The biochemical variability of the lipid status of juveniles of the brown trout Salmo trutta L. inhabiting rivers belonging to the watershed area of the White Sea

Abstract

The lipid status of juveniles of different ages (0+, 1+, 2+, and 4+) has been studied for the brown trout inhabiting the Ol’khovka and Indera rivers (the White Sea watershed area). A higher lipid status (due to particular lipid classes) has been registered for the young-of-the-year compared to older age groups; these differences were preconditioned by the quality and the quantity of the food sources. Age-dependent metabolic activity may also affect the quantitative differences, including variations in the particular groups of lipids, in juveniles of the brown trout of various ages, especially in smolts.