FIELD: fishery, in particular, increasing viability of young fish and fishlike organisms. SUBSTANCE: method involves adding biologically active substance into water medium; holding fish and fishlike objects in obtained solution for 1-1.5 hour, with solution concentration being within the range of 10-50 mg/l. Biologically active substance may be produced by lyophilization of acid extract of pineal gland tissue. EFFECT: increased resistance of objects to stress factors of different nature. 4 tbl
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