PURPOSE: To reduce consumption of an electric power for lowering cost by dividing an electric screen setting area to form each of the electric screens in only case of detecting fishes access to each electric screen setting area by means of each fish-finder.
CONSTITUTION: An electric screen setting area is divided in plural, two e.g., to be provided in the sea with sensor elements Sa and Sb for fish-finders 7a and 7b respectively which detect fishes entering into fish detecting areas 6a and 6b adjacent to the side of a fish breeding farm 1 in each of both setting areas. In case that the fishes in the fish breeding farm 1 approach to the electric screen setting areas 4a and 4b and enter into the fish detecting areas 6a and 6b, each of the fish-finders 7a and 7b detects a group of fishes to form electric screens 4a and 4b respectively. Thus, less consumption of an electric power and lower cost is realized.
SUYAMA HIROYUKI
DAIKU HIROYUKI
ARAI HIROSHIGE
TSUKAHARA MASANORI
OTANI SEIJI
