Сибирский экологический журнал, 2 (2016) 208219 УДК 57.045. 047:577.115:597.552.512 DOI 10.15372/SEJ20160205 The influence of season and levels of dietary lipid on growth performance and lipid composition in rainbow trout Parasalmo mykiss (Walbaum, 1792) O. B. VASILYEVA1, M. A. NAZAROVA2, P. O. RIPATTI1, N. N. NEMOVA1 1 Institute of Biology, Karelian Research Centre, RAS 185910, Petrozavodsk, Pushkinskaya str., 11 E-mail: vasil@krc.karelia.ru 2 Vologda State University 160035, Vologda, Leninа str., 15 Статья поступила 25.05.2015 Принята к печати 30.09.2015 ABSTRACT We studied the growth performance and liрid composition of liver, muscles and visceral fat in rainbow trout Parasalmo mykiss (Walbaum, 1792) and the diets used in its cultivation during the springsummer season. <...> The differences in dietary liрid composition determined modifications in the biochemical composition of tissues of rainbow trout and had an effect on the weight and growth rate of the fish. <...> Trophic and seasonаl factors also had their influence on the studied parameters. <...> The degree of influence depended on the functional characteristics of tissues and organs of rainbow trout. <...> Growth processes in aquatic organisms, especially at the early stages of their development, are largely determined by the trophic influence. <...> Among the environmental factors, dietary composition and the degree of food availability forms exogenous heterogeneity of fish. <...> Trophic chains are formed during the long process of coevolution, therefore biochemical composition of native feed objects is generally considered to be the most appropriate for nor208 mal growth and development of fish. <...> In trout farms fishes are cultivated on artificial feed, and feedstock for its production must be as close as possible to the nаtural food of rainbow trout. <...> However, intensive development of salmon aquaculture led to a deficit of the main liрid component in the feed fish oil that was replaced by vegetable oils [Barlow, 2000; Tacon, 2004]. <...> The presence of non-typical ingredients for the nаtural diet can have a significant effect on fish metabolism and, consequently, result in a change of functioning at all levels of organism organization (from the adaptive response to disease states). © Vasilyeva O. B., Nazarova M. А., Riрatti P. О., Nemova N. N. <...>