Biochemical Heterogeneity on Lipid Status of Female Gonads of Prespawning Ping Salmon Oncorhynchus gorbuscha (Walbaum 1792) (the Varzuga River, White Sea Basin)
Z. A. NEFEDOVA, S. A. MURZINA, S. N. PEKKOEVA, T. R. RUOKOLAINEN, N. N. NEMOVA
Institute of Biology, 185910, Petrozavodsk, Pushkinskaya str., 11
Keywords: лососевые рыбы, горбуша, гонады, онтогенез, липиды, жирные кислоты, salmonids, pink salmon, gonads, ontogenesis, liрids, fatty acids
Abstract
A comparative analysis of lipid and fatty acids contents in certain portions of female gonads - front, central and tail - of prespawning pink salmon Oncorhynchus gorbusha was made. The heterogeneity of eggs was determined on the lipid status of certain portions of ovaries: in front portion - high level of physiologically important eicosapentaenoic 20:5 (n-3) and docosahexaenoic 22:6 (n-3) fatty acids, which coincided with higher intensity of lipid metabolism as evidenced higher ratio of 16:0/18:1(n-9); in central portion - low level of the general lipids due to phospholipids (including phosphatidylcholine, phosphatidylethanolamine, sphingomyelin) and cholesterol; and in tail portion - high amount of certain phospholipids (phosphatidylcholine, phosphatidylethanolamine, lysophosphatidylcholine, sphingomyelin, phosphatidylinositol). Heterogeneity found in certain portions of ovaries indicated asynchronism in biochemical processes in oocytes of these portions that might affect the ability of fertilization, growth and development of embryos and further differentiation of young fish.
|
