LIPID PEROXIDATION AND ANTIOXIDANT SYSTEM IN THE SKIN OF FRESHWATER FISH DEPENDING OF THE SEASON
N. P. Oleksiuk
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Institute of Animal Biology NAAS, Lviv 79034, st. Stus 38, Ukraine
Lipid peroxidation and antioxidant system in the skin of different species freshwater fish in various seasons were studied. Three types of fish — common carp (Cyprinus carpio L.), silver carp (Hypophthalmichthys molitrix) and grass carp (Ctenopharyngodon idella) were selected for studies. Samples of fish skin tissue were collected after decapitation in early spring (March), summer (in June), autumn (September) and winter (December). The content of lipid peroxidation products (diene conjugates, lipid hydroperoxides, TBARS) and the activity of antioxidant enzymes (superoxide dismutase, glutathione peroxidase and catalase) were determined. It was established that lipid peroxidation and antioxidant system of the fish skin depends on the season and species of fish. The content of lipid peroxidation products in the skin of freshwater fish in the early spring period was significantly higher than their content at the beginning of the summer and autumn periods, wich indicates an increase of lipid peroxidation in fish organism in winter and early spring periods. Superoxide dismutase and glutathione peroxidase activity in the skin of silver carp and common carp in early spring was significantly lower than at the beginning of the summer and autumn periods. Catalase activity in the grass carp skin during the annual cycle of growing is unchanged. The seasonal changes of glutathione peroxidase and catalase activity in the skin of silver carp and common carp were opposite direction.
Keywords: LIPID PEROXIDATION, ANTIOXIDANT ENZYMES, COMMON CARP, SILVER CARP, GRASS CARP, SKIN, SEASON
