To provide a method for managing artificial seeds in the production of the artificial seeds, accelerating the growth of them and providing efficiency and stabilization of the production of the artificial seeds by managing the growing water having an appropriate salt concentration in accordance with the kinds, properties and growing stages of the seeds i.e., fertilized eggs, fries or larvae to activate their physiological functions.

This method for managing the artificial seeds the production of the artificial seeds, when hatching the fertilized eggs, growing the seeds of marine fishes or migrating fishes or larvae of shell fishes, forming salt gradient layers in the growing water in an aquarium, hatching eggs by floating the fertilized eggs in a region having a salt concentration fitting with the specific gravity of the egg in the aquarium, and also growing the seeds or larvae; while selecting the salt concentration in accordance with the kinds, properties or growing stages of them. Especially, it is suitable for the growth management of the fries of coast-living marine fishes or downstream-migrating fishes.

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