Polyunsaturated Fatty Acid Content in the Muscles of Alien Fish Species of the Rybinsk Reservoir

Abstract The biochemical composition of the muscles two fish species, European smelt Osmerus eperlanus and Common (Caspian) kilka Clupeonella cultriventris , that were successively invaded naturalized in Rybinsk Reservoir second half 20th century, differs significantly fatty acid content. sum content (mg/g) eicosapentaenoic (20:5n-3) docosahexaenoic (22:6n-3) polyunsaturated acids muscle tissue is almost four times higher than smelt. Given are similar their ecological morphological characteristics do not differ diet Reservoir, it obvious observed differences primarily result from phylogenetic aspect. obtained data on invaders show replacement one alien species with another (European kilka) changed quality production an important link trophic web reservoir.