX-

89949832, AX-89916790 AX-89973719 AX-89962023,, AX-89921280, AX-89931666, AX- 89921585, AX-89953905 AX-89952945 AX-89934682,, AX-89951942, AX-89937020, AX- 89924837, AX-89958601 AX-89923477 AX-89959350,, AX-89929482, AX-89937712, AX- 89949602, AX-89925103 AX-89938051 AX-89924174,, AX-89936461 , AX-89916703, AX- 89935317, AX-89966423 AX-89933348 AX-89969315,, AX-89919958, AX-89968417, AX- 89946851 , AX-89976917 AX-89945446 AX-89919457,, AX-89973597, AX-89938138, AX- 89971866, AX-89958882 AX-89961273 AX-89944901 ,, AX-89919465, AX-89959425, AX- 89917102, AX-89959281 AX-89916766 AX-89920507,, AX-89957370, AX-89934009, AX- 89929663, AX-89952300 AX-89916572 AX-89946911 ,, AX-89974593, AX-89927158, AX- 89970383, AX-89965404 AX-89955634 AX-89932926,, AX-89941493, AX-89943031 , AX- 89957682, AX-89960611 AX-89950199 AX-89928407, , AX-89962035, AX-89931951 , AX- 89976536, AX-89916801 AX-89929085 AX-89925267,chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663 chr1_6730531 , chr1_27891953, AX_89953259,

chr1_6740481 , chr1_6770611 chr1_7412807, chr1_7360179, chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254 chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044 chr1_10439048, chr1_8142346, chr1_8092208,

chr1_8138683, chr1_8139206 chr1_8139744, chr1_8140789, chr1_8141687, chr1_8154917, chr1_7454708, chr1_7504847 chr1_7505686, chr1_7505817, chr1_8202031 , chr1_8228173, chr1_8309469, chr1_8163977 chr1_27786931 , chr1_8194629, chr1_7505259,

chr1_8474659, chr1_8282602 chr1_8306806, chr1_8341618, chr1_8343786, chr1_8345836, chr1_8350569, chr1_8402403 AX_89962103, chr1_8279302, chr1_8334901 , chr1_7561600, AX_89956272,chr1_7938827, chr1_10810229, chr1_11007071 and chr1_10884171.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

The present invention provides in a further aspect a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the presence of at least one allele conferring IPN resistance ("IPN resistance allele") within the genome (e.g., on chromosome 1) of the genome) of said rainbow trout; and selecting said rainbow trout as having increased resistance when the at least one IPN resistance allele is present.

According to particular embodiments, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to other particular embodiments, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX- 89949832, AX-89916790, AX-89973719, AX-89962023, AX-89921280, AX-89931666, AX-

89921585 AX-89953905 AX-89952945 ,, AX-89934682, AX-89951942, AX-89937020, AX- 89924837 AX-89958601 AX-89923477 ,, AX-89959350, AX-89929482, AX-89937712, AX- 89949602 AX-89925103 AX-89938051 ,, AX-89924174, AX-89936461 , AX-89916703, AX- 89935317 AX-89966423 AX-89933348 ,, AX-89969315, AX-89919958, AX-89968417, AX- 89946851 AX-89976917 AX-89945446 ,, AX-89919457, AX-89973597, AX-89938138, AX- 89971866 AX-89958882 AX-89961273 ,, AX-89944901 , AX-89919465, AX-89959425, AX- 89917102 AX-89959281 AX-89916766 ,, AX-89920507, AX-89957370, AX-89934009, AX- 89929663 AX-89952300 AX-89916572 ,, AX-89946911 , AX-89974593, AX-89927158, AX- 89970383 AX-89965404 AX-89955634 ,, AX-89932926, AX-89941493, AX-89943031 , AX- 8899995577668822, AAXX--8899996600661111 , AAXX--8899995500119999,, AX-89928407, AX-89962035, AX-89931951 , AX- 89976536 AX-89916801 AX-89929085 ,, AX-89925267,,chr1 -7515539, chrl -7108873, chrl- 6864558, chrl -7186663, chrl -6730531 , chrl -27891953, AX-89953259, chrl -6740481 , chrl- 6770611 , chrl-7412807, chrl-7360179, chrl-7411803, chrl-7431445, chrl-7433199, chrl- 7441254, chrl -7441877, chrl -7533570, chrl -6834898, chrl -6730142, chr1_6746052, chrl- 6794061 , chrl-7399212, chrl-7442637, chrl-7358019, chrl-7709828, chrl-7598090, chrl- 7626471 , chrl -7598743, chrl -7670293, chrl -7670561 , chrl -7647634, chrl -7356089, chrl- 8109044, chrl -10439048, chrl-8142346, chrl-8092208, chrl-8138683, chrl-8139206, chrl- 8139744, chrl -8140789, chrl-8141687, chrl-8154917, chrl -7454708, chrl -7504847, chrl- 7505686, chrl-7505817, chrl-8202031 , chrl-8228173, chrl-8309469, chrl-8163977, chrl- 27786931 , chrl -8194629, chrl -7505259, chrl -8474659, chrl -8282602, chrl -8306806, chrl- 8341618, chrl -8343786, chrl -8345836, chrl -8350569, chrl -8402403, AX-89962103, chrl- 8279302, chrl -8334901 , chrl -7561600, AX-89956272,chr1 -7938827, chrl -10810229, chrl- 11007071 and chr1-10884171.

and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

The present invention provides in a further aspect a rainbow trout, such as an isolated rainbow trout, having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a rainbow trout or progeny thereof comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the present invention provides a rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

The present invention provides in a further aspect a rainbow trout or progeny thereof which comprises in its genome at least one allele conferring IPN resistance obtainable by a process comprising the steps of: genotyping the trout, selecting individuals having at least one allele preferably two alleles conferring IPN resistance ("IPN resistance allele"); and mating individuals in such a way that at least one individual within each mated pair has two alleles conferring IPN resistance. According to certain embodiments the rainbow trout or progeny thereof obtained by the process, the at least one IPN resistance allele may be an allele of at least one single nucleotide polymorphism (SNP). Further the at least one SNP is selected from the SNPs listed in Table 1. Further the rainbow trout or progeny thereof may comprise within its genome at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. The present invention provides in a further aspect a population of rainbow trout, such as an isolated population, each individual within the population having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a population of rainbow trouts, each individual within the population comprising within its genome at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the present invention provides a population of rainbow trout, such as an isolated population of rainbow trouts, each individual within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

The present invention provides in a further aspect a rainbow trout population comprising in its genome at least one allele conferring IPN resistance obtainable by a process comprising the steps of: genotyping the trout, selecting individuals having at least one allele preferably two alleles conferring IPN resistance ("IPN resistance allele"); and mating individuals in such a way that at least one individual within each mated pair has two alleles conferring IPN resistance

According to certain embodiments the rainbow trout population obtained by the process, the at least one IPN resistance allele may be an allele of at least one single nucleotide polymorphism (SNP). Further the at least one SNP is selected from the SNPs listed in Table 1. Further the rainbow trout population may comprise within its genome at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

The present invention provides in a further aspect a rainbow trout cell, such as an isolated rainbow trout cell, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele"). According to certain embodiments, the present invention provides a rainbow trout cell, such as an isolated rainbow trout cell, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

The present invention provides in a further aspect a population of rainbow trout cells, such as an isolated population of rainbow trout cells, each individual cell within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance (ΊΡΝ resistance allele").

According to certain embodiments, the present invention provides a population of rainbow trout cells, such as an isolated population of rainbow trout cells, each individual cell within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

The present invention provides in a further aspect a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the present invention provides a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

Present invention provides in a further aspect a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, each individual egg within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele"). According to certain embodiments, the present invention provides a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, each individual egg within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. The present invention provides in a further aspect a nucleic acid molecule, such as an isolated nucleic acid molecule, comprising at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 to 156 and 230 to 299, b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

According to certain embodiments, the present invention provides a nucleic acid molecule, such as an isolated nucleic acid molecule, which comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79, 80, 230, 231 and 232 b) nucleotide sequences derived from any one of SEQ ID NO: 79, 80, 230, 231 and 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

The present invention provides in a further aspect an oligonucleotide, such as an isolated oligonucleotide, comprising at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

Brief description of drawings

Figure 1. "Manhattan plot" from a genome wide association study (GWAS), searching for SNPs associated with resistance to IPN in rainbow trout. SNPs distributed across the rainbow trout genome were tested for their association to IPN-resistance, and consequently, for their ability to predict IPN-resistance. Each data point represent one individual SNP, each SNP having been tested individually. The position of the SNPs (x-axis) corresponds to their position on the female genetic map. The horisontal line indicates the significance level corresponding to a false positive rate (a) of 0.05 when the null hypothesis assumes that none of the SNPs are associated with IPN-resistance, and applying a Bonferroni correction in order to correct for the fact that (approximately) 50,000 SNPs were tested. The Bonferroni correction is highly conservative in this case, since it assumes that all tests (SNPs) are independent, which they are not. On the y-axis, the SNPs are plotted according to the negative of the base-10 logarithm of their p-values. As the figure illustrates, the SNPs most strongly associated with IPN-resistance are located on chromosome 1.

Figure 2. Significance levels of SNPs, located on rainbow trout chromosome 1 , tested for their association to IPN resistance. The SNPs have been ordered according to their position on a genetic map (more precisely, a genetic map based on recombinations occurring in female rainbow trout). cM = centi-Morgan, the standard measure of genetic distance; -loglO(p-value) = the negative of the base-10 logarithms of the SNPs' p-values.

Figure 3. Significance levels of SNPs , obtained from a a study identifying additional SNPs associated with IPN-resistance (Example 3). Novel and already known SNPs on chromosome 1 were tested for their association to IPN-resistance. Values on the x-axis are positions, in basepairs, of SNPs along a DNA reference sequence of rainbow trout chromosome 1 , values on the y-axis are the negative of the base-10 logarithm of p-values.

Detailed description of the invention Unless specifically defined herein, all technical and scientific terms used have the same meaning as commonly understood by a skilled artisan in the fields of genetics, biochemistry, and molecular biology.

All methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, with suitable methods and materials being described herein. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will prevail.

Polymorphisms and IPN resistance allele(s) of the invention

The present inventors have identified a quantitative trait locus (QTL) responsible for a significant fraction of the genetic variation in resistance to IPN in rainbow trout. More specifically, the present inventors have identified polymorphisms, and in particular single nucleotide polymorphisms (SNP), within the genome, more particularly on chromosome 1 , of rainbow trout which are associated with increased resistance of the fish to infectious pancreatic necrosis (IPN). Specific details of single nucleotide polymorphisms of the invention are provided in Table 1 below. The respective nucleotide sequences including the SNP (at position 36) are shown in Table 2.

The polymorphisms of the invention can be present in either of two forms, i.e., the polymorphisms have two alleles. One allele can be characterized as being an allele conferring increased resistance to infectious pancreatic necrosis. This means that a rainbow trout having such allele at the position of a polymorphism detailed herein shows increased resistance to IPN. This allele is herein denoted "IPN resistance allele". The respective IPN resistance allele for each of the single nucleotide polymorphism of the invention is specified in Table 1 below. An IPN resistance allele according to the present invention may therefore be used to predict increased resistance of a rainbow trout to infectious pancreatic necrosis. An IPN resistance allele according to the present invention may also be used to select a rainbow trout having increased resistance to infectious pancreatic necrosis. The other allele can be characterized as being an allele that does not confer increased resistance to infectious pancreatic necrosis. Such allele is herein denoted "non-IPN resistance allele".

Rainbow trout are diploid, in some case triploid organisms, and thus possess at least two copies of the polymorphisms of the invention (one copy to be found on each copy of chromosome 1).

As demonstrated herein, if at least one allele of a polymorphism, and more particularly of a SNP, is the respective IPN resistance allele then the rainbow trout has increased resistance to infectious pancreatic necrosis compared to a rainbow trout wherein both alleles are non-IPN resistance alleles (i.e. such rainbow trout being homozygous for the non-IPN resistance allele). In a great number of cases the resistance to infectious pancreatic necrosis is even further increased if both alleles of a polymorphism, and more particularly of a SNP, are the respective IPN resistance allele (such rainbow trout being homozygous for the IPN resistance allele). Such further increase is, for example, seen for SNPs AX-89929954 (SNP #1), AX- 89918280 (SNP #2), and chrl_7515539 (SNP # 160) which are the most statistically significant SNPs associated with IPN (see Table 3).

A polymorphism of the invention may be any of several polymorphisms associated with increased resistance of a rainbow trout to infectious pancreatic necrosis. Particularly, a polymorphism of the invention is a polymorphism located on chromosome 1 of rainbow trout (following the nomenclature of Palti et al. (2011)), i.e. a polymorphism found to be located on chromosome 1 on the basis of genetic linkage analysis, Fluorescence In Situ Hybridization (FISH) or any other method that assigns DNA polymorphisms to their respective chromosomes.

A polymorphism of the invention may be any polymorphism, including single nucleotide polymorphism, located within any of the rainbow trout genomic sequences listed in the column titled "GenBank contig" in Table 1.

A polymorphism of the invention may be any polymorphism, including single nucleotide polymorphism, located within rainbow trout genomic sequence having GenBank ID FR904293.1.

A polymorphism of the invention may be any polymorphism, including single nucleotide polymorphism, whose genetic distance from SNP AX-89929954 is smaller than or equal to 10 centi-Morgan. Here, the genetic distance is to be estimated on the basis of recombination event occurring in female rainbow trout, and not on recombination events occurring in male rainbow trout. A person who is skilled in the art will know how to estimate genetic map distances, as well as what data material is required for this estimation. A polymorphism of the invention may be any polymorphism, including single nucleotide polymorphism, which is in strong linkage disequilibrium (LD) with SNP AX-89929954. Here, two polymorphisms are defined to be in strong LD if the square of the correlation coefficient between the two loci (r ² , the most commonly used measure of LD) is equal to or larger than 0.5. A person who is skilled in the art will know how to estimate r ² , as well as what data material is required for this estimation.

A polymorphism of the invention may be at least one of the single nucleotide polymorphisms listed in Table 1. Therefore, according to certain embodiments, the at least one SNP of the invention is selected from the SNPs listed in Table 1. Each of the SNPs listed in Table 1 is contemplated as being disclosed individually as part of the present invention. Table 1 : SNPs associated with increased resistance to IPN. A=Adenine, G=Guanine; C=Cytosine, T=Thymine. Affymetix ID is a unique identifier given to each SNP by Affymetrix, the provider of a commercial genotyping assay which incorporates many of the SNPs listed in the table; the Affymerix ID serves as a link to further details pertaining to the SNPs, provided in a file which can be downloaded from http://www.affymetrix.com/estore/. GenBank contig is the name of a GenBank DNA contig (a genome sequence from rainbow trout) wherein the SNP resides, and the position is the position of the SNP within this contig. dbSNP ss-no.(ss#) is the NCBI submission number of the SNP within the NCBI (National Center for Biotechnology Information) Single Nucleotide Polymorphism Database (dbSNP); the respective reference SNP number (rs#) can be retrieved from NCBI.

SNP Name - SEQ Ge nBank contig Position dbSNP ss- IPN Non-IPN # Affymetrix ID ID in No. (ss#) resistance resistance

NO: GenBank allele allele contig

1 AX- 1 FRS 04293.1 1651243 1398298005 C A

89929954

2 AX- 2 FRS 04293.1 1353665 1399389616 G A

89918280

3 AX- 3 FRS 30508.1 112 1958018818 T G

89938309

4 AX- 4 FRS 32837.1 3160 1399779599 T C

89960828

5 AX- 5 FRS 04678.1 635143 1947222023 G T

89930342

6 AX- 6 CU \F01000997 26749 1958018819 G A

89928530 8.1

7 AX- 7 CU \F01000441 12904 1399149964 G A

89949788 3.1

8 AX- 8 CU \F01006448 22746 1398895466 A G

89928131 0.1

9 AX- 9 cct \F01000440 28738 1398503537 A C

89949832 6.1

10 AX- 10 FRS 13799.1 19857 1398404711 T C

89916790

11 AX- 11 FRS 04293.1 1133744 1398781172 A G

89973719

12 AX- 12 FRS 05874.1 180661 1399167685 T G

89962023

13 AX- 13 CD \F01006559 582 1958018820 A G

89921280 5.1

14 AX- 14 FRS 04678.1 34120 1398786470 A G

89931666

15 AX- 15 FRS 04678.1 474477 1958018821 A G

89921585

16 AX- 16 FRS 04293.1 1653144 1958018822 G A

89953905

17 AX- 17 cct \F01000841 13251 1398012752 T C

89952945 2.1

18 AX- 18 ca \F01001346 37152 1399451952 T G

89934682 0.1

19 AX- 19 ca \F01006559 2104 1399313562 T C

89951942 4.1

20 AX- 20 FRS 05950.1 96027 1398530423 A C 89937020

AX- 21 FR907200.1 27594 1398178048 A c

89924837

AX- 22 FR941615.1 565 1399167665 G A

89958601

AX- 23 FR904678.1 226522 1398405156 A C

89923477

AX- 24 FR904678.1 213771 1398405213 T G

89959350

AX- 25 FR915682.1 18182 1958018823 T G

89929482

AX- 26 CCAF01006448 7407 1398895514 A G

89937712 1.1

AX- 27 CCAF01003193 11494 1398103752 G A

89949602 2.1

AX- 28 CCAF01006448 13695 1398895535 A G

89925103 1.1

AX- 29 FR934499.1 1547 1399453527 T C

89938051

AX- 30 FR904977.1 400797 1397830928 A G

89924174

AX- 31 FR904503.1 739897 1397951621 G A

89936461

AX- 32 CCAFOIOOIOOI 3461 1398072822 T G

89916703 0.1

AX- 33 FR950362.1 1884 1398377786 T C

89935317

AX- 34 FR905282.1 358121 1399924230 c T

89966423

AX- 35 FR904343.1 1639174 1397844923 T c

89933348

AX- 36 FR904977.1 54937 1958018824 T c

89969315

AX- 37 - - 1399438973 G A

89919958

AX- 38 CCAF01003192 32394 1398245860 A G

89968417 3.1

AX- 39 CCAF01000446 1967 1958018825 G A

89946851 6.1

AX- 40 FR904293.1 2327239 1398180239 C T

89976917

AX- 41 FR968676.1 1099 1399533056 G A

89945446

AX- 42 FR904381.1 1273596 1398863772 G T

89919457

AX- 43 FR906031.1 36393 1399449790 T c 89973597

AX- 44 FR913799.1 490 1398404618 T C

89938138

AX- 45 CCAF01003192 30454 1958018826 T C

89971866 0.1

AX- 46 CCAF01005294 13953 1399924706 c A

89958882 6.1

AX- 47 CCAF01003191 39607 1399509347 G A

89961273 4.1

AX- 48 CCAF01000540 331 1398303825 A G

89944901 6.1

AX- 49 FR910575.1 22175 1398003168 G T

89919465

AX- 50 CCAF01001165 30908 1399510298 G A

89959425 8.1

AX- 51 CCAF01003190 8080 1398786550 T C

89917102 0.1

AX- 52 CCAF01008683 12600 1399845186 G A

89959281 0.1

AX- 53 CCAF01003461 16962 1398773412 G T

89916766 3.1

AX- 54 - - 1958018827 T A

89920507

AX- 55 HG973520.1 2622978 1399185465 A C

89957370

AX- 56 FR904293.1 2034797 1958018828 G A

89934009

AX- 57 CCAF01000545 22290 1958018829 C A

89929663 2.1

AX- 58 CCAF01005692 2048 1399343172 G T

89952300 1.1

AX- 59 FR904293.1 914413 1958018830 T G

89916572

AX- 60 FR904503.1 1083993 1958018831 T C

89946911

AX- 61 - - 1397844976 c A

89974593

AX- 62 CCAF01007712 16057 1399413068 A C

89927158 1.1

AX- 63 FR906481.1 114723 1958018832 G A

89970383

AX- 64 FR904294.1 287791 1958018833 C T

89965404

AX- 65 FR905454.1 302890 1958018834 T c

89955634

AX- 66 CCAF01000450 3394 1399419631 G T 89932926 0.1

AX- 67 CCAF01000833 11016 1398381496 A G

89941493 0.1

AX- 68 FR915682.1 18027 1399011222 C T

89943031

AX- 69 CCAF01004414 5113 1399499631 A G

89957682 8.1

AX- 70 FR904301.1 1592957 1399172382 T C

89960611

AX- 71 HG973520.1 2957326 1958018835 T C

89950199

AX- 72 FR904678.1 632394 1398105778 T C

89928407

AX- 73 CCAF01000463 13819 1398455543 c T

89962035 3.1

AX- 74 CCAF01001165 6770 1399511408 A c

89931951 8.1

AX- 75 HG973520.1 1007871 1399510949 T G

89976536 3

AX- 76 FR933232.1 298 1397811509 G A

89916801

AX- 77 CCAF01004417 47606 1958018836 G A

89929085 4.1

AX- 78 HG973520.1 723322 1958018837 G T

89925267

chrl_75155 160 FR904293.1 1279149 1947221883 G T 39

chrl_71088 161 CCAF01000447 29772 1947221884 G A 73 2.1

chrl_68645 162 FR904293.1 1930130 1947221885 C T 58

chrl_71866 163 CCAF01000446 16367 1947221886 T c 63 8.1

chrl_67305 164 FR904293.1 2064157 1947221887 T G 31

chrl_27891 165 FR904658.1 512537 1947221888 T C 953

AX- 166 CCAF01000450 540 1947221889 G T

89953259 1.1

chrl_67404 167 FR904293.1 2054207 1947221890 T c 81

chrl_67706 168 FR904293.1 2024077 1947221891 c T 11

chrl_74128 169 FR904293.1 1381881 1947221892 G c 07

chrl_73601 170 FR904293.1 1434509 1947221893 A T 79

171 chrl_74118 171 FR904293.1 1382885 1947221894 G A 03

172 chrl_74314 172 FR904293.1 1363243 1947221895 C T 45

173 chrl_74331 173 FR904293.1 1361489 1947221896 C A 99

174 chrl_74412 174 FR904293.1 1353434 1947221897 A G

54

175 chrl_74418 175 FR904293.1 1352811 1947221898 A C 77

176 chrl_75335 176 FR904293.1 1261118 1947221899 G A 70

177 chrl_68348 177 FR904293.1 1959790 1947221900 T C 98

178 chrl_67301 178 FR904293.1 2064546 1947221901 T C 42

179 chrl_67460 179 FR904293.1 2048636 1947221902 G A 52

180 chrl_67940 180 FR904293.1 2000627 1947221903 G T 61

181 chrl_73992 181 CCAF01000446 4509 1947221904 T c

12 0.1

182 chrl_74426 182 FR904293.1 1352051 1947221905 A G

37

183 chrl_73580 183 FR904293.1 1436669 1947221906 G A 19

184 chrl_77098 184 CCAF01000444 18118 1947221907 A C 28 0.1

185 chrl_75980 185 CCAF01000444 30169 1947221908 T C 90 5.1

186 chrl_76264 186 CCAF01000444 1788 1947221909 G A 71 5.1

187 chrl_75987 187 CCAF01000444 29516 1947221910 T G

43 5.1

188 chrl_76702 188 FR904293.1 1124395 1947221911 A T 93

189 chrl_76705 189 FR904293.1 1124127 1947221912 T G

61

190 chrl_76476 190 CCAF01000444 4148 1947221913 T A 34 4.1

191 chrl_73560 191 FR904293.1 1438599 1947221914 c G

89

192 chrl_81090 192 FR904293.1 685644 1947221915 G A 44

193 chrl_10439 193 CCAF01001345 19790 1947221916 A C 048 5.1

chrl_81423 194 CCAF01000441 25975 1947221917 T C 46 3.1

chrl_80922 195 FR904293.1 702480 1947221918 T G 08

chrl_81386 196 CCAF01000441 29638 1947221919 A T 83 3.1

chrl_81392 197 CCAF01000441 29115 1947221920 G T 06 3.1

chrl_81397 198 CCAF01000441 28577 1947221921 G c 44 3.1

chrl_81407 199 CCAF01000441 27532 1947221922 T A 89 3.1

chrl_81416 200 CCAF01000441 26634 1947221923 A G 87 3.1

chrl_81549 201 CCAF01000441 13404 1947221924 G T 17 3.1

chrl_74547 202 FR904293.1 1339980 1947221925 T c 08

chrl_75048 203 FR904293.1 1289841 1947221926 T c 47

chrl_75056 204 FR904293.1 1289002 1947221927 T A 86

chrl_75058 205 FR904293.1 1288871 1947221928 A T 17

chrl_82020 206 CCAF01000441 32050 1947221929 T G 31 1.1

chrl_82281 207 CCAF01000441 5908 1947221930 A G 73 1.1

chrl_83094 208 CCAF01000440 46564 1947221931 T C 69 6.1

chrl_81639 209 CCAF01000441 4344 1947221932 A C 77 3.1

chrl_27786 210 FR904658.1 617559 1947221933 C G 931

chrl_81946 211 CCAF01000441 39452 1947221934 A G 29 1.1

chrl_75052 212 FR904293.1 1289429 1947221935 G A 59

chrl_84746 213 FR904293.1 320029 1947221936 C T 59

chrl_82826 214 FR904293.1 512086 1947221937 T G 02

chrl_83068 215 CCAF01000440 49227 1947221938 T A 06 6.1

chrl_83416 216 CCAF01000440 14415 1947221939 A G 217 chrl_83437 217 CCAF01000440 12247 1947221940 C T 86 6.1

218 chrl_83458 218 CCAF01000440 10197 1947221941 T c 36 6.1

219 chrl_83505 219 CCAF01000440 5464 1947221942 A G 69 6.1

220 chrl_84024 220 FR904293.1 392285 1947221943 G A 03

221 AX- 221 FR904678.1 32488 1947221944 A G

89962103

222 chrl_82793 222 FR904293.1 515386 1947221945 A G 02

223 chrl_83349 223 CCAF01000440 21132 1947221946 A G 01 6.1

224 chrl_75616 224 CCAF01000444 1915 1947221947 A G 00 9.1

225 AX- 225 FR904678.1 215682 1947221948 T C

89956272

226 chrl_79388 226 FR904293.1 855861 1947221949 A G 27

227 chrl_10810 227 HG973520.1 3299862 1947221950 T C 229

228 chrl_11007 228 HG973520.1 3103020 1947221951 G T 071

229 chrl_10884 229 HG973520.1 3225920 1947221952 C T 171

The NCBI dbSNP ss-no. in Table 1 above indicates a reference sequence and a position of the SNP within that reference sequence. Those skilled in the art may easily identify the reference sequence and the position of the SNP using the dbSNP ss submission number.

Table 2: Nucleotide sequence containing SNP. [IPN resistance allele/ Non-IPN resistance allel] indicates the polymorphic site including the allele variants.

89918280 CACAATATACATA

AX- 3 I CC I I G I A I CGCAGAAC I 1 1 I AAA I G I 1 I GA T G

89938309 ATCC [T/ G JTCTTG ATGTT ATGTG ATTG GTG G

ATTCAAATAAGT

AX- 4 GATGCAGGGTTGCACAGAACGTTGATGCC T C

89960828 AGT AGT [T/ C] ATG G C ATG G CTCTC AGTAC A

AACTCATACTGAGTG

AX- 5 G A ATG G C A ATT A ATTTC ATG CTG A ACT A ACT G T

89930342 GAAT[G/T]AAGAAAGGAAATGACCCCAACC

CTG GTTG C ATACT

AX- 6 CTC AC ATTCTTC ACCTT ATTG G AATG C ATG G G A

89928530 AAAG[G/A]CGCCATGGGAAGCTCACTGCG

GTTTCGAACCTACG

AX- 7 AG 1 CAAAACCA 1 GAAAAAGC I GA I 1 1 1 AGA G A

89949788 ATGAC[G/A]TTTGTAACACTCTCCATGATGA

CGGTTAATAGAAG

AX- 8 CGTGTCAATATTGGAACGACTAAATACGTG A G

89928131 AATCT[A/G]TCAGGACGGGTGAACTGAGCA

CAAATCTAGATCAT

AX- 9 AGTCCCTCCCTTAGTGGTATCAAACCATAAC A C

89949832 TAAT[A/ C] ATTTCTTCACAAATTATGG AACA

AAAATAAATCCC

AX- 10 AAACGGAGTGCCGAAGACTCTGAACTCACA T C

89916790 GACTC[T/C]CTGCCGAAAAAAACGAAAGTA

ATGTCCTCAACTCT

AX- 11 TGTAAATTCATAAGTAAAGAGAACACCTGT A G

89973719 TTAAG [A/ G] AG AGCACATTATGCAAAACCT

CATATGGAAAACGT

AX- 12 G CGTG G AC AC ATG AG G G ACG CTGTG CTCC T G

89962023 CTGTGT[T/G]CTCCCAGCAACACGAGGTAA

TTCTGCAGAACAACC

AX- 13 AAAGGAAGAAGAATGGTCAGGAGAGGTAA A G

89921280 GGTTGG[A/G]AGGAATTATGC I 1 1 I CAATG

ATCTG GTCCTG C A AG

AX- 14 G C AATA AT AACC ATTG A A AA ATATG CTTTG A G

89931666 GGAAT[A/G]TCTCCATTCTTTCCCTAGTCCA

ATATGTG 1 I U 1 1

AX- 15 AG G G G CG GTTAG AC AC ATG G GTGTG G CTA A G

89921585 GAAATG[A/G]GGGTTGGTGACACCCACTCC

TTGGCACTCGATGAT

AX- 16 CAGCCAGCTTTCGAGTAGCAGGGAGAGGA G A

89953905 CAGTAA[G/A]TATTGACACAGTGTAAGCAC

TAG G C AG C ACTAG G C

AX- 17 CAATACAATGAGGTGTAAATGGTTGAATTC T C

89952945 ACTGT[T/C]GGATAAAGACTGCAGGACAGG

CCAGTAAAACATTT

AX- 18 GTCCTCTATGCCTCCTATGAGTTCTTCGAGG T G

89934682 CCAT[T/G]TGCAGCGTGAGTAGCTGCCTGG

ACCCCATGCTGTA

AX- 19 A l 1 AC 1 1 1 I GAA I CACAGU 1 AGCA 1 A 1 AG T C

CCCT[T/C]GCTATAGATACAATTCATACATC 89951942 AAGATAATGACT

AX- 20 TATAGTAGATAATTGATTCAAATGGCAGTT A c

89937020 GTATT[A/C]CAU 1 1 I G I 1 1 1 I U 1 I ACAGTG

GTC AGTG CTATT

AX- 21 CACACAAGGTAGATACACCTGCAGAGCATG A c

89924837 TTTCG [A/C] AAATTAATAAGGTAAGTCTG A

ATACCAAATACTGA

AX- 22 CTGTTGTTGGCCAGATTACCATCAGTGCAG G A

89958601 TTG G A [G/ A] TTC AG G CCTTATCTCTG CCTC A

CACAACATCATCT

AX- 23 ATG G GTCGTGTTC ATC AG G C AG AA AA ATG A A C

89923477 CGTAT[A/C]ATGCCCTAATGAACATGACCCT

GGCATTACCTAGA

AX- 24 G AACCCCT AG G CT AG ATGTTC AACCTG G CC T G

89959350 TCAGG [T/G] CAATTCTG AAG ATTTGGTACG

C A AATATGTTCG CC

AX- 25 CTGTTC ATTCTGTCTGTTTC AGTTG GTG CTC T G

89929482 TGGA[T/G]AGGAGAAAAGCCCACCTGCTGT

GAGCCCCTTATTG

AX- 26 TCAGCGTCCTACAGCTAAACCATACGATGA A G

89937712 AATTA[A/G] AACAATAAATTCAGTGTG ATA

TCCGTTATGGACCA

AX- 27 AG GTG G C AG G A AA AAG AATACCTCC AG CC G A

89949602 AATCGC[G/A]TGACATCTGTCCATTCAAGCT

GCAGCGAATCTGAC

AX- 28 CACGTCTCTCCAAAACGTTTCCACTTACTTT A G

89925103 CCCA[A/G]GAAGCCTTTCCCGTTGGGCTGC

TCCTTCAGCCACT

AX- 29 TCCATAGTGGCTACCAGCCCACATACGCAC T C

89938051 TGACA[T/C]AATCACAGACAGACTGACAGA

CAGCAGCTTGATCA

AX- 30 ATTTG AG A ATC AG ATG C AG A AG AG C A AG G A G

89924174 1 1 1 1 CC[A/G]AGCCTGTGGCTATCCTCCATA

CGATTCAACCACCT

AX- 31 TACCGTACAGCCCTGCTAAAGGAGGAAAAC G A

89936461 AAG G G [G/ A] C ATG ATG GTATGTCTTG G GG C

TTCCTCAGGGCCCA

AX- 32 AAACAACTCTTCAAGATGATGAGTAACAAC T G

89916703 CAAAG [T/G] CAG AAATTCCCCTTAAAATAA

CTGAAAGGAAAAAG

AX- 33 GTGTTTGTAAACTGGTAATTGAAATTGTACT T C

89935317 G ATA[T/ C]CAG ATG ATGTAG AAATAAATGT

G 1 1 1 1 GATGTAGG

AX- 34 TAC AG AG G AG CTATG G G CTTC ATCCTC ATG c T

89966423 TACGA[C/T]ATCTGCAATGAAGAGTCCTTCA

ACGCTGTGCAGGA

AX- 35 G GCCCC ATTATTTTG G CTTCTTGTGT AG CAG T c

89933348 ACTT [T/ C] GT AGTGTGTAAG G AAG CCTTG CT

G GTCTTG C AC AG

AX- 36 TCTGCTGAGCTCCCCTGAAAGACTGTGAGT T c

CACAA[T/C]GGTCATTTATTTACCTTCTCTGC 89969315 TTCACTCAACAC

AX- 37 ACTATTCCTCACATGCTACAGAATAGCTAG G A

89919958 G GTA A [G/ A] AG G AT AGTA AC ATTAACC ATA

ACACCAAAGCTAAT

AX- 38 TCCAGTCCCACTAGTTTGGCTTTGAAGTCGC A G

89968417 GGAT[A/G]GTAGACTCGCTCTTGTATCTCTT

CTCAGTCAGGTC

AX- 39 GTAAAGGCTAGCAGACCCTGGGAACATTCC G A

89946851 CCTG C [ G/ A] CTC AG CCTCTCTG CC ATG G AG

GAAATGCTAAAAGT

AX- 40 1 1 1 I GAACAGCAU I A I U U 1 1 1 CCAGA C T

89976917 GGGG[C/T]ATATCACAGAGCATGACCAAAA

AGTTAGCCAGCTA

AX- 41 AAG I I GACU U I A I GA I 1 1 I A I I A I I GG I 1 G A

89945446 TGTG[G/A]TGCAAGATGTTCTGTCCAGGTT

TCAACTTATAGCC

AX- 42 ACCACCACACCTGCCTGAGTCATGTAAGAA G T

89919457 GATTA[G/T]GCATGGTGGATGGAGGTGGG

AAGACAATTAATGGT

AX- 43 TGGTCGTCTGAGCCCTATGTAGTGAATTCA T c

89973597 AACTT [T/ C] CTTGTCT AAG CC AAGTATC A AC

CTGCAAACCCAAG

AX- 44 TCCCCTTCTGTGTGCTCAAGGTGTGAATATT T c

89938138 TTAT[T/C]GTT AACTT ACTTCACTCGTGTCCT

GCAGTTAGATG

AX- 45 AGCAGGCAGGTTGAGACAAGCCTGCAGGG T c

89971866 CCA AT A [T/ C] CTGTC ACTATC ATA ACTC A AG

CCAACAATACCCAA

AX- 46 CTTGCTTGCCATCACCCGTCTGGTCCAAGG c A

89958882 GACTA[C/A] GGTCAATATAACCTCCAATCTT

AGTAACCTACCTC

AX- 47 GCAGACACCCTGGGCAGCGTTGGAGTGAT G A

89961273 CATCTC[G/A]GCCATCCTGATGCAGAAGTA

TGACCTGATGATCGC

AX- 48 AACTG G G CTAA A ACG ATG GGACGGTGTGC A G

89944901 GAAAAC[A/G]AACTAACCCTAACCAGAAAA

TTGTATG CTTTGTTT

AX- 49 ACCACCTTCACATTAACCTTCTCCATGACAA G T

89919465 AACA[G/T]CCCCAAGCCTGAACAGCCCCTA

GCCCCTTCCACTA

AX- 50 GAAGACACAAACTCAACAAGAGCACAACA G A

89959425 AC AC AG [G/A] CTTA AG GT ACTG C AATTCCT

GCTTA I 1 1 1 CAT AAA

AX- 51 AAATGAAAAGCGAGAAAGGACGGAGGTAT T C

89917102 TTTAAA[T/C]ATATTTACCATAGTACTCACC

GAAGGCTGCAGCCA

AX- 52 GAAA I I GCCCC I I GA I 1 1 I G I CAG I 1 I AGCG G A

89959281 ATCA[G/A]TATACACAAAATAATTAACTAAA

GGAACAACCATA

AX- 53 AA ACC AC ATG GTCTTCCTG C A ACTTTGTG CC G T

AAAT[G/T]AGTAGTTTCACAATGAACGTTGT 89916766 GAGGTCTGCAGC

AX- 54 AGACACACAGCAGACTAGACTGAGGATGT T A

89920507 G AACC A [T/ AJTCCTCC ACTTA ATG C AA ATG C

AGGGACACATTCAG

AX- 55 CTATTCCTG CTT ACCGTAGTTG AACTG G CTG A C

89957370 TTGG[A/C]TTTCTCACAGTTGATGATGTTGA

AGCGATAGGGCA

AX- 56 G GTGTA AGTAC AG ACTCTTTG AA AG C ATG C G A

89934009 AA ATA [G/ A] A AGTA AAG AC ACTGTC ATTCC

TTTAAATGTTCTTG

AX- 57 CTTCTTTATTTGCTATGATTATTACTTAATAG C A

89929663 TGC [C/A] G ATTGTATTTGTC ATCCGTATTG A

CTGCAGAACTA

AX- 58 ATTGTTCAAGGACATTATGCTTGTCCTACAT G T

89952300 ATTG [G/T] CAATTTG ATGTCGTTCTTTAACA

TTTATAATTGAT

AX- 59 AAAACTTCTTAAGGGACAAGAAGGAAGTT T G

89916572 GAAGTT[T/G]GGGGTGGGCTAGGAAGATA

AAGAGTTGGGGGTGTG

AX- 60 ACCAACACAGAGATGAGACGTGCCGAGCG T C

89946911 CAAGGC[T/C]ACCAAGAAGAAGCTCCCGCT

GAAACGAGAGATGGA

AX- 61 TTAATCTAACTCACTCTCCATAACATCACAG c A

89974593 AAGT[C/A]GATGTATTCGATTATAACAAGCT

CAGGGCTGTCAT

AX- 62 CCCTTTACCTAGAATGGTCTGCAGCGTGAT A C

89927158 GTCAA[A/C]GTGGTTA 1 1 1 1 GTCCATTGTTG

CCAGTGATAAGCC

AX- 63 TGCAGAATGGACAACTGAAGAGAGATATG G A

89970383 TCGCAC[G/A]TGAGGGAAACAACTCCGTGT

CTAGGCCTTCTGAAG

AX- 64 GTTAGTG A AAG CC ATTTC AG G GTA A ACCCT C T

89965404 CCAGG[C/T]CGTCCAATGTACCATAGAAGC

AAAACAATGATAAT

AX- 65 CCCATCTGTCAGAACCTTGCCCACAGCTGTT T c

89955634 TCCC[T/C]ACTCAATGAAAACAAGCTAACAT

CCTGCAGGTTGA

AX- 66 GGAATATTCGAACGGCTTGTTGTCCAATGA G T

89932926 GTCGG[G/T]GGCCTTACCACCACAAACCCC

AAGGCCTGAGGCAG

AX- 67 TTAAGAGAGTCACAAACATGAAAAACTGTG A G

89941493 ATAGT[A/G]CAAAGAAGATGAACGATAGG

CTTGTGGATAGATTA

AX- 68 TTT ATTTC AG C ATTT AG CCC A ATCCTG CT AA C T

89943031 GAAC[C/T]GTCAGTTAATCACTAATTAGGA

GAATATCAATAAA

AX- 69 CTCGAAGTAAGAAATGAAGCTGCAGGTCTG A G

89957682 CAGGC[A/G]GAGTGCTGTCAGTGGAATATA

ATACCCTTAATAGA

AX- 70 GA 1 AAGGA 1 GCAACAGA 1 1 I A I 1 M AG I 1 1 1 T C

AGAT[T/C]ATGCTTTCAGACTGATTTCGGCT 89960611 CTTAAAAAGATA

71 AX- 71 TCTCTGTTCAATATTTAGAATAAAAAGCTGA T c

89950199 CAAA[T/C]GTCACGTAATGGACTGGAAACA

GCAGACACATGGC

72 AX- 72 CTATAG GTG G ATG ATATG ATATG GTTG C AG T c

89928407 CTAGA[T/C]AGTGACAGCTGCCTACCTTGTA

AGTACCACCTCGA

73 AX- 73 GCGTTTCCAGTAAAACGACGTCCCCCTTCG c T

89962035 CCCTA[C/T]ATTTAATGAGCACGTAGTCTAG

A l 1 1 1 1 GTTTAAC

74 AX- 74 GCAGG I 1 1 1 1 GCAGAAA I AG 1 I GU AA I A A c

89931951 AAGTT[A/C]TTCTGTAACCATTGTATAAGCA

GGGTCACCATGAC

75 AX- 75 TTTCTCTTAATGCATCATCCTTGTGCGAAAT T G

89976536 CATG [T/GJTAAGTACACACCGTTAAAGTTA

GGTGCTTTGTTAC

76 AX- 76 AAACTAATGAAAAACACAAGAGTGCCTGCA G A

89916801 GTAAC [G/A] CTGTACTAACGCTGTACTAAC

AGT AC ACTCTC AG G

77 AX- 77 CTG C AG C AG ATG G A ACTATATCTCTAGTG G G A

89929085 CTGTG[G/A]GTGGAGGAGGAGATGTGGTG

AAGACTGAGCAGACA

78 AX- 78 CAGAAAGGAAAAATGTGTCAAAGTTCTAGA G T

89925267 TAGTG[G/T]GTGGAAAGACTCAAACAATGC

AGTTTGGAATGAAG

160 chrl_ 160 A I AA I 1 1 AC 1 1 1 I AAGA I 1 I C I GACCGGCC I G T 7515539 TGTT[G/T] 1 1 1 1 1 G CTTATGTG CC ATTATTG C

CGGCTAGACCA

161 chrl_7108 161 TAAAGAACAAGAAAACAGTACACATGCATT G A 873 AACTC[G/A]CCATGTTGGTGTTGGAGAACT

CGATACAGAGACAG

162 chrl_6864 162 CTCATGGAGAGGCATATCTTGTCCTATCCCC C T 558 ATAA[C/T]GGCCACCTGGTAATGAGCCGTG

AAACACTAGAGCC

163 chrl_7186 163 CCATTTAGATTATTCAACGGTGAAACATACA T c 663 CATC[T/C]TGTAAATTACTCTCAGGTAACCG

GACTTGATTTGT

164 chrl_6730 164 GTTTGTAGCCCCATCTCACTGGCTTCTTGAA T G 531 AGTA[T/G] AATTTATTATG ATTGTTTAATTA

TAATAGTGAATA

165 chrl_2789 165 ATTTC ATGT ATTG G CC AAC A AACG A ACTTGT T C 1953 AG G C [T/CJTACGTG CC ATG GTTGTC AC ATTT

TAATAAAACATG

166 AX- 166 C AC AGTTATAG C AAC ACTTA AGTAG A ATG G G T

89953259 AAATG [G/T]TTTCATTTAA 1 1 1 1 AGTCAGTT

GGCATTCAGTTGA

167 chrl_6740 167 AGTCTGCAGACCCTACCCAGCCTGGTCTCC T c 481 C AGG C [T/C] GTC AC AC AG C AG C AC AG G G AC TTTCTGGATGGCTT

168 chrl_6770 168 ATTTCATGAACCTACACAAATCCAGTGTCAG C T 611 GAAA[C/T]CCTTATAAAU 1 1 1 GCTCATGGG

TGTGGAGATGTG

169 chrl_7412 169 ATAGGGCCAAGACAGAAGACAGACATGAA G c 807 AGTCCT[G/C]CTGACGGGCAAAACATACAG

ACCCCACCTGGAGAA

170 chrl_7360 170 TTC AGTTC AGTC A AACTG GCTGTCGTTG G C A T 179 G CTG C [ A/T] G G ACT AG CTG G C AC ATTC A AT

GGGAATCGTTTGTC

171 chrl_7411 171 AAAGGTCTTGATGGATATTGTGAGTTATCG G A 803 GTGTC[G/A]TAAGAAATCGCCACCTCGCAA

CCCATGCGACCCCA

172 chrl_7431 172 ACTCCAAAGCCACCACAGTCTCCTCCAGCCA C T 445 TGGT[C/T]CATCCCTCCAGTAGCCCAACCAA

TTACCAAACAGA

173 chrl_7433 173 ACATGCGACACATGGACAGATTAATTAGAT C A 199 TG G GT[C/ A] AC AAC AC ATTGTATTG C AA AC

ATGTGAAGCTATAA

174 chrl_7441 174 CTCTCATTCCTCCTATTCATATGTATATACAC A G 254 TG G [ A/G ] CT AGTT AGTGTT ATG GTTGTT ATT

CACTGGCAATA

175 chrl_7441 175 CAAACAACCCTGGAAGTCAAATCAAGAGGC A C 877 AAGGC[A/C]CTGTGTTTCCTTGAAAGCCAG

AG CTGTTTGTGTCC

176 chrl_7533 176 GGACCAGTGTTTCATATCCTGTGGTGAGCT G A 570 TCACA[G/A]GTCAAATGTGATTAATCATAAT

TGAAATCAAATTA

177 chrl_6834 177 A AG AG A AT ATTTG G A AT AG C ATTG G C A A AT T C 898 AC ACC [T/C] AGTG G G GTG G AG CTG CGTC AG

TAGTG C AC AG C AC A

178 chrl_6730 178 GAAAATACTGTTACTGTAGAATATAATAGT T C 142 CATAA[T/C]CCTCTGATCCAAATAATTATGC

ATAGGTAGTGTTC

179 chrl_6746 179 G A 052 CTCAACATAATTAAATACCAACACCAATGTA

AATC[G/A]TTCTTCAGAAACATTGAGTAAAT

ATACCTTTACTA chrl_6794 180 AG A AAG C AG G AAGTTC AG G G GTC AACTG G G T 061 G C AAG G [G/T] C A ATA AG AG G C ATTTCTA AC

CGTGATCCTGAACCC chrl_7399 181 CG A ATC A AG CC A AATA AAG CG G CC AC ATCT T c 212 CAAAT[T/C]TGGTCAGCCTTTGGAGGAGAA

CGATAAACGGACTT chrl_7442 182 CCGCAGATGACATCACTACACTGCCTGATA A G 637 CAGCA[A/G]AGCGTGCTTTGCGGTGAGTTA

AAAAAATACCATGG chrl_7358 183 C ATG AG CTC A AG C AC ATCTG CTTCTTTCTTC G A 019 AG G G [G/ A] A AA AA A ATAC AG G G ATCCCC A

ACTGCATTTGATTT

184 TGTAGTCTAATAATGAGGGGATTAGTGAAA A C chrl_7709 ACTTT[A/C]AGTCAGACCTTTGTCTTTAAAA

828 CAATAGATTTCTG

185 ATGTTG G C ATTGTAGGTGTC ATAG C A ACC A T C chrl_7598 GGACC[T/C]AATCCCTGTACCAAACATGTG

090 ATTAAAAACATATA

186 TTACCCGGCTAAGGAGCGCTTTCTTCGCACT G A chrl_7626 TGGA[G/A]TATAATGAAACCTCAAACTGTC

471 TC ATTT A AT ATG C

187 TTG G G AC AGTTT AACGTTC ACCTC AG G A AT T G chrl_7598 CCACA[T/G]CCTTTCA I 1 1 1 AAG 1 1 I A I 1 1 I A

743 CTTGGCAGAGCA

188 CAACAATGCAACAGAAATTAGTGTGTGACA A T chrl_7670 AAAAT[A/T]TGAACGGCTGCTTTGAAAATT

293 ATTATCAAGGCAGT

189 GTGCCCTTATCTTACCGCTGATCAGTGGCA T G chrl_7670 ACCCA[T/G]TAG 1 1 1 1 1 ACTAACTGAAAACA

561 CCATTGACATTCT

190 ACTGCCTGGTTATGACACCTGAACCCTACA T A chrl_7647 GAGAG[T/A]GTGGGG CT AT AGTT AA AATTT

634 ACTCCCCTAAGGTT

191 AGGATCCCATCCCATAATGAATGGGTCTAG c G chrl_7356 CTATA[C/G] ATTT ATG ACCAGTTG 1 1 1 1 CCG

089 GGTTTATGACCTC

192 TAAATAGCTTTGTGGAGTAGATTATGAATT G A chrl_8109 GTATT[G/ A] ATG CC AT ATCC ACTGTTCTG C A

044 ATGACTCTCCATA

193 ACCCTTTGATGTGATTTGCTTCTGAGAAACA A C chrl_1043 TCAT[A/C]ATTTATTGATGCTTCCATTAAAG

9048 TAGCATAGATGT

194 AA ATC AC AGTG C AGTTATC AC AA AAC ATTA T C chrl_8142 TCTTC[T/C]GTGTTGTAGCCTAACTAGACTA

346 TAC AG CTGT AA A A

chrl_8092 195 AAGTTTGTACCCCAAATTTCCATTTATGGAA T G 208 TGGA[T/G]AGTTTAATTGCA 1 1 1 1 I GGATTG ATACAGTAACCA

196 196 GGGTTATGTATAAATCGATGTAATTATTATT A T chrl_8138 TTTG [A/TJTTTAAAAGGTATAATATTGTATA

683 ACATTGTAATAA

197 197 G ATG G C ATTC ACT ATCCTTTA AC ACC AC ATC G T chrl_8139 GTAG [G/T]TG ATGTG G C AC AAA AG C AGTG C

206 TTAAAAAATAAAT

198 198 CACACAAAAACTATTAGCCCATCGTTGGTAT G c chrl_8139 AGTG[G/C]CAAAATG 1 1 1 I AAATGTCAGCA

744 ATCAAATTCAAGA

199 199 TCAGTGACGGCTGTGAACATAAAGGGTATA T A chrl_8140 GTTG C [T/ AJTTACTG GTCC ACGTTC AA AA AC

789 CAGAGTTGAGATT

200 200 ACCAA 1 1 1 1 A 1 AG 1 ACACAG AAAAA 1 A 1 C 1 A G chrl_8141 AGAT[A/G]TGATTCTCACCAAAGAGACCAT

687 A l 1 1 1 GAAATAGT

201 201 CTCGATCTTCTCAAGTCAAGTGGCCAATTAA G T chrl_8154 ATAT[G/T]AATCTAAACACAACAATCCAGTT

917 TGACTAGTTGTT

202 202 AG G AC AC ACG CTG G GTG AG C A AC AC AC AT T c chrl_7454 CCCCAG[T/C]CCCCCTGAGAAATCAGGCTTC

708 TTAC A AG GTTATA A

203 203 GGGGCCTTTGTCACACAGAAAGAGATGAC T c chrl_7504 ATCAGT[T/C]GCAAGAGAGGCCATCAGTGT

847 GTTCAAGGACTGGAA

204 204 G G A AGTCT AG G GTG G A AG G G AG G AC ATTG T A chrl_7505 TG CG G G [T/A] CGTTCC ACC A ATTG AGTACCT

686 TTTC AG C AGTC ACT

205 205 CATCTCAAAAATAAGTTAAATAAATAAATTA A T chrl_7505 CTAT[A/T]GTAAGTGCCAAATAAAGTAACA

817 GGGTTGAA I I M A

206 206 TGTAGATTAAACAACAAAGTCAGATTATCT T G chrl_8202 GAGCC[T/G]TGTGTGCCCCAACTTCAACAA

031 GGAGACCGTATTGT

207 207 TTATCAATAATTATAATCAATGACTCACATC A G chrl_8228 TTGA[A/G]TATCTACAGATGTAGACTTGTG

173 ATTGAGCTACTGT

208 208 AACGACCTCATACTGGGCCGGAGGATCTCC T C chrl_8309 TTCTA [T/C] G AG CTC AG G G G G G A AATAGG G

469 TGTGGGAACTTCTC

209 209 AACAATACACTCTTGTCACTTGCCTTTACTG A C chrl_8163 AGAA[A/C]GTCGTGGTGGACACCAGATTCC

977 CATGTGAAGGAGA

210 210 AAGTC ATTG ACCTTG CTG CCTTG GTCGTCCC C G chrl_2778 TCTC[C/G]GTGGTGGTGAACACGCGCGTTT

6931 TGGACTCCTCTGT

211 211 TGCTGAAGCTGGACAAGGAGAACGCCGTC A G chrl_8194 GACCGC[A/G]CAGAGCAGGCTGAGACCGA

629 CAAGAAGGCAGCAGAG 212 212 GATCAGCTGGAGAACATCTACAAGGACAAT G A chrl_7505 CCCCT[G/A]GTGAATCTCCATTATGCCACTT

259 TTAG CC A AC AACT

213 213 TATGAGCAGCTGAAAAACAATTAAAATATT C T chrl_8474 11111 [C/TJCCTGTGTTTGAGGAAGGGGAA

659 GAGTGGACCCAGGG

214 214 ATATTTCCTTCCTCACATCCCTGGCAATTAT T G chrl_8282 AGTA [T/ G ] A ATCTG AG CC ATA AC A AC ATG A

602 CCTGGATAGATGA

215 215 AA ATA ATG G C ATG C ATTTG ATATTAGTGTA T A chrl_8306 TGTTT [T/ A] A A AAC ATTAC AG GTTAC AG AG

806 AAACTATAAGGAAT

216 216 ACAI ICAGGIAAIGGIACAI 11 IGI 1 IAAI 1 A G chrl_8341 AA AC [ A/G ] ACTTTCC AT AGTTTGTG G AG AA

618 AG G GTGTGTACTC

217 217 GGI 11 IAIGU IGAACAI ICAI 11 IGGAAI 1 C T chrl_8343 TCCA[C/T]GACTGTCTCTAGCTGCTTTAATC

786 TTCTTTCAAGGA

218 218 TAGATGTTGAGTATATCTAACACTTCCAGAA T c chrl_8345 CATC [T/C] AGTTTAGTG CTG ATGTGTC ATTT

836 CTGTTCCAGGCA

219 219 CAATGGAACGCCTCCTCTTTCTAATAACCCT A G chrl_8350 AGTA[A/G]AGTGCCGTCAAATGTCGTTGAC

569 AGATTTGAGTCTT

220 220 AAAGGATATATTGATGAATATGACCTATGT G A chrl_8402 ACTGT[G/A] CTACTTAAATTCAG ATAGCTGT

403 TTGTTCATGTGTG

221 221 GCIAIAI IAAI ICAGAAAIGCCAI 11 ICIGI A G

AX- CATG[A/G]GGGAAAATATAG 111 IACACTT

89962103 ATCCCAGAAACAC

222 222 TGTACATTGTAAAGATGGAGAAATATTGAC A G chrl_8279 AAAAA[A/G]ATGTCGTATAGGCTACTGTAT

302 TACTTGATATGTTT

223 223 11 IAACCCAGCAI IGIGACACAI 111 IAI IA A G chrl_8334 AATC[A/G]AGGATGTGCAGTTTG 111 IATCC

901 ACTTCATTAATA

224 224 AATTTGACCAATTTGTCTTCATACATTTCAG A G chrl_7561 ATA A [ A/G ] CTC ACG ATTCTTA AGTC ATGTTG

600 TAI 111 IACCGA

225 225 CCTG ACTG A AAG C AG G G C AC A AT ATC AG G T C

AX- AAGTTG[T/C]ATTAGCCACCATCATGGCGG

89956272 TGGAAAATTGTGCTT

226 226 GTTATGGTGAAAGAGAAGCTCAGTTACGG A G chrl_7938 AG C AC A[ A/G ] C AG C AA ATCCTC A AC AAG CC

827 AAACCTGCAAGACAA

227 227 GACATCTGGAGAGCTAAGGAAACAACCAA T C chrl_1081 G CCTGT[T/C] G G A ACTTCTATTG G GTGTCTC

0229 TG CT AG C AGTCC AA

228 228 CAATAACTAGAAAAATACATTTCCTAAAGA G T chrl_1100 AA ATG [G/T] GTGTGCTTG CTTG CTTGTCTTA

7071 AAGTATTTATGTT 229 229 TATC AG G AC AAG CTG G A ACTAG ATAG CTG G C T chrl_1088 TTATG[C/T]AACGTTAACTATTGGGATCAGA

4171 AACTGAACTAGCT

The column in Table 2 labeled "Nucleotide sequence containing SNP" provides a reference nucleotide sequence for identification of the SNP within the genome of a rainbow trout. The sequences SEQ ID NO: 1 to 78 and SEQ ID NOs: 160 to 229 are each polymorphic sequences including a polymorphic site. A "polymorphic sequence" is a nucleotide sequence including a polymorphic site at which a SNP occurs. All or only part of the polymorphic sequence flanking the polymorphic site can be used by the skilled practitioner to identify the SNP within the genome of a rainbow trout.

According to particular embodiments, the at least one SNP of the invention is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-

89930342 AX-89928530 AX-89949788,, AX-89928131 , AX-89949832, AX-89916790, AX- 89973719 AX-89962023 AX-89921280,, AX-89931666, AX-89921585, AX-89953905, AX- 89952945 AX-89934682 AX-89951942,, AX-89937020, AX-89924837, AX-89958601 , AX- 89923477 AX-89959350 AX-89929482,, AX-89937712, AX-89949602, AX-89925103, AX- 89938051 AX-89924174 AX-89936461 ,, AX-89916703, AX-89935317, AX-89966423, AX- 89933348 AX-89969315 AX-89919958,, AX-89968417, AX-89946851 , AX-89976917, AX- 89945446 AX-89919457 AX-89973597,, AX-89938138, AX-89971866, AX-89958882, AX- 89961273 AX-89944901 AX-89919465,, AX-89959425, AX-89917102, AX-89959281 , AX- 89916766 AX-89920507 AX-89957370,, AX-89934009, AX-89929663, AX-89952300, AX- 89916572 AX-89946911 AX-89974593,, AX-89927158, AX-89970383, AX-89965404, AX- 89955634 AX-89932926 AX-89941493,, AX-89943031 , AX-89957682, AX-89960611 , AX- 89950199 AX-89928407 AX-89962035, , AX-89931951 , AX-89976536, AX-89916801 , AX- 89929085 AX-89925267, chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179 , chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570 , chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637 , chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293 , chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044,chr1_10439048, chr1_8142346 , chr1_8092208, chr1_8138683, chr1_8139206, chr1_8139744, chr1_8140789, chr1_8141687 , chr1_8154917, chr1_7454708, chr1_7504847, chr1_7505686, chr1_7505817, chr1_8202031 , chr1_8228173, chr1_8309469, chr1_8163977, chr1_27786931 ,chr1_8194629, chr1_7505259 , chr1_8474659, chr1_8282602, chr1_8306806, chr1_8341618, chr1_8343786, chr1_8345836 , chr1_8350569, chr1_8402403, AX-89962103, chr1_8279302, chr1_8334901 , chr1_7561600 , AX-89956272,chr1_7938827, chr1_10810229, chr1_11007071 and

chrl 10884171

According to other particular embodiments, the at least one SNP of the invention is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX- 89930342, AX-89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX- 89973719, AX-89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX- 89952945, AX-89934682, AX-89951942, AX-89937020, AX-89924837, AX-89958601 , AX- 89923477, AX-89959350, AX-89929482, AX-89937712, AX-89949602, AX-89925103, AX- 89938051 , AX-89924174, AX-89936461 , AX-89916703, AX-89935317 and AX-89966423.

According to other particular embodiments, the at least one SNP of the invention is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX- 89930342, AX-89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX- 89973719, AX-89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX- 89952945 and AX-89934682.

According to other particular embodiments, the at least one SNP of the invention is AX- 89929954 or AX-89918280.

According to more particular embodiments, the at least one SNP of the invention is AX- 89929954.

According to other more particular embodiments, the at least one SNP of the invention is AX- 89918280. According to further particular embodiments, the at least one SNP of the invention is selected from the group consisting of: chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_741 1803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chrl 10439048.

According further particular embodiment, the at least one SNP of the invention is selected from the group consisting of: chr1_7515539, chr1_7108873 and chr1_6864558. According to certain embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229.

According to particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in any one of SEQ ID NOs: 1 to 34. According to further other particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in any one of SEQ ID NOs: 160 to 193.

According to further other particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in any one of SEQ ID NOs: 1 to 18.

According to further other particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in any one of SEQ ID NOs: 160 to 162 According to particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in SEQ ID NO: 1 or SEQ ID NO: 2.

According to more particular embodiments, the at least one SNP of the invention is the SNP defined by position 36 of the polymorphic sequence set forth in SEQ ID NO: 1. According to more particular embodiments, the at least one SNP of the invention is the SNP defined by position 36 of the polymorphic sequence set forth in SEQ ID NO:2.

According to particular embodiments, the at least one SNP of the invention is selected from the SNPs corresponding to position 36 of the polymorphic sequences set forth in SEQ ID NO: 230, SEQ ID NO: 231 and SEQ ID NO:232. According to more particular embodiments, the at least one SNP of the invention is the SNP defined by position 36 of the polymorphic sequence set forth in SEQ ID NO: 230.

According to more particular embodiments, the at least one SNP of the invention is the SNP defined by position 36 of the polymorphic sequence set forth in SEQ ID NO:231.

According to more particular embodiments, the at least one SNP of the invention is the SNP defined by position 36 of the polymorphic sequence set forth in SEQ ID NO: 232.

It is understood that the foregoing disclosure regarding the polymorphisms of the invention, and in particular regarding SNPs and IPN resistance allele(s), is applicable to the following aspects. Methods of the invention

The present invention provides in a one aspect a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN). Particularly, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the presence of at least one allele conferring IPN resistance ("IPN resistance allele") within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout.

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table 1. Each of the SNPs listed in Table 1 is contemplated as being disclosed individually as part of the present invention.

According to certain embodiments, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229 by 1 to 5, such as 1 to 2, nucleotide substitutions. The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1 (and repeated in Table 2).

According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 34 and 160 to 193, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 34 and 160 to 193 by 1 to 5, such as 1 to 2, nucleotide substitutions.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to other particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, present at a polymorphic site of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 18 and 160 to 162, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 18 and 160 to 162. by 1 to 5, such as 1 to 2, nucleotide substitutions.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 1 or SEQ ID NO: 2, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 1 or SEQ ID NO: 2 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a cytosine at the position corresponding to position 36 of SEQ ID NO: 1 or the presence of a guanine at the position corresponding to position 36 of SEQ ID NO: 2 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 160, SEQ ID NO: 161 or SEQ ID NO: 162, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 160 , SEQ ID NO: 161 or SEQ ID 162 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a guanine at the position corresponding to position 36 of SEQ ID NO: 160, the presence of a guanine at the position corresponding to position 36 of SEQ ID NO: 161 or the presence of a cytocine at the position corresponding to position 36 SEQ ID NO: 162 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 1 , or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 1 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a cytosine at the position corresponding to position 36 of SEQ ID NO:

1 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 2, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 2 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a guanine at the position corresponding to position 36 of SEQ ID NO:

2 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis. According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 160, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 160 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a guanine at the position corresponding to position 36 of SEQ ID NO: 160 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 161 , or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 161 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a guanine at the position corresponding to position 36 of SEQ ID NO: 161 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 162, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 162 by 1 to 5, such as 1 to 2, nucleotide substitutions; wherein the presence of a cytocine at the position corresponding to position 36 of SEQ ID NO: 162 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis. According to certain other embodiments, the present invention provides a method for predicting increased resistance of a rainbow trout (Oncorhynchus mykiss) to infectious pancreatic necrosis (IPN), the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX- 89949832, AX-89916790, AX-89973719, AX-89962023, AX-89921280, AX-89931666, AX- 89921585, AX-89953905, AX-89952945, AX-89934682, AX-89951942, AX-89937020, AX- 89924837, AX-89958601 , AX-89923477, AX-89959350, AX-89929482, AX-89937712, AX- 89949602, AX-89925103, AX-89938051 , AX-89924174, AX-89936461 , AX-89916703, AX- 89935317, AX-89966423, AX-89933348, AX-89969315, AX-89919958, AX-89968417, AX- 89946851 , AX-89976917, AX-89945446, AX-89919457, AX-89973597, AX-89938138, AX- 89971866, AX-89958882, AX-89961273, AX-89944901 , AX-89919465, AX-89959425, AX- 89917102, AX-89959281 , AX-89916766, AX-89920507, AX-89957370, AX-89934009, AX- 89929663, AX-89952300, AX-89916572, AX-8994691 1 , AX-89974593, AX-89927158, AX- 89970383, AX-89965404, AX-89955634, AX-89932926, AX-89941493, AX-89943031 , AX- 89957682, AX-89960611 , AX-89950199, AX-89928407, AX-89962035, AX-89931951 , AX- 89976536, AX-89916801 , AX-89929085 AX-89925267,chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_741 1803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, chr1_10439048, chr1_8142346, chr1_8092208, chr1_8138683,chr1_8139206, chr1_8139744, chr1_8140789, chr1_8141687, chr1_8154917, chr1_7454708, chr1_7504847, chr1_7505686, chr1_7505817, chr1_8202031 , chr1_8228173, chr1_8309469, chr1_8163977, chr1_27786931 , chr1_8194629, chr1_7505259, chr1_8474659, chr1_8282602,

chr1_8306806, chr1_8341618, chr1_8343786, chr1_8345836, chr1_8350569, chr1_8402403, AX-89962103, chr1_8279302, chr1_8334901 , chr1_7561600, AX-89956272,chr1_7938827, chr1_10810229, chr1_11007071 and chr1_10884171.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX- 89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX- 89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX-89934682, AX- 89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX-89959350, AX- 89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX-89924174, AX- 89936461 , AX-89916703, AX-89935317 and AX-89966423.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX- 89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX- 89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89929954 or AX-89918280; wherein the presence of a cytosine at the position of AX-89929954 or a guanine at the position of AX-89918280 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89929954; wherein the presence of a cytosine at the position of AX-89929954 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89918280; wherein the presence of a guanine at the position of AX-89918280 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to further particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: chr1_7515539, chr1_7108873, chr1_6864558chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_741 1803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chrl 10439048.

The rainbow trout has increased resistance to infectious pancreatic necrosis when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being chr1_7515539, chr1_7108873 or chr1_6864558, wherein the presence of a guanine at the position of chr1_7515539, a guanine at the position of chr1_7108873 or a cytocine chr1_6864558 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being chr1_7515539; wherein the presence of a guanine at the position of chr1_7515539 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being chr1_7108873; wherein the presence of a guanine at the position of chr1_7108873 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being chr1_6864558; wherein the presence of a cytocine at the position of chr1_6864558 indicates that the rainbow trout has increased resistance to infectious pancreatic necrosis. The methods for predicting increased resistance of a rainbow trout to IPN may involve determining the identity of a nucleotide present of at least one allele of more than one SNP, such as at least two, at least three or at least 4 SNPs. The prediction may then be based on the presence of the IPN resistance alleles for the SNPs analysed. For example, one may genotype at least SNPs AX-89929954 (SNP #1) and AX-89918280 (SNP #2). One may also genotype at least SNPs AX-89929954 (SNP #1), AX-89918280 (SNP #2) and AX-89938309 (SNP #3). One may also genotype at least SNPs AX-89929954 (SNP #1), AX-89918280 (SNP #2), AX-89938309 (SNP #3), AX-89960828 (SNP #4) and chr_1 7515539 (SNP #160).

The present invention provides in a further aspect a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the presence of at least one (such as at least two) allele conferring IPN resistance ("IPN resistance allele") within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout; and selecting said rainbow trout as having increased resistance when the at least one IPN resistance allele is present.

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table 1. According to certain embodiments, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 78 and SEQ ID NOs: 160 to 229 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 34, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 34 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to further particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 160 to 193, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 160 to 193 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 1 to 18, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 1 to 18 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to further particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with increased resistance to infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in any one of SEQ ID NOs: 160 to 162, or at a position corresponding to position 36 of a nucleotide sequence which is derived from any one of SEQ ID NOs: 160 to 162 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 1 or SEQ ID NO: 2, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 1 or SEQ ID NO: 2 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a cytosine is present at the position corresponding to position 36 of SEQ ID NO: 1 or a guanine is present at the position corresponding to position 36 of SEQ ID NO: 2.

According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 160, SEQ ID NO: 161 or SEQ ID NO: 162, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 160, SEQ ID NO: 161 or SEQ ID NO: 162 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a guanine is present at the position corresponding to position 36 of SEQ ID NO: 160, guanine is present at the position corresponding to position 36 of SEQ ID NO: 161 or a cytocine is present at the position corresponding to position 36 of SEQ ID NO: 162.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 1 , or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 1 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a cytosine is present at the position corresponding to position 36 of SEQ ID NO: 1.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being located within said genome at a position corresponding to position 36 of the nucleotide sequence set forth in SEQ ID NO: 1 or SEQ ID NO: 2, or at a position corresponding to position 36 of a nucleotide sequence which is derived from SEQ ID NO: 2 by 1 to 5, such as 1 to 2, nucleotide substitutions; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a guanine is present at the position corresponding to position 36 of SEQ ID NO: 2.

According to other certain embodiments, the present invention provides a method for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX- 89949832, AX-89916790, AX-89973719, AX-89962023, AX-89921280, AX-89931666, AX-

89921585 AX-89953905 AX-89952945 AX-89934682 AX-89951942 AX-89937020 AX- 89924837 AX-89958601 AX-89923477 AX-89959350 AX-89929482 AX-89937712 AX- 89949602 AX-89925103 AX-89938051 AX-89924174 AX-89936461 AX-89916703 AX- 89935317 AX-89966423 AX-89933348 AX-89969315 AX-89919958 AX-89968417 AX- 89946851 AX-89976917 AX-89945446 AX-89919457 AX-89973597 AX-89938138 AX- 89971866 AX-89958882 AX-89961273 AX-89944901 AX-89919465 AX-89959425 AX- 89917102 AX-89959281 AX-89916766 AX-89920507 AX-89957370 AX-89934009 AX- 89929663 AX-89952300 AX-89916572 AX-89946911 AX-89974593 AX-89927158 AX- 89970383 AX-89965404 AX-89955634 AX-89932926 AX-89941493 AX-89943031 AX- 89957682 AX-89960611 AX-89950199 AX-89928407 AX-89962035 AX-89931951 AX- 89976536 AX-89916801 AX-89929085 AX-89925267 and , chr1_7515539, chr1_7108873, chr1_6864558 chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 chr1_7412807, chr1_7360179, chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254 chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044 chr1_10439048, chr1_8142346, chr1_8092208, chr1_8138683,

chr1_8139206 chr1_8139744, chr1_8140789, chr1_8141687, chr1_8154917, chr1_7454708, chr1_7504847 chr1_7505686, chr1_7505817, chr1_8202031 , chr1_8228173, chr1_8309469, chr1_8163977 chr1_27786931 , chr1_8194629, chr1_7505259, chr1_8474659,

chr1_8282602 chr1_8306806, chr1_8341618, chr1_8343786, chr1_8345836, chr1_8350569, chrl 8402403 AX-89962103, chr1_8279302, chr1_8334901 , chr1_7561600, AX-

89956272, chr1_7938827, chr1_10810229, chr1_11007071 and chr1_10884171 selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX- 89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX- 89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX-89934682, AX- 89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX-89959350, AX- 89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX-89924174, AX- 89936461 , AX-89916703, AX-89935317 and AX-89966423; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a nucleotide corresponding to the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to other particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: AX- 89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX- 89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682; and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to further particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: 7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_677061 1 , chr1_7412807, chr1_7360179, chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chrl 10439048 and selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1.

According to further other particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being selected from the group consisting of: chrl 7515539, chr1_7108873 and chr1_6864558 selecting said rainbow trout as having increased resistance when the nucleotide of the at least one allele is a the IPN resistance allele of the respective SNP. The IPN resistance allele of each SNP is specified in Table 1. According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89929954 or AX-89918280; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a cytosine is present at the position of AX-89929954 or a guanine is present at the position of AX-89918280.

According to more particular embodiments, the the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89929954; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a cytosine is present at the position of AX-89929954.

According to more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being AX-89918280; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a guanine is present at the position of AX-89918280. According to further more particular embodiments, the method comprises: determining the identity of a nucleotide of at least one allele, optionally of at least two alleles, of at least one single nucleotide polymorphism (SNP) associated with infectious pancreatic necrosis within the genome (e.g., on chromosome 1 of the genome) of said rainbow trout, said at least one SNP being chrl-7515539, chr1_7108873 or chr1_6864558; and selecting said rainbow trout as having increased resistance to infectious pancreatic necrosis when a guanine is present at the position of chrl 7515539, a guanine is present at the position of chr1_7108873 or a cytocine is present at the position of chr1_6864558.

The methods for selecting a rainbow trout having increased resistance to infectious pancreatic necrosis may involve determining the identity of a nucleotide of at least one allele of more than one SNP, such as at least two, at least three or at least 4 SNPs. The selection may then be based on the presence of the IPN resistance alleles for the SNPs analysed. For example, one may genotype at least SNPs AX-89929954 (SNP #1) and AX-89918280 (SNP #2). One may also genotype at least SNPs AX-89929954 (SNP #1), AX-89918280 (SNP #2) and AX- 89938309 (SNP #3). One may also genotype at least SNPs AX-89929954 (SNP #1), AX- 89918280 (SNP #2), AX-89938309 (SNP #4), AX-89960828 (SNP #4) and chr1_7515539 (SNP#160).

Numerous techniques are known in the art for determining the identity of a nucleotide of an allele present at a polymorphic site. For example, the determination may involve sequence analysis of the rainbow trout to be tested using, e.g., traditional sequence methodologies (e.g., the "dideoxy-mediated chain termination method, "also known as the "Sanger Method" (Sanger, F., et al., J. Molec. Biol. 94: 441 (1975); Prober et al. Science 238: 336-340 (1987)) and the "chemical degradation method" also known as the "Maxam-Gilbert method" (Maxam, A. M., et al., Proc. Natl. Acad. Sci. (U. S. A.) 74: 560 (1977). Alternatively, the determination may involve single base extension of DNA oligonucleotides terminating at the polymorphic site (e.g. iPLEX assays from Sequenom (San Diego, USA) and Infinium assays from lllumina (San Diego, USA), allele-specific ligation assays (e.g. Axiom technology from Affymetrix (San Diego, USA), allele-specific PCR (e.g. SNPtype assays from Fluidigm (San Francisco) or KASP assays from LGC Genomics (Teddington, UK)), or competitive hybridisation of probes complementary to the different alleles (e.g. the TaqMan assay from Applied Biosystems (Foster City, USA)). Methods for the detection of allelic variation are also reviewed by Nollau et al., Clin. Chem. 43, 1 114-1120, 1997; and in standard textbooks, for example "Laboratory Protocols for Mutation Detection", Ed. by U. Landegren, Oxford University Press, 1996 and "PCR", 2nd Edition by Newton & Graham, BIOS Scientific Publishers Limited, 1997.

For analyzing SNPs, it may for example be appropriate to use oligonucleotides specific for alternative SNP alleles. Such oligonucleotides which detect single nucleotide variations in target sequences may be referred to by such terms as "allele-specific oligonucleotides", "allele-specific probes", or "allele-specific primers". The design and use of allele-specific probes for analyzing polymorphisms is described in, e.g., Mutation Detection A Practical Approach, ed. Cotton et al. Oxford University Press, 1998; Saiki et al., Nature 324, 163-166 (1986); Dattagupta, EP235726; and Saiki, WO 89/1 1548.

Rainbow trout of the invention

The present invention provides in a further aspect a rainbow trout, such as an isolated rainbow trout, having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a rainbow trout or progeny thereof comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table !

According to certain embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX-89934682, AX- 89951942, AX-89937020 AX-89924837 AX-89958601 AX-89923477 AX-89959350, AX- 89929482, AX-89937712 AX-89949602 AX-89925103 AX-89938051 AX-89924174, AX- 89936461 , AX-89916703 AX-89935317 AX-89966423 AX-89933348 AX-89969315, AX- 89919958, AX-89968417 AX-89946851 AX-89976917 AX-89945446 AX-89919457, AX- 89973597, AX-89938138 AX-89971866 AX-89958882 AX-89961273 AX-89944901 , AX- 89919465, AX-89959425 AX-89917102 AX-89959281 AX-89916766 AX-89920507, AX- 89957370, AX-89934009 AX-89929663 AX-89952300 AX-89916572 AX-89946911 , AX- 89974593, AX-89927158 AX-89970383 AX-89965404 AX-89955634 AX-89932926, AX- 89941493, AX-89943031 AX-89957682 AX-89960611 AX-89950199 AX-89928407, AX- 89962035, AX-89931951 AX-89976536 AX-89916801 , AX-89929085 AX-89925267, , chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 ,

chrl 27891953, AX-89953259, chrl 6740481 , chrl 6770611 , chrl 7412807, chrl 7360179, chrl _7411803, chrl

chrl _6834898, chrl

chrl _7358019, chrl

chrl _7670561 , chrl 10439048,

chrl _8142346, chrl

chrl _8141687, chrl

chrl _8202031 , chrl

chrl _8194629, chrl

chrl _8343786, chrl

chrl _8334901 , chrl 10810229, chrl 11007071 and chr1_10884171

According to particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX- 89934682, AX-89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX- 89959350, AX-89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX- 89924174, AX-89936461 , AX-89916703, AX-89935317 and AX-89966423.

According to other particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682.

According to more particular embodiments, the at least one SNP is AX-89929954 or AX- 89918280.

According to other more particular embodiments, the at least one SNP is AX-89929954.

According to other more particular embodiments, the at least one SNP is AX-89918280. According to further other more particular embodiments, the at least one SNP is chrl 7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX- 89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_741 1803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chrl 10439048.

According to other more particular embodiments, the at least one SNP is chrl 7515539, chr1_7108873 and chr1_6864558. According to further other more particular embodiments, the at least one SNP is chr1_ 7515539.

According to further other more particular embodiments, the at least one SNP is chr1_ 7108873.

According to further other more particular embodiments, the at least one SNP is chr1_ 6864558.

According to certain embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156, and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 112, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 1 12 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to other particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 96, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to other more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 79 and b) nucleotide sequences derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to other more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 80, and b) nucleotide sequences derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 263, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 263 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232 and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further other more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 230 and b) nucleotide sequences derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further other more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 231 , and b) nucleotide sequences derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to further other more particular embodiments, the rainbow trout or progeny thereof, such as an isolated rainbow trout or progeny thereof, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 232, and b) nucleotide sequences derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence

According to certain embodiments, the rainbow trout is a female. According to certain other embodiments, the rainbow trout is a male.

According to certain embodiments, the rainbow trout or progeny thereof is obtained by a method according to the present invention. In one further aspect of the present invention, a rainbow trout or progeny thereof comprises in its genome at least one allele conferring IPN resistance obtainable by a process comprising the steps of: a) genotyping the trout,

b) selecting individuals having at least one allele preferably two alleles conferring IPN resistance ("IPN resistance allele"); and

c) mating individuals in such a way that at least one individual within each mated pair has two alleles conferring IPN resistance According to certain embodiments the mating in c) may also be conducted in such a way that the mated pair each has two alleles conferring IPN resistance, or that each mated pair has one allele conferring IPN resistance.

According to certain embodimens the rainbow trout or progeny thereof obtained by the process, the at least one IPN resistance allele may be an allele of at least one single nucleotide polymorphism (SNP).

According to further certain embodimens the rainbow trout or progeny thereof obtained by the process, the at least one SNP may be selected from the SNPs listed in Table 1.

According to more certain embodiments the rainbow trout or progeny thereof obtained by the process, comprises within its genome at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to certain embodiments, the rainbow trout is a female.

According to certain other embodiments, the rainbow trout is a male.

The present invention provides in a further aspect a population of rainbow trouts, such as an isolated population, each individual within the population having increased resistance to infectious pancreatic necrosis. Particularly, the present invention provides a population of rainbow trouts, each individual within the population comprising within its genome at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table !

According to certain embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX-89934682, AX- 89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX-89959350, AX- 89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX-89924174, AX- 89936461 , AX-89916703, AX-89935317, AX-89966423, AX-89933348, AX-89969315, AX- 89919958, AX-89968417, AX-89946851 , AX-89976917, AX-89945446, AX-89919457, AX- 89973597, AX-89938138, AX-89971866, AX-89958882, AX-89961273, AX-89944901 , AX- 89919465, AX-89959425, AX-89917102, AX-89959281 , AX-89916766, AX-89920507, AX- 89957370, AX-89934009, AX-89929663, AX-89952300, AX-89916572, AX-89946911 , AX- 89974593, AX-89927158, AX-89970383, AX-89965404, AX-89955634, AX-89932926, AX- 89941493, AX-89943031 , AX-89957682, AX-89960611 , AX-89950199, AX-89928407, AX- 89962035, AX-89931951 , AX-89976536, AX-89916801 , AX-89929085, AX-89925267 , chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 ,

chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chrl _7411803, chrl

chrl _6834898, chrl

chrl _7358019, chrl

chrl _7670561 , chrl

chrl _8142346, chrl

chrl _8141687, chrl

chrl _8202031 , chrl

chrl _8194629, chrl

chrl _8343786, chrl

chrl _8334901 , chrl

and chr1_10884171

According to particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX- 89934682, AX-89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX- 89959350, AX-89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX- 89924174, AX-89936461 , AX-89916703, AX-89935317 and AX-89966423.

According to other particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682.

According to more particular embodiments, the at least one SNP is AX-89929954 or AX- 89918280.

According to other more particular embodiments, the at least one SNP is AX-89929954.

According to other more particular embodiments, the at least one SNP is AX-89918280. According to further particular embodiments, the at least one SNP is selected from the group chrl 7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chrl 10439048

According to further more particular embodiments, the at least one SNP is chrl 7515539, chr1_7108873 and chr1_6864558.

According to certain embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156, and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 112, and b) nucleotide sequences derived from any one of SEQ ID NOs: 81 to 1 12 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to other particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 96, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 79, and b) nucleotide sequences derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 80, and b) nucleotide sequences derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 263, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 263 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 230 and b) nucleotide sequences derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 231 , and b) nucleotide sequences derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 232, and b) nucleotide sequences derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to certain embodiments, the population of rainbow trout is a population of female rainbow trouts.

According to certain embodiments, the population of rainbow trout is a population of male rainbow trouts.

According to certain embodiments, the population of rainbow trout is a population of male and female rainbow trouts.

In one further aspect of the present invention, a population of rainbow trout may comprise in its genome at least one allele conferring IPN resistance obtainable by a process comprising the steps of: a) genotyping the trout,

b) selecting individuals having at least one allele preferably two alleles conferring IPN resistance ("IPN resistance allele"); and

c) mating individuals in such a way that at least one individual within each mated pair has two alleles conferring IPN resistance

According to certain embodiments the mating in c) may also be conducted in such a way that the mated pair each has two alleles conferring IPN resistance, or that each mated pair has one allele conferring IPN resistance. According to certain embodimens the population of rainbow trout obtained by the process, the at least one IPN resistance allele may be an allele of at least one single nucleotide polymorphism (SNP).

According to further certain embodimens the population of rainbow trout obtained by the process, the at least one SNP is selected from the SNPs listed in Table 1.

According to further more certain embodiments the population obtained by the process, comprises within its genome at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence

According to certain embodiments, the population of rainbow trout is a population of female rainbow trouts.

According to certain embodiments, the population of rainbow trout is a population of male rainbow trouts.

According to certain embodiments, the population of rainbow trout is a population of male and female rainbow trouts.

The present invention provides in a further aspect a rainbow trout cell, such as an isolated rainbow trout cell, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table 1. According to certain embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX- 89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX-89934682, AX- 89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX-89959350, AX- 89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX-89924174, AX- 89936461 , AX-89916703, AX-89935317, AX-89966423, AX-89933348, AX-89969315, AX- 89919958, AX-89968417, AX-89946851 , AX-89976917, AX-89945446, AX-89919457, AX- 89973597, AX-89938138, AX-89971866, AX-89958882, AX-89961273, AX-89944901 , AX- 89919465, AX-89959425, AX-89917102, AX-89959281 , AX-89916766, AX-89920507, AX- 89957370, AX-89934009, AX-89929663, AX-89952300, AX-89916572, AX-89946911 , AX- 89974593, AX-89927158, AX-89970383, AX-89965404, AX-89955634, AX-89932926, AX- 89941493, AX-89943031 , AX-89957682, AX-89960611 , AX-89950199, AX-89928407, AX- 89962035, AX-89931951 , AX-89976536, AX-89916801 , AX-89929085, AX-89925267 , chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 ,

chrl 27891953, AX-89953259, chrl 6740481 , chrl 6770611 , chrl 7412807, chrl 7360179, chrl _7411803, chrl

chrl _6834898, chrl

chrl _7358019, chrl

chrl _7670561 , chrl 10439048,

chrl _8142346, chrl

chrl _8141687, chrl 8154917, chrl 7454708, chrl 7504847, chrl 7505686, chrl 7505817, chrl _8202031 , chrl

chrl _8194629, chrl

chrl _8343786, chrl

chrl 8334901 , chrl 10810229, chrl 11007071 and chrl 10884171.

According to particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX- 89934682, AX-89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX- 89959350, AX-89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX- 89924174, AX-89936461 , AX-89916703, AX-89935317 and AX-89966423.

According to other particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682.

According to more particular embodiments, the at least one SNP is AX-89929954 or AX- 89918280.

According to other more particular embodiments, the at least one SNP is AX-89929954.

According to other more particular embodiments, the at least one SNP is AX-89918280. According to certain embodiments, the present invention provides a rainbow trout cell, such as an isolated rainbow trout cell, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to particular embodiments, the rainbow trout cell, such as an isolated of rainbow trout cell, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 1 12, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 1 12 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to other particular embodiments, the rainbow trout cell, such as an isolated rainbow trout cell, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 96, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the rainbow trout cell, such as an isolated rainbow trout cell, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the rainbow trout cell, such as an isolated rainbow trout cell, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 79, and b) nucleotide sequences derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the rainbow trout cell, such as an isolated rainbow trout cell, comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 80, and b) nucleotide sequences derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to further particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 263, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 263 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 230, and b) nucleotide sequences derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 231 , and b) nucleotide sequences derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 232, and b) nucleotide sequences derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to certain embodiments, the rainbow trout cell is a gamete.

According to particular embodiments, the rainbow trout cell is an egg, such as an eyed egg.

According to more particular embodiments, the egg is unfertilized.

According to other more particular embodiments, the egg is fertilized. According to particular embodiments, the rainbow trout cell is a sperm cell.

According to certain other embodiments, the rainbow trout cell is a somatic cell.

According to certain embodiments, the rainbow trout cell has been isolated from a rainbow trout of the invention.

According to particular embodiments, the rainbow trout cell has been isolated from a female rainbow trout of the invention.

According to particular embodiments, the rainbow trout cell has been isolated from a male rainbow trout of the invention.

The present invention provides in a further aspect a population of rainbow trout cells, such as an isolated population of rainbow trout cells, each individual cell within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP).

According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table !

According to certain embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX-89928530,

AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX-89962023, AX-

89921280, AX- 89931666, AX- 89921585, AX- 89953905, AX- 89952945, AX- 89934682, AX-

89951942, AX- 89937020, AX- 89924837, AX- 89958601 , AX- 89923477, AX- 89959350, AX-

89929482, AX- 89937712, AX- 89949602, AX- 89925103, AX- 89938051 , AX- 89924174, AX-

89936461 , AX- 89916703, AX- 89935317, AX- 89966423, AX- 89933348, AX- 89969315, AX-

89919958, AX- 89968417, AX- 89946851 , AX- 89976917, AX- 89945446, AX- 89919457, AX-

89973597, AX- 89938138, AX- 89971866, AX- 89958882, AX- 89961273, AX- 89944901 , AX-

89919465, AX- 89959425, AX- 89917102, AX- 89959281 , AX- 89916766, AX- 89920507, AX-

89957370, AX- 89934009, AX- 89929663, AX- 89952300, AX- 89916572, AX- 8994691 1 , AX-

89974593, AX- 89927158, AX- 89970383, AX- 89965404, AX- 89955634, AX- 89932926, AX-

89941493, AX- 89943031 , AX- 89957682, AX- 8996061 1 , AX- 89950199, AX- 89928407, AX- 89962035, AX-89931951 , AX-89976536, AX-89916801 , AX-89929085, AX-89925267 , chr1_7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 ,

chr1 27891953, AX-89953259, chrl 6740481 , chrl 6770611 , chrl 7412807, chrl 7360179, chrl _7411803, chrl

chrl _6834898, chrl

chrl _7358019, chrl

chrl _7670561 , chrl

chrl _8142346, chrl

chrl _8141687, chrl

chrl _8202031 , chrl

chrl _8194629, chrl

chrl _8343786, chrl

chrl 8334901 , chrl

and chrl 10884171.

According to particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945, AX- 89934682, AX-89951942, AX-89937020, AX-89924837, AX-89958601 , AX-89923477, AX- 89959350, AX-89929482, AX-89937712, AX-89949602, AX-89925103, AX-89938051 , AX- 89924174, AX-89936461 , AX-89916703, AX-89935317 and AX-89966423.

According to other particular embodiments, the at least one SNP is selected from the group consisting of: AX-89929954, AX-89918280, AX-89938309, AX-89960828, AX-89930342, AX- 89928530, AX-89949788, AX-89928131 , AX-89949832, AX-89916790, AX-89973719, AX- 89962023, AX-89921280, AX-89931666, AX-89921585, AX-89953905, AX-89952945 and AX-89934682.

According to more particular embodiments, the at least one SNP is AX-89929954 or AX- 89918280. According to other more particular embodiments, the at least one SNP is AX-89929954.

According to other more particular embodiments, the at least one SNP is AX-89918280.

According to further particular embodiments, the at least one SNP is selected from the group: chrl 7515539, chr1_7108873, chr1_6864558, chr1_7186663, chr1_6730531 , chr1_27891953, AX-89953259, chr1_6740481 , chr1_6770611 , chr1_7412807, chr1_7360179, chr1_7411803, chr1_7431445, chr1_7433199, chr1_7441254, chr1_7441877, chr1_7533570, chr1_6834898, chr1_6730142, chr1_6746052, chr1_6794061 , chr1_7399212, chr1_7442637, chr1_7358019, chr1_7709828, chr1_7598090, chr1_7626471 , chr1_7598743, chr1_7670293, chr1_7670561 , chr1_7647634, chr1_7356089, chr1_8109044, and chr1_10439048

According to further more particular embodiments, the at least one SNP is chr1_7515539, chr1_7108873 and chr1_6864558. According to other more particular embodiments, the at least one SNP is chr1_7515539,

According to other more particular embodiments, the at least one SNP is chr1_7108873.

According to other more particular embodiments, the at least one SNP is chr1_6864558 .

According to certain embodiments, the present invention provides a population of rainbow trout cells, such as an isolated population of rainbow trout cells, each individual cell within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156, and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to particular embodiments, the population of rainbow trout cells, such as an isolated population of rainbow trout cells, is a population wherein each individual cell within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 1 12, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 112 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to other particular embodiments, the population of rainbow trout cells, such as an isolated population of rainbow trout cells, is a population wherein each individual cell within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 96, and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to more particular embodiments, the population of rainbow trout cells, such as an isolated population of rainbow trout cells, is a population wherein each individual cell within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to more particular embodiments, the population of rainbow trout cells, such as an isolated population of rainbow trout cells, is a population wherein each individual cell within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 79, and b) nucleotide sequences derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout cells, such as an isolated population of rainbow trout cells, is a population wherein each individual cell within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 80, and b) nucleotide sequences derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 263, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 263 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232, and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 230, and b) nucleotide sequences derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 231 , and b) nucleotide sequences derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to more particular embodiments, the population of rainbow trout, such as an isolated population of rainbow trout, is a population wherein each individual within the population comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NO: 232 and b) nucleotide sequences derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to certain embodiments, the cells of said population are gametes.

According to particular embodiments, the cells of said population are eggs, such as eyed eggs.

According to more particular embodiments, the eggs are unfertilized.

According to other more particular embodiments, the eggs are fertilized. According to other more particular embodiments, the population of rainbow trout cells is a mixed population of fertilized and unfertilized eggs.

According to other particular embodiments the cells of said population are sperm cells.

According to certain other embodiments, the cells of said population are somatic cells.

According to certain embodiments, the population of rainbow trout cells has been isolated from a rainbow trout of the invention. According to particular embodiments, the population of rainbow trout cells has been isolated from a female rainbow trout of the invention.

According to particular embodiments, the population of rainbow trout cells has been isolated from a male rainbow trout of the invention. The present invention provides in a particular aspect a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP). According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table 1.

According to particular embodiments, the at least one SNP is AX-89929954 or AX-89918280.

According to certain embodiments, the present invention provides a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 , and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence. According to particular embodiments, the present invention provides a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to further other more particular embodiments, the at least one SNP is chrl 7515539, chr1_7108873 or chr1_6864558.

According to particular embodiments, the present invention provides a rainbow trout egg, such as an isolated rainbow trout egg, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232 and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to certain embodiments, the rainbow trout egg is unfertilized. According to certain other embodiments, the rainbow trout egg is fertilized.

According to particular embodiments, the rainbow trout egg is an eyed egg.

According to certain embodiments, the rainbow trout egg has been isolated from a female rainbow trout of the invention.

The present invention provides in a further aspect a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, each individual egg of the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one allele conferring IPN resistance ("IPN resistance allele").

According to certain embodiments, the at least one IPN resistance allele is an allele of at least one polymorphism, such as at least one single nucleotide polymorphism (SNP). According to certain embodiments, the at least one SNP is selected from the SNPs listed in Table 1.

According to particular embodiments, the at least one SNP is AX-89929954 or AX-89918280.

According to further embodiments, the at least one SNP is chrl 7515539, chr1_7108873 or chr1_6864558. According to certain embodiments, the present invention provides a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, which comprises within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156, and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provide that said nucleotide substitutions are not at position 36 of said derived sequence.

According to particular embodiments, the present invention provides a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, each individual egg within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence.

According to particular embodiments, the present invention provides a population of rainbow trout eggs, such as an isolated population of rainbow trout eggs, each individual egg within the population comprising within its genome (e.g., on chromosome 1 of its genome) at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232, and b) nucleotide sequences derived from any one of SEQ ID NO: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence. According to certain embodiments, the population of rainbow trout eggs is unfertilized.

According to certain other embodiments, the population of rainbow trout eggs is fertilized.

According to certain other embodiments, the population of rainbow trout eggs is a population of eyed eggs.

According to certain embodiments, the population of rainbow trout eggs has been isolated from a female rainbow trout of the invention.

Nucleic acid molecules of the invention

The present invention provides in a further aspect a nucleic acid molecule, such as an isolated nucleic acid molecule. More particularly, the present invention provides a nucleic acid, such as an isolated nucleic acid comprising at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 to 156 and 230 to 299, b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

According to certain embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 to 112, b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 1 12 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b). According to certain other embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 to 96, b) nucleotide sequences derived from any one of SEQ ID NOs: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

According to particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 79 and SEQ ID NO: 80, b) nucleotide sequences derived from any one of SEQ ID NO: 79 and SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b). According to more particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises the nucleotide sequence set forth in SEQ ID NO: 79, or a nucleotide sequence derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, or a complement thereof. According to more particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises the nucleotide sequence set forth in SEQ ID NO: 80, or a nucleotide sequence derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, or a complement thereof. According to certain embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NO: 230 to 263, b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 263 by 1 to 5, such as 1 to 2, nude otide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

According to particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises at least one nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232 , and b) nucleotide sequences derived from any one of SEQ ID NOs: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, and c) complements of a) and b).

According to more particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises the nucleotide sequence set forth in SEQ ID NO: 230, or a nucleotide sequence derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, or a complement thereof.

According to more particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises the nucleotide sequence set forth in SEQ ID NOs: 231 or a nucleotide sequence derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, or a complement thereof.

According to more particular embodiments, the nucleic acid molecule, such as an isolated nucleic acid molecule, comprises the nucleotide sequence set forth in SEQ ID NOs: 232 or a nucleotide sequence derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence, or a complement thereof.

The nucleic acid molecule may have a length of at least 71 nucleotides, such as at least 75 nucleotides or at least 100 nucleotides.

According to certain embodiments, the nucleic acid has a length from 71 nucleotides to 400 nucleotides, such as from 71 nucleotides to 200 nucleotides or from 71 to 100 nucleotides.

The present invention provides in a further aspect an oligonucleotide, such as an isolated oligonucleotide. More particular, the present invention provides an oligonucleotide, such as an isolated oligonucleotide, comprising at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 156 and 230 to 299 and b) nucleotide sequences derived from any one of SEQ ID NOs: 79 and 156 and 230 to 299 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to certain embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 112, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and 112 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide. According to certain embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 to 96, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 to 96 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 79 and 80, and b) nucleotide sequences derived from any one of SEQ ID NO: 79 and 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to more particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NOs: 79, and b) nucleotide sequences derived from SEQ ID NO: 79 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to other more particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NOs: 80, and b) nucleotide sequences derived from SEQ ID NO: 80 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to certain embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 263, and b) nucleotide sequences derived from any one of SEQ ID NO: 230 and 263 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide. According to particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequences set forth in SEQ ID NOs: 230 to 232 and b) nucleotide sequences derived from any one of SEQ ID NO: 230 to 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to more particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NOs: 230, and b) nucleotide sequences derived from SEQ ID NO: 230 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide. According to other more particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NOs: 80, and b) nucleotide sequences derived from SEQ ID NO: 231 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to other more particular embodiments, the oligonucleotide comprises at least 10 contiguous nucleotides, such as at least 16 contiguous nucleotides, of a nucleotide sequence selected from the group consisting of a) the nucleotide sequence set forth in SEQ ID NOs: 80, and b) nucleotide sequences derived from SEQ ID NO: 232 by 1 to 5, such as 1 to 2, nucleotide substitutions, provided that said nucleotide substitutions are not at position 36 of said derived sequence; wherein said at least 10 contiguous nucleotides include the nucleotide at position 36 of a) or b); or a complement of said oligonucleotide.

According to certain embodiments, the oligonucleotide or complement thereof has a length of at least 10 nucleotides, such as at least 16 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of at least 16 nucleotides, such as at least 20 nucleotides. According to certain embodiments, the oligonucleotide or complement thereof has a length of at least 20 nucleotides, such as at least 25 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of 10 to 200 nucleotides, such as 10 to 150 nucleotides. According to certain embodiments, the oligonucleotide or complement thereof has a length of 10 to 100 nucleotides, such as 10 to 70 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of 16 to 100 nucleotides, such as 16 to 70 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of 10 to 50 nucleotides, such as 10 to 40 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of 16 to 50 nucleotides, such as 16 to 40 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof has a length of 10 to 30 nucleotides, such as 8 to 25 nucleotides. According to certain embodiments, the oligonucleotide or complement thereof has a length of 16 to 30 nucleotides, such as 16 to 25 nucleotides.

According to certain embodiments, the oligonucleotide or complement thereof is a primer, such as a PCR primer.

According to certain embodiments, the oligonucleotide or complement thereof is a probe, such as a hybridization probe.

According to certain embodiments, the present invention provides a complement to the oligonucleotide specified above. Such complement may be used as a probe, such as a hybridization probe.

A probe or primer according to the present invention may have attached to it a detectable label or reporter molecule. Typical labels include radioactive isotopes, enzyme substrates, co- factors, ligands, chemiluminescent or fluorescent agents, haptens, and enyzmes. Methods for labelling and guidance in the choice of labels appropriate for various purposes are discussed, for example, in Sambrook et al. (In Molecular Cloning, A Laboratory Manual, CSHL, New York, 1989) and Ausubel et al. (In Current Protocols in Molecular Biology, John Wiley & Sons, New York, 1998). As a particular example, a probe or primer may include one fluorophor, such as an acceptor fluorophore or donor fluorophor. Such fluorophore may be attached at the 5'- or 3' end of the probe/primer.

Probes are generally at least 15 nucleotides in length, such as at least 16, at least 17, at least 18, at least 19, at least 20, at least 25, at least 30, at least 35, at least 40, at least 45, at least 50, at least 55, at least 60, at least 65, at least 70, or more contiguous nucleotides complementary to the target nucleic acid molecule, such as 20 to 70 nucleotides, 20 to 60 nucleotides, 20 to 50 nucleotides, 20 to 40 nucleotides, or 20 to 30 nucleotides.

Primers are shorter in length. An oligonucleotide used as primer may be at least 10 nucleotides in length. The specificity of a primer increases with its length. Thus, for example, a primer that includes 30 consecutive nucleotides will anneal to a target sequence with a higher specificity that a corresponding primer of only 15 nucleotides. Thus, to obtain greater specificity, primers of the invention are at least 15 nucleotides in length, such as at least 16, at least 17, at least 18, at least 19, at least 20, at least 25, at least 30, at least 35, at least 40, at least 45, at least 50, at least 55, at least 60, at least 65, at least 70, or more contiguous nucleotides complementary to the target nucleic acid molecule, such as 15 to 70 nucleotides, 15 to 60 nucleotides, 15 to 50 nucleotides, 15 to 40 nucleotides, or 15 to 30 nucleotides. Primer pairs can be used for amplification of nucleic acid sequences, for example, by PCT, real-time-PCR, or other nucleic-acid amplification methods known in the art.

Validation of the results underlying the present invention

Two challenge tests were carried out, in order to validate the association between IPN resistance and alleles at four of the polymorphisms of the invention. The tests were carried out in two 100 liter tanks, and in each tank a group of rainbow trout individuals was tested for resistance against one of two strains of the IPN virus. The two strains were 1) a strain

(AGT1 1-2) of serotype Sp isolated from Norwegian sea-water-reared rainbow trout; the same strain that was used when the Inventions were first made, and 2) a strain of serotype Wb isolated from an outbreak in rainbow trout in Chile. The validation experiment confirmed that a statistically significant association exists between IPN resistance and alleles at all four investigated polymorphisms. Furthermore, the association was valid also when the IPN virus strain used in the initial discovery of the Invention (a strain of serotype Sp) was replaced with a different strain (of serotype Wb, West Buxon). It follows that the association between DNA polymorphisms and IPN resistance is reproducible and independent of virus strain.

The four polymorphisms tested in the validation experiment were representatives of all polymorphisms of the Invention. The remaining polymorphisms of the Invention were not tested directly. However, since all polymorphisms of the Inventions are markers of one and the same quantitative trait locus (QTL), it is reasonable to conclude that any other polymorphisms of the Invention would have passed the validation test.

It is a natural and necessary consequence of these findings that the DNA polymorphisms of the present invention may be used in order to create rainbow trout with increased resistance to IPN. The results from this validation study is presented in Examples 2 and 3.

Certain definitions

As used herein, "increased resistance" to infectious pancreatic necrosis means that an individual having increased resistance has a higher probability of surviving an IPN outbreak than a random individual (from the same outbreak) with whom it is comparable. Two individuals are comparable if they are, with regards to all discriminating factors except the genotype at the SNP which is used for predicting IPN-resistance, random representatives of one and the same population of rainbow trout. An IPN outbreak is a condition in which live rainbow trout are exposed to the IPN virus in such a way that some individuals get infected and spread the virus (leading to a spread of the disease). An outbreak can be, for example, an unintended outbreak of the virus in a tank or pond of freshwater reared rainbow trout, an unintended outbreak in a net-pen of seawater reared trouts, or a controlled outbreak induced as part of a laboratory experiment. The IPN challenge-test described here (challenge tests 1 , 2, 3 and 4) are examples of laboratory experiments that measure survival rates during IPN outbreaks.

As used herein, an "IPN resistance allele" is an allele conferring increased resistance to infectious pancreatic necrosis. This means that a rainbow trout having such allele at the position of a polymorphism detailed herein shows increased resistance to IPN. The "IPN resistance allele" may identify a single nucleotide polymorphism that can be used to detect or determine the degree of resistance to IPN.

As used herein, a "polymorphism" is a variation in a genomic sequence. In particular, a polymorphism is a position on the genome where different allelic variants are generally found between individuals of a population, or between individuals from different populations. The polymorphism may be a single nucleotide difference present at a locus, or may be an insertion or deletion of one or a few nucleotides at a position of a gene.

As used herein, a "single nucleotide polymorphism" or "SNP" refers to a single base (nucleotide) polymorphism in a DNA sequence among individuals in a population. As such , a single nucleotide polymorphism is characterized by the presence in a population of one or two, three or four different nucleotides (i.e. adenine, cytosine, guanine or thymine), typically less than all four nucleotides, at a particular locus in a genome, such as the genome of rainbow trout. As used herein, "polymorphic sequence" refers to a nucleotide sequence including a polymorphic site at which a SNP or another type of polymorphism occurs.

As used herein, a "polymorphic site" is the locus or position within a given sequence at which divergence occurs. Preferred polymorphic sites have at least two alleles, each occurring at frequency greater than 1 %, and more preferably greater than 10%. Those skilled in the art will recognize that nucleic acid molecules may be double-stranded molecules and that reference to a particular site on one strand refers, as well, to the corresponding site on a complementary strand. In defining a polymorphic site or allele reference to an adenine, a thymine, a cytosine, or a guanine at a particular site on one strand of a nucleic acid molecule also defines the thymine, adenine, guanine, or cytosine (respectively) at the corresponding site on a complementary strand of the nucleic acid.

Herein, when a polymorphism is specified as having a particular allele, then it is understood that that particular allele goes together with the sequence given for the polymorphism. For example, when it is said that guanine is the resistance-allele of SNP AX-89929954 (SNP #1), then it is understood that the resistance allele of AX-89929954 harbours a guanine nucleotide in the polymorphic site, defined in Table 2, when the DNA is read in the direction defined in Table 2. In other words, as stated in Table 2, the resistance form of the DNA sequence of AX- 89929954 (with flanking sequence) is

GAAAGAAACAGTGATAGGCTTTTAGTGAGCACATACATTTGACACACAGTTGTGTGAAAA CAAAGCATGTG (polymorphic site underlined) when read in the direction defined in Table 2. When read in the opposite direction, the sequence of AX-89929954 (with flanking sequence) is

CACATGCTTTGTTTTCACACAACTGTGTGTCAAATGTATGTGCTCACTAAAAGCCTATCA C TGTTTCTTTC (polymorphic site underline). Although only one direction is used when IPN resistance alleles and non-IPN resistance alleles are defined herein, the two read directions are equivalent.

As used herein, a "sample", such as a biological sample that includes nucleic acid molecules, is a sample obtained from a rainbow trout, including, but not limited to, cells, tissue, and bodily fluids. As used herein, an "oligonucleotide" is a plurality of joined nucleotides joined by native phosphodiester bonds, typically from 8 to 300 nucleotides in length.

As used herein, "probes" and "primer" are isolated oligonucleotides of at least 8 nucleotides, such as at least 10 nucleotides, capable of hybridizing to a target nucleic acid.

As used herein, "isolated" means that an organism or a biological component, such as a cell, population of cells or a nucleic acid molecule, has been separated from its natural environment.

As used herein, "genetic linkage" refers to the tendency of polymorphisms that are located close to each other on a chromosome to be inherited together during meiosis. Thus, polymorphisms located close to each other on the same chromosome are said to be genetically linked. Alleles at two such genetically linked loci are co-inherited (from parents to offspring) more often than they are not. Assume, for example, two polymorphisms; polymorphism A having alleles A1 and A2, and polymorphism B having alleles B1 and B2. Assume further that a given rainbow trout carries all of the alleles A1 , A2, B1 , and B2 (in other words, this rainbow trout is heterozygous at both marker and marker B). If alleles A1 and B1 are, in this particular rainbow trout, located on the same chromosome copy, then alleles A1 and B1 are co-inherited, to the offspring of the rainbow trout, more often than not.

As used herein, "genetic linkage analysis" refers to a statistical procedure where genotype data, coming from sets of animals comprising parents and their offspring, are investigated in order to test for the presence of genetic linkage between polymorphisms. Genetic linkage analysis can be used in order to assign polymorphisms to chromosomes, provided that the analysis incorporates polymorphisms that have already been assigned to chromosome using, for example, Fluorescence In Situ Hybridiation.

As used herein "Fluorescence In Situ Hybridiation" or "FISH" refers to a technique that detect the presence or absence of specific DNA sequences on chromosomes. FISH can be used in order to assign known DNA polymorphisms to chromosomes.

"Centi-Morgen" is a unit of measurement, used to describe genetic distances, where genetic distance is a measure of the extent to which two polymorphisms are genetically linked.

Linkage disquilibrium (LD) or, more precisely, gametic phase linkage disequilibrium, is used in order to describe the co-inheritance of alleles at genetically linked polymorphisms, at the population level. Assume, for example, two polymorphisms located on the same chromosome; polymorphism A having alleles A1 and A2, and polymorphism B having alleles B1 and B2. All copies of the chromosome in question will harbour a combination of alleles at the two loci (i.e. a haplotype), and there are four possible haplotypes: A1-B1 , A1-B2, A2-B1 , and A2-B2. The two loci are in said to be LD with each other if the number of A1-B1 and A2-B2 haplotypes within the population are significantly larger or significantly smaller than the number of A1-B2 and A2-B1 haplotypes.

Where a numerical limit or range is stated herein, the endpoints are included. Also, all values and sub ranges within a numerical limit or range are specifically included as if explicitly written out.

Having generally described this invention, a further understanding can be obtained by reference to certain specific examples, which are provided herein for purposes of illustration only, and are not intended to be limiting unless otherwise specified.

Examples

Example 1 : Identification of single nucleotide polymorphisms predictive for IPN

Two challenge tests were performed, testing the resistance of rainbow trout fry to IPN. Production of and raising of family groups as well as preparation for challenge was performed as previously described in Wetten et al., 2011.

The first test (Challenge 1) was performed with the aim of finding the optimal virus isolate for IPN challenge in rainbow trout. Two separate virus strains were tested; the V-1244 strain which is virulent to Atlantic salmon, and another strain isolated from sea water reared rainbow trout in Norway (Sp-serotype, AGTT1 1-2). Both strains were tested in triplicate tanks, each containing 100 fish derived from ten separate families of trout. Deceased or moribound individuals were sampled daily. The test was terminated 38 days after initiation of the test. The salmon strain caused 20% overall mortality, whereas the rainbow trout strain was far more virulent, causing 85% overall mortality.

The virus strain isolated from rainbow trout (AGTT11-2) was used in the second challenge (Challenge 2). The aim of this study was to identify SNPs that are diagnostic of the level of IPN resistance in individual rainbow trout, i.e. SNPs associated with IPN-resistance. Fifty different rainbow trout families were included in the test, each represented with a separate tank of 200 fry (mean weight of fry = 0.2 grams). All families were bath-challenged by addition of a volume of virus supernatant corresponding to a final virus concentration of approximately 10 ⁶ TCID ₅₀ /ml water. Deceased or moribound individuals were sampled daily. All fish dying during the trial as well as all survivors collected at termination 40 days post challenge were frozen at -18°C to enable DNA analysis. The test was terminated 48 days after initiation of the test. From Challenge 2, 8683 animals were included in the analysis; these animals comprising 46 full-sibling groups originating from 29 male parents and 25 female parents. The number of full- sibling groups per male parent ranged from 1 to 3, as did the number of full-sibling groups per female parent. The overall mortality rate in Challenge test 2 was 93 %. Within full-sibling groups, the mortality rate varied from 67,8 % to 99.5 %. Of the 8683 challenge-tested individuals, 1723 were genotypet. These 1723 animals comprised (on average) 19 early mortalities and 19 survivors or late mortalities from each of the 46 full-sibling groups. Here, the early mortalities were the first fish to die within their respective full-sibling group, excluding individuals that died prior to day 13 of challenge test 1 (the few deaths occurring before day 13 were assumed not to be due to IPN). The late mortalities were the individuals that died, or were the last to die, within their respective full-sibling groups. Deceased individuals that displayed signs of having been unable to sustain themselves on solid feedstuff were not genotyped; these were identified on the basis of their small size and the lack of red pigments (coming from the feedstuff) in their fins.

DNA was extracted from the tail fin of the to-be-genotyped animals, using a standard method (the DNAeasy 96 kit from QIAGEN (Venlo, the Netherlands)).

The 1723 animals were genotypet using the Axiom ® Trout genotyping Array, a SNP-chip harbouring 57,501 single nucleotide polymorphisms (SNPs) in 96-well format. This SNP-chip was developed by AquaGen in collaboration with the United Stated Department of Agriculture (USDA) and Affymetrix, and is commercially available from Affymetrix (San Diego, USA). Genotyping was performed using Affymetrix' proprietary Axiom platform, following the Axiom® 2.0 Assay Automated Workflow User Guide

(http://media.affymetrix.com/support/downloads/manuals/ax iom_2_assay_auto_workflow_user _guide.pdf).

Based on the raw data provided by the Axiom machinery, genotypes were called using the Affymetrix PowerTools software

(http://www.affymetrix.com/estore/partners_programs/progr ams/developer/tools/powertools.aff x). The analysis and interpretation of the raw data was done according to the Best Practices Workflow provided by Affymetrix (http://www.affymetrix.com/estore/partners_programs/prog rams/developer/tools/powertools.aff x). SNPs and animals having quality parameters below the default thresholds, provided in the Best Practices Workflow, were not considered for further analyses.

The SNPs were tested individually for association to IPN-resistance, defined as time to death (or end of test for survivors) under challenge-testing. Testing was done through likelihood ratio testing comparing a linear mixed model including random effect of family (including polygenic effects) and a given SNP with a basis model ignoring the SNP effect:

H ₀ : y = 1 μ + Zu + e where y is a vector of time-to-death phenotypes of individuals with known genotypes for a given SNP locus, μ is the fixed effect of the overall mean, u~JV(0, Ισ^) is a vector of random effects of families, Z is an incidence matrix linking individuals to families, g~N(0, o£ _NP ) is the allele substitution effect of a specific SNP, M is a genotype matrix (with genotypes coded 0, 1 and 2 for the first homozygote, heterozygote and the other homozygote) and e~N(0, Ισ _β ² ) is a vector of random residuals. The associated variance components, and the likelihood ratio of the two models were estimated with the DMU software (Madsen & Jensen, 2013), using restricted maximum likelihood (REML) methodology. REML likelihoods for nested models are only comparable when the fixed parts of the two models are identical, and the SNP substitution effect was therefore defined as random. The likelihood ratio test was performed as follows: where lnL ₀ and lnL ₀ are the REML log likelihoods of the H ₀ and Hi models, respectively. The likelihood ratio testing was done locus by locus, utilizing parallel computing procedures.

In order to correct for multiple testing in a very strict manner, the threshold for declaring significance in the test for association between SNP genotypes and IPN-resistance was divided by 50,000 (the approximated number of high-quality, polymorphic SNPs), i.e. a Bonferroni correction was applied. Thus, an experiment-wide p-value threshold for 0.05 was translated to a p-value threshold of 10 ^"6 for each individual SNP. In other words, the null hypothesis (HO) stated that no QTL for IPN-resistance was to be found in the investigated material, the alternative hypothesis stated that at least one QTL for IPN-resistance existed in the investigated material, the probability of observing at least one QTL was 0.05 only (5 %) if the null hypothesis was true, and an individual SNP needed a p-value below 10 in order to be declared experiment-wide significant.

Linkage maps were produced using the software Lep-MAP (Rastas et. al. 2013). Initially, SNPs were placed into linkage groups through twopoint analysis using the module 'SeparateChromosomes', specifying a LOD threshold of 110 (lodLimit = 1 10), together with the parameters missingl_imit=5, achiasmaticMeiosis=0, dataZTolerance=2, malePrior=0.1 , femalePrior=0.1 dataTolerance = 0.05 sizeLimit = 20 (see program options for full description of parameters for this and following steps). Subsequently, unlinked SNPs were added to each group using the module 'JoinSingles', specifying a LOD threshold of 30 (lodLimit = 30) and requiring a minimum LOD difference of 10 between candidate linkage group placements (lodDifference = 10), together with the parameters achiasmaticMeiosis = 0, dataZTolerance = 2, malePrior = 0.1 , femalePrior = 0.1 , dataTolerance = 0.05. Ordering of SNPs in each group was initially performed using the module 'OrderMarkers2' (four iterations), with the parameters missingLimit = 5, achiasmaticMeiosis = 0, nonNearldenticalLimit = 2 0.01 , missingClusteringLimit = 0.01 , hammingClusteringLimit = 0.001 , filterldenticalSubset = 25 2, dataZTolerance = 2, initError = 0.005, initRecombination = 0.0001 0.001 , alpha = 1 , MAFLimit = 0.05, informativeFamilyLimit = 3. Following initial ordering, markers with error rates greater than 0.01 were removed. A final evaluation of this corrected SNP order was carried out using 'OrderMarkers2' (four iterations) and specifying 'improveOrder = 1' in addition to the same parameters used for initial ordering. Chromosome numbers were assigned to the resulting linkage groups according to Phillips et al. (2006). Male and female linkage maps were produced, based on recombination events observed in males and females, respectively.

The SNP sequences, i.e. 71 bp DNA sequences centered on the SNPs, were aligned against a reference sequence for the rainbow trout genome (Berthelot et al. 2014; GenBank reference id of sequence: CCAF010000000). For this, BLAST+ (Aitschui et aL 1990, Camacho et al. 2008) was used, with parameters expect = 0.1 , match score = 1 , mismatch score = -2, gap- open penalty = 0, gap-extend penalty = 0. Two input sequences were used for each 71 bp sequence, one for each variant (allele) of the SNP. The CCAF010000000 sub-sequence having the highest BLAST score was accepted as the sub-sequence harbouring the SNP, provided that there were no more than two mismatches between the sub-sequence and the best-fitting of the two 71 bp sequences corresponding to each SNP.

Results

Among the 57,501 SNPs tested for association to IPN-resistance, five SNPs fulfilled the requirement of having p-values below 10 ^"6 , the requirement needed in order to declare experiment-wise statistical significance. As can be seen from Figure 1 , all of these five SNPs are located on one and the same chromosome, namely chromosome 1 following the nomenclature of Palti et al. (201 1). Furthermore, as can be seen in Figure 1 , chromosome 1 harboured a large fraction of the SNPs that were individually, but not experiment-wise significant (here, defined as SNPs having p-values below 0.01). As can be seen from Figure 2, the SNPs on chromosome 1 most strongly associated with IPN-resistance were localised to a sub-region of the chromosome, centred on the most significant SNP. The clustering of significant SNPs within a relatively narrow region of the chromosome indicates strongly that the significantly IPN-associated SNPs are markers for one and the same QTL. Eighty-two SNPs were individually or experiment-wise significant in the test for association with IPN- resistance, while also being located on chromosome 1. Alignment of the DNA sequences pertaining to these SNPs against the rainbow trout genome sequence available in GenBank (Bertheloet et al. 2014; GenBank reference id of sequence: CCAF010000000) revealed that the SNPs resided within a limited number of genome contigs or scaffolds (Table 1).

At any of the significant SNPs, rainbow trout having different SNP genotypes are expected to differ from each other in terms of resistance to IPN. For example, at the most significant SNP, the SNP having Affymetrix SNP identifier AX-89929954 (SNP #1 , Table 1), groups of trout homozygous for the allele conferring relative resistance to IPN are expected to have mean survival rates of 45 % under conditions similar to the conditions of challenge test 1 (considering only the individuals that were genotyped). In contrast, groups of trout homozygous for the allele not conferring relative resistance to IPN are expected to have mean survival rates of 17 % under similar conditions (considering only the individuals that were genotyped), whereas groups of individuals heterozygous at the SNP are expected to have mean survival rates of 36% under similar conditions (considering only the individuals that were genotyped) (see Table 3). Thus, the SNP AX-89929954 can be used as a tool for predicting the level of resistance to IPN of any individual. Here, level of resistance is defined as the level of relative resistance, meaning that an individual will be more resistant to IPN the more copies of the IPN-resistance allele the individual carries at AX-89929954. More precisely, an individual carrying one copy of the IPN-resistance allele (which is cytosine) is expected to be more resistant to IPN than an individual carrying no alleles of the IPN-resistance allele at AX- 89929954, given that other determinants of the individuals' resistance to IPN are similar in the two individuals. Similarly, an individual carrying two copies of the IPN-resistance allele at AX- 89929954 are expected to be more resistant to IPN than an individual that carries one copy of the IPN-resistance allele at AX-89929954, given that other determinants of the individuals' resistance to IPN are similar in the two individuals. Thus, genotypes at AX-89929954 can be used in order to predict the IPN-resistance of an isolated rainbow trout and in a population of rainbow trouts. Also, since an individual is more likely to pass on (to its offspring) a copy of the IPN-resistance allele at AX-89929954 the more copies of the IPN-resistance allele it carries, genotypes at AX-89929954 can also be used in order to predict the level of IPN-resistance in offspring of an individual. By selecting animals that carry one or two copies of the IPN- resistance allele at AX-89929954 as parents, one may select for higher degrees of IPN resistance in the next generation.

The other SNPs that are individually or experiment-wise significant SNPs, detailed in Table 1 , share with AX-89929954 the ability to predict levels of IPN resistance, as can be seen in Table 1 and in Table 3. Furthermore, these SNPs can be used in combination, for example in combinations of two SNPs, in order to form even more powerful predictive tools. Table 3: Survival rates within groups of fish from among the genotyped fish from challenge test 2. Each group consists of all genotyped fish having the genotype in question at the SNP in question. R = IPN resistance allele; A = non-1 PN resistance allele; AA. AR, and RR = the three possible genotypes at any particular SNP; NA = not applicable (because no individuals had the genotype in question at the SNP in question). The survival rates are the mean survival rates (± standard error) within the group of animals having the genotype in question at the SNP in question.

AX-89937020 0.00017884 0.16 ±0.01 0.3 ±0.01 0.37 ±0.03

AX-89924837 0.00021198 0.21 ±0.01 0.36 ±0.01 0.3 ±0.12

AX-89958601 0.00025353 0.17 ±0.01 0.3 ±0.01 0.37 ±0.03

AX-89923477 0.00031093 0.07 ±0.03 0.22 ±0.01 0.3 ±0.01

AX-89959350 0.00031728 0.07 ± 0.03 0.22 ±0.01 0.3 ±0.01

AX-89929482 0.00032841 0.11 ±0.02 0.23 ±0.01 0.31 ±0.01

AX-89937712 0.00033084 0.2 ±0.01 0.33 ±0.01 0.4 ± 0.04

AX-89949602 0.0003479 0.08 ±0.01 0.27 ±0.01 0.33 ±0.02

AX-89925103 0.00038971 0.21 ±0.01 0.32 ±0.01 0.41 ± 0.04

AX-89938051 0.00041583 0.21 ±0.01 0.35 ±0.01 0.32 ±0.06

AX-89924174 0.00050314 0.21 ±0.01 0.35 ±0.01 0.31 ±0.06

AX-89936461 0.0005141 0.18 ±0.01 0.33 ±0.01 0.26 ±0.03

AX-89916703 0.00067347 0.11 ±0.01 0.27 ±0.01 0.32 ±0.01

AX-89935317 0.00074987 0.1 ±0.02 0.25 ±0.01 0.32 ±0.01

AX-89966423 0.00085343 0.1 ±0.01 0.3 ±0.01 0.28 ±0.02

AX-89933348 0.00106426 0.16 ±0.02 0.26 ±0.01 0.3 ±0.01

AX-89969315 0.00107414 0.18 ±0.01 0.26 ±0.01 0.38 ±0.02

AX-89919958 0.00113481 0.07 ± 0.02 0.25 ±0.01 0.31 ±0.01

AX-89968417 0.00123226 0.02 ±0.02 0.2 ±0.01 0.3 ±0.01

AX-89946851 0.00135127 0.18 ±0.01 0.31 ±0.01 0.34 ±0.03

AX-89976917 0.00143634 0.18 ±0.01 0.26 ±0.01 0.37 ±0.02

AX-89945446 0.00154415 0.1 ±0.02 0.25 ±0.01 0.32 ±0.01

AX-89919457 0.00154766 0.21 ±0.01 0.36 ±0.02 0.31 ±0.04

AX-89973597 0.00155033 0.2 ±0.01 0.28 ±0.01 0.37 ±0.03

AX-89938138 0.00159849 0.12 ±0.03 0.21 ±0.01 0.3 ±0.01

AX-89971866 0.00223949 0.02 ±0.02 0.21 ±0.01 0.29 ±0.01

AX-89958882 0.00228346 0.18 ±0.01 0.3 ±0.01 0.31 ±0.02

AX-89961273 0.00249722 0.02 ±0.02 0.21 ±0.01 0.29 ±0.01

AX-89944901 0.00262016 0.18 ±0.01 0.34 ±0.01 0.35 ±0.03

AX-89919465 0.00282048 NA 0.41 ± 0.02 0.23 ±0.01

AX-89959425 0.00298056 0.14 ±0.01 0.3 ±0.01 0.37 ±0.02

AX-89917102 0.00323292 0.15 ±0.02 0.26 ±0.01 0.3 ±0.01

AX-89959281 0.00425635 0.23 ±0.01 0.4 ±0.02 0.5 ±0.2

AX-89916766 0.00451942 NA 0.41 ± 0.02 0.23 ±0.01

AX-89920507 0.00457228 NA 0.41 ± 0.02 0.23 ±0.01

AX-89957370 0.00460351 0.2 ±0.01 0.3 ±0.01 0.26 ±0.02

AX-89934009 0.00463068 0.13 ±0.01 0.27 ±0.01 0.33 ±0.02

AX-89929663 0.00493969 0.14 ±0.01 0.31 ±0.01 0.32 ±0.02

AX-89952300 0.0052556 NA 0.41 ± 0.02 0.23 ±0.01

AX-89916572 0.00571541 0.2 ±0.01 0.29 ±0.01 0.37 ±0.03

AX-89946911 0.00574551 0.13 ±0.02 0.24 ±0.01 0.32 ±0.01

AX-89974593 0.00611967 0.12 ±0.03 0.23 ±0.01 0.29 ±0.01 AX-89927158 0.00627456 NA 0.38 ±0.02 0.23 ±0.01

AX-89970383 0.00628358 0.24 ±0.01 0.37 ±0.02 0.64 ±0.12

AX-89965404 0.00638481 NA 0.41 ± 0.02 0.23 ±0.01

AX-89955634 0.00639828 NA 0.41 ± 0.02 0.23 ±0.01

AX-89932926 0.00657013 0.13 ±0.02 0.25 ±0.01 0.31 ±0.01

AX-89941493 0.00675854 0.19 ±0.02 0.27 ±0.01 0.3 ±0.02

AX-89943031 0.0067705 0.12 ±0.03 0.21 ±0.01 0.31 ±0.01

AX-89957682 0.00689041 0.09 ± 0.03 0.24 ±0.01 0.29 ±0.01

AX-89960611 0.00728331 0.17 ±0.01 0.33 ±0.01 0.35 ±0.02

AX-89950199 0.00747825 0.19 ±0.02 0.27 ±0.01 0.3 ±0.02

AX-89928407 0.00764258 0.08 ± 0.02 0.24 ±0.01 0.3 ±0.01

AX-89962035 0.00770092 NA 0.41 ±0.02 0.23 ±0.01

AX-89931951 0.00796054 0.21 ±0.01 0.36 ±0.02 0.29 ± 0.04

AX-89976536 0.00852971 0.21 ±0.01 0.36 ±0.01 0.29 ± 0.04

AX-89916801 0.00898601 0.02 ±0.02 0.22 ±0.01 0.28 ±0.01

AX-89929085 0.0094422 0.02 ±0.02 0.22 ±0.01 0.28 ±0.01

AX-89925267 0.0099745 0.2 ±0.05 0.22 ±0.01 0.29 ±0.01 chrl_7515539 3.10E-07 0.18 ±0.01 0.37 ±0.02 0.38 ±0.05 chrl_7108873 4.56E-07 0.18 ±0.01 0.36 ±0.02 0.45 ± 0.08 chrl_6864558 4.56E-07 0.18 ±0.01 0.36 ±0.02 0.45 ± 0.08 chrl_7186663 9.66E-07 0.18 ±0.01 0.36 ±0.02 0.45 ± 0.08 chrl_6730531 1.26E-06 0.18 ±0.01 0.33 ±0.02 0.34 ± 0.04 chrl_27891953 1.38E-06 0.22 ±0.01 0.31 ±0.02 0.66 ±0.06

AX-89953259 1.59E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_6740481 1.76E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_6770611 1.76E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_7412807 2.16E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7360179 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7411803 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7431445 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7433199 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7441254 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7441877 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7533570 2.18E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_6834898 2.19E-06 0.18 ±0.01 0.32 ±0.02 0.33 ±0.04 chrl_6730142 2.23E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_6746052 2.23E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_6794061 2.23E-06 0.18 ±0.01 0.33 ±0.02 0.33 ±0.04 chrl_7399212 2.95E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7442637 3.02E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7358019 3.11E-06 0.18 ±0.01 0.36 ±0.02 0.38 ±0.05 chrl_7709828 3.45E-06 0.2 ±0.01 0.3 ±0.01 0.77 ± 0.07 chrl_7598090 5.65E-06 0.19 ±0.01 0.36 ±0.02 0.38 ±0.05 186 chrl_7626471 7.50E-06 0.19 ±0.01 0.37 ±0.02 0.38 ±0.05

187 chrl_7598743 7.56E-06 0.19 ±0.01 0.36 ±0.02 0.38 ±0.05

188 chrl_7670293 9.90E-06 0.19 ±0.01 0.36 ±0.02 0.38 ±0.05

189 chrl_7670561 9.90E-06 0.19 ±0.01 0.36 ±0.02 0.38 ±0.05

190 chrl_7647634 1.22E-05 0.19 ±0.01 0.36 ±0.02 0.38 ±0.05

191 chrl_7356089 2.28E-05 0.18 ±0.01 0.36 ±0.02 0.39 ± 0.04

192 chrl_8109044 3.84E-05 0.18 ±0.01 0.35 ±0.02 0.4 ± 0.04

193 chrl_10439048 4.96E-05 0.21 ±0.01 0.35 ±0.02 0.37 ±0.08

194 chrl_8142346 5.19E-05 0.19 ±0.01 0.36 ±0.02 0.4 ± 0.04

195 chrl_8092208 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

196 chrl_8138683 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

197 chrl_8139206 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

198 chrl_8139744 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

199 chrl_8140789 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

200 chrl_8141687 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

201 chrl_8154917 8.17E-05 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

202 chrl_7454708 8.74E-05 0.18 ±0.01 0.33 ±0.02 0.42 ± 0.04

203 chrl_7504847 8.74E-05 0.18 ±0.01 0.33 ±0.02 0.42 ± 0.04

204 chrl_7505686 8.74E-05 0.18 ±0.01 0.33 ±0.02 0.42 ± 0.04

205 chrl_7505817 8.74E-05 0.18 ±0.01 0.33 ±0.02 0.42 ± 0.04

206 chrl_8202031 8.96E-05 0.19 ±0.01 0.36 ±0.02 0.4 ± 0.04

207 chrl_8228173 8.96E-05 0.19 ±0.01 0.36 ±0.02 0.4 ± 0.04

208 chrl_8309469 8.96E-05 0.19 ±0.01 0.36 ±0.02 0.4 ± 0.04

209 chrl_8163977 8.96E-05 0.19 ±0.01 0.36 ±0.02 0.4 ± 0.04

210 chrl_27786931 9.68E-05 0.22 ±0.01 0.3 ±0.02 0.61 ±0.06

211 chrl_8194629 0.00010535 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

212 chrl_7505259 0.00010824 0.18 ±0.01 0.33 ±0.02 0.42 ± 0.04

213 chrl_8474659 0.00014238 0.19 ±0.01 0.35 ±0.02 0.39 ± 0.04

214 chrl_8282602 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

215 chrl_8306806 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

216 chrl_8341618 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

217 chrl_8343786 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

218 chrl_8345836 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

219 chrl_8350569 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

220 chrl_8402403 0.00014575 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

221 AX-89962103 0.00016979 0.35 ±0.02 0.26 ±0.02 0.13 ±0.02

222 chrl_8279302 0.00018144 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

223 chrl_8334901 0.00020083 0.19 ±0.01 0.35 ±0.02 0.4 ± 0.04

224 chrl_7561600 0.00023783 0.19 ±0.01 0.32 ±0.02 0.42 ± 0.04

225 AX-89956272 0.00026395 0.31 ±0.01 0.22 ±0.02 0.07 ± 0.03

226 chrl_7938827 0.00026777 0.2 ±0.01 0.3 ±0.02 0.44 ± 0.05

227 chrl_10810229 0.00029614 0.19 ±0.01 0.37 ±0.02 0.29 ± 0.05 228 chrl_ _11007071 0.00029787 0.19 ± 0.01 0.37 ± 0.02 0.29 ± 0.05

229 chrl_ _, 10884171 0.00029812 0.19 ± 0.01 0.37 ± 0.02 0.29 ± 0.05

Example 2: Creating rainbow trout with increased resistance to IPN

A tissue sample is taken from each potential parent, i.e. from each rainbow trout that is a candidate parent for the creation of the said trout with increased resistance to IPN. The tissue sample may be taken using any of several available techniques for non-invasive sampling from live trout. For example, the sample may be a piece of the trout's adipose fin, cut using scissors or a scalpel, or it may be a biopsy of muscle tissue, taken using a biopsy punch such as the 3.0 mm Biopsy Punch with Plunger (BPP-30F) from Brymill (Basingstoke, UK). The sample can also be a few scales collected using a forceps. Following sampling, the tissue samples should be frozen down immediately, and kept in a frozen state until DNA extraction, or alternatively placed in ethanol for long term storage in the freezer. Scale samples may be dried on a piece of paper before storeage. At the time of sampling, the potential parents must be physically tagged, using for example Passive Integrated Transponder (PIT) tags. Physical tagging will facilitate the later retrieval of the individuals selected using the method. DNA is extracted from the tissue sample, using any of several available methods for extracting high-quality DNA from trout samples. For example, DNA may be extracted using the DNAeasy kit from QIAGEN (Venlo, the Netherlands), following the protocol supplied with that kit.

The extracted DNA is genotyped for at least one of the single nucleotide polymorphisms (SNPs) specified in Table 1. For example, the extracted DNA may be genotyped using the SNP AX-89929954 (SNP #1). Genotyping may be performed using any well-established method for genotyping SNPs. For example, genotyping may be performed using the iPlex® protocol on the MassARRAY® system from Sequenom (San Diego, USA). For genotyping of SNP AX-89929954 using the iPlex protocol, these primers can be used:

Forward PCR primer: ACGTTGGATGTCCACAGTCCACATGCTTTG (SEQ ID NO: 157), Reverse PCR primer: ACGTTGGATGGGAAAGAAACAGTGATAGGC (SEQ ID NO: 158),

Extension primer: CACACAACTGTGTGTCAAAT (SEQ ID NO: 159)

All other experimental parameters are according to the iPlex protocol. The iPlex protocol may be applied on a multiplex of several SNPs, in which case experimental parameters, including the primer sequences, may have to be adjusted according to the properties other SNPs within the multiplex. These adjustments are made using the Assay Design Suite software from Sequenom (https://ww.mysequenom.com/Tools). The raw data from iPlex genotyping is processed using the Typer software from Sequenom. The genotyped samples will cluster into three distinct and well-defined clusters corresponding to the three genotypes, provided that all three genotypes are represented within the genotyped samples. Applying the steps laid out above, some of the genotyped trout may be found to have two copies of the cytosine (C) allele, while other may have two copies of the adenine (A) allele. Yet other may have one copy of each allele (AC). The parents having two copies of C (i.e. having genotype CC) will be selected as parents. The offspring of these parents will all be homozygous for allele C at SNP AX-89929954, meaning that they will all be homozygous (CC) for the allele associated with increased resistance to IPN. Under conditions similar to the conditions used in the experiment for challenge test 2 described in Example 1 above, such (CC) animals are expected to have a survival rate of 45 %, while animals originating from randomly selected parents will have an expected survival rate of 26 %.

If no individuals are found to have genotype CC, individuals with genotype AC may be selected as parents. If the parental candidates (i.e. the genotyped animals) were a random subset of the population from which they originated, using these AC animals as parents is also expected to produce offspring with increased resistance to IPN.

The method may be applied using any of the SNPs listed in Table 1. The method may also be applied using a combination of two or more SNPs. For example, one may genotype SNPs AX- 89929954 and AX-89918280 (SNP #2), and use as parents the individuals having genotype CC at AX-89929954 and genotype GG at AX-89918280.

Following the identification of parents using the method, these parents are retrieved by sorting them out from the tank wherein they are located (usually done while moving each fish over to another tank). Offspring are produced, and fertilised eggs are raised, using standard aquaculture methods.

Example 3: Validation experiments of the results underlying the Invention

Two additional challenge tests (Challenge test 3 and 4) were carried out, in order to validate the association between IPN resistance and alleles at the DNA-polymorphisms of the invention. The tests were carried out in two 100 liter tanks, and in each tank a group of rainbow trout individuals was tested for resistance against one of two strains of the IPN virus. The two strains were 1) a strain (AGT1 1-2) of serotype Sp isolated from Norwegian sea-water- reared rainbow trout; the same strain that was used in Example 1 , and 2) a strain of serotype Wb isolated from an IPN outbreak in rainbow trout in Chile. Each tank contained approx. 12 rainbow trout fry from each of 133 full-siblings groups. The same set of full-sibling groups were used in both tests. The test was carried out 1 week after first feeding (i.e. after transition to solid feed). The fish were acclimatised and start-fed at the test site. At the commencement of the tests, the water volume was reduced to ½ the original volume, whereupon 100 ml of the respective virus isolate was added to each tank, in order to obtain a final concentration equal to a TCID ₅₀ of 10 ⁵ virus particles per ml of water. Three hours after addition of virus, the water volume was returned to the pre-challenge level (aeration of the water was maintained during these three hours). Mortalities were sampled and recorded two times a day throughout the test period. DNA was extracted from sampled test fish, using a standard protocol. Both tests were terminated 28 days after test start. At that time, the daily mortality rates were 0.9 % (Sp) and 0.19 % (Wb), and decreasing. In contrast, at the peak of the mortality curve, daily mortalities had been 10.1 % (Sp) and 1.56 % (Wb). In other words, at the termination of the tests, the survival curve had flattened out, and it is reasonable to assume that most of the fish that survived the test period would have survived also if the test period had been prolonged. The accumulated mortalities were 70.0 % (Sp) and 9.38 % (Wb). All animals from the Sp test (1603 animals) and all mortalities from the Wb test (174 animals) were sampled and genotyped for four of the DNA polymorphisms of the Invention. Genotyping was performed using the iPLEX genotyping system from Agena Bioscience (San Diego, USA) (the iPLEX system was formerly owned by Sequenom, San Diego, USA). PCR- and extension primers for iPLEX genotyping were designed using the Assay Design Suite v2.0 (available at

www.mvsequenom.com/Tools), using default settings and all four DNA polymorphisms were genotyped in one and the same multiplex reaction. As can be seen in Table 4, frequencies of the alleles designates as IPN-resistance alleles were significantly higher in the survivors from the Sp test than in mortalities from the Sp test, for all four polymorphisms. Similarly, frequencies of the alleles designated as IPN-resistance alleles were significantly higher in the survivors from the Wb test than in the mortalities from the Wb test. Here, statistical

significance was tested by applying a logistic regression of the number of IPN-resistance alleles on the binary survival/non-survival, for each polymorphism. Table 4 contains the p- values from this test, for all four polymorphisms. For the Wb test, where only mortalities were recorded, genotype counts among the 1416 survivors were estimated by assuming that overall allele frequencies were the same in the Wb test as in the Sp test (a reasonable assumption, given that the two challenge tests contained animals from the same families, in the same proportions), and by further assuming that each polymorphism was in Hardy-Weinberg equilibrium. The validation experiment confirmed that a statistically significant association exists between IPN resistance and alleles at all four investigated polymorphisms. Furthermore, the association was valid also when the IPN virus strain used in the initial discovery of the Invention (a strain of serotype Sp) was replaced with a different strain (of serotype Wb, West Buxon). It follows that the association between DNA polymorphisms and IPN resistance is reproducible and independent of virus strain.

It is a natural and necessary consequence of these findings that the DNA polymorphisms of the Invention may be used in order to create rainbow trout with increased resistance to IPN. For example, one may use DNA polymorphism AX-89929954in order to screen a number of rainbow trout individuals. Having identified one male one female which are both homozygous for the IPN-resistance allele (i.e. they both have genotype CC), these two animals may be mated, and all offspring coming from that mating will have genotype CC according to the rules of Mendel. These individuals will be expected to be more resistant to IPN than random (but otherwise comparable) individuals coming from the same population of rainbow trout, provided that the mortality allele (A in the case of AX-89929954) also exists in the population.

Table 4: Results from experiment validating the association between IPN-resistance and the polymorphisms of the Invention. For each of four polymorphisms, the table contains: 1) the identity of the resistance- and mortality alleles (as defined in Table 1 and in Table 2), 2) counts of animals having either of the three possible genotypes, within the subgroups of Sp survivors (SP_SURV), So mortalities (SP_MORT), and Wb mortalities (WB_MORT), 3) p-values from the regression of number of IPN-resistance alleles on the binary trait survival/non-survival.

*The counts for WB SURV were estimated as described above.

Example 4: Identification and testing of additional SNPs associated with IPN resistance

Twelve individual rainbow trout from AquaGen's population of rainbow trout were whole- genome sequenced using HiSeq2000 from lllumina (San Diego, USA); see Palti et al. (2015). Sequence reads originating from these 12 animals were aligned to the publicly available reference genome sequence for rainbow trout (Berthelot et al. 2014), using bowtie2

(Langmead and Salzberg, 2012). Prior to alignment of the lllumina sequence reads, the subsequences (scaffolds and contigs) of the reference sequence were merged and ordered by the co-alignment of sub-sequences to Atlantic salmon chromosome sequences (submitted to GenBank); the two species are closely related and display a large degree of synteny. From the aligned sequence reads, SNPs were identified using freebayes (Garrion and Marth, 2012). The set of (putative) SNPs was filtered in freebayes using the following parameter string: "-- no-indels -no-mnps -no-complex -min-mapping-quality 30 -read-mismatch-limit 2 -read- indel-limit 1". For each filtered SNP, genotypes in the 12 sequenced animals were deduced using freebayes. The genotypes were compared to genotypes at one of the original SNPs of the Invention (AX-89929954), calculating for each filtered SNP the square of the correlation coefficient between that SNP and AX-89929954. The square of the correlation coefficient (r ² ) between two DNA polymorphisms is a measure of the amount of linkage disequilibrium between the DNA polymorphisms; the higher r ² , the more correlated genotypes at the two DNA polymorphisms are. Noting that high levels of r ² was predominantly observed for DNA polymorphisms that was no more than 3 million base pairs (3 Mb) distant from AX-89929954, most SNPs that were more than 3 Mb from AX-89929954 was removed, as were all SNPs having an r ² value lower than 0.2. Furthermore, SNPs having r ² values above 0.5 were prioritized, as were SNPs no more than 500 bp from a gene region (a gene region was defined as a region containing a BLASTN hit, when BLASTN was run against the most recent version of the RefSeq-RNA database, with default BLASTN parameter values). In the end, a subset of 500 SNPs was selected, and genotyped using KASP chemistry, implemented through the SNPIine system from LGC Genomics (http://www.lqcqroup.com/products/qenotypinq- instruments/snpline/#.VkNMKLcvdhE). Genotyping was done on the same genetic material as described in Example 1 (1723 animals from an IPN challenge test), and associations between genotypes and IPN resistance were tested for in the same manner as described in Example 1. Individual SNPs displaying chi-sguare-distributed test statistics larger than 13.0 were defined as being so strongly associated to IPN, they could be used as tools for selecting IPN resistant animals. In Figure 3, the negative of the logarithm of p-values (HO: genotypes are not associated with IPN resistance, H1 : genotypes are associated with IPN resistance) are plotted against positions on the "physically ordered" rainbow trout reference genome, for all DNA polymorphisms tested either as part part of the experient described in Example 1 or as part of the validation study described here. The figure illustrates that the polymorphisms most strongly associated to IPN resistance are all located within a narrow region, meaning that the most likely position of the causative DNA polymorphisms underlying the QTL is relatively well defined, and that any other DNA polymorphisms located within the QTL region (the "peak region" of the graph), if associated with IPN, are likely to be markers for one and the same underlying causative mutation. Certain references cited in the application

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