Fatty Acid Status of Freshwater Resident and Anadromous Forms of Young Brown Trout (Salmo trutta L.)
S. A. MURZINA, Z. A. NEFEDOVA, S. N. PEKKOEVA, A. E. VESELOV, M. A. RUCH’EV, N. N. NEMOVA
Institute of Biology of Karelian Research Centre, RAS, 185910, Petrozavodsk, Pushkinskaya str., 11
Keywords: молодь кумжи, экологические формы, жизненная стратегия, липиды, жирные кислоты, young fish, brown trout, ecological forms, life strategy, lipids, fatty acids
Abstract
No qualitative and quantitative differences in the profiles of fatty acids of their main groups between freshwater resident (the Orzega River, Onega Lake Basin) and anadromous (the Indera River, White Sea Basin) forms of young brown trout were found. The alterations in a rate of conversion of food derived 18:2ω-6 and 18:3ω-3 fatty acids into the long-chain and physiologically active - 20:4ω-6, arachidonic, and 22:6ω-3, docosahexaenoic, fatty acids were revealed. Freshwater residential young of brown trout (parr, at 3+ age) from the Orzega River were distinguished by higher index of 20:4ω-6/18:2ω-6. Anadromous form of the young of brown trout (smolts, at 4+ age) from the Indera River had higher ration of essential fatty acids - 22:6ω-3/18:3ω-3 and of polyunsaturated fatty acids - ω-3 to ω-6. The latter correlated with higher weight-length characteristics of the studied individuals.
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