UDC

597.552.1:591.111.05

Authors

Evgeniy G. Berestovskiy, Irina A. Erokhina*
*Murmansk Marine Biological Institute, Kola Scientific Center of the Russian Academy of Sciences (Murmansk, Russian Federation)

Abstract

The results of the study of physiological and biochemical parameters of pike Esox lucius L. from the tundra and forest-tundra lakes of the Kola Peninsula are presented in the paper. The studied fishes have a low growth rate. Gonad sizes are significantly less than the uniform in size specimens from a comfortable dwelling zone, which implies a low fecundity of pike in the studied basins. Fish feeding is characterized by small ration under conditions of plenty of available food. Amphipoda Gammarus laсustris form the basis of food of studied pikes. The paper considers the features of pike metabolism based on the study of the biochemical composition of blood and the level of energy substrates in tissues. The majority of the studied pikes in the tundra lakes have reddish muscles; and the level of total carotenoids in the average is 2-3 times higher than in fishes of the forest-tundra lakes. The proteins in all studied fishes are actively involved in the energy process by catabolism. The protein content in the blood serum of studied fishes, regardless of habitats, significantly exceeds this content of the inhabitants of rivers in the middle zone of Russia. The intensity of protein catabolism is higher in pikes from the tundra lakes than in fishes of the forest-tundra lakes. The differences in the accumulation of energy substrates in tissues are noted. The content of glycogen in the liver of pike in the forest-tundra lakes is 1,5 times higher than that in the tundra lakes. Pikes from the tundra lakes stock up lipids predominantly in the liver and muscles. Most likely, these differences are related to the food base characteristics of fish in the studied lakes.

Keywords

lake of the Kola Peninsula, metabolic adaptation of pike, pike biochemical blood composition, energy substrate in pike tissues

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