Characteristic features of energy metabolism in slender eelblenny Lumpenus fabricii from different bays of the White Sea

The study is concerned with the activity of cytochrome c oxidase (CO), lactate dehydrogenase (LDH), aldolase, 1-glycerophosphate dehydrogenase (1-GDDH) in the muscles and liver of slender eelblenny Lumpenus fabricii from Kandalaksha, Onega and Dvina Bays of the White Sea. The bays differ in trophic-ecological and hydrological conditions (temperature, salinity, flow patterns, bacterio- and phytoplankton productivity). The differences in the studied parameters of energy and carbohydrate metabolism in juveniles and mature individuals were established. It was revealed that the features of slender eelblenny metabolism from Onega and Kandalaksha Bays are associated with the differences in the level of aerobic energy metabolism in the muscles and liver; the individuals from the Dvina Gulf differed in the level of oxidation of carbohydrates in glycolysis. The observed variations in metabolic processes of the fish from different bays of the White Sea are indicative of the differences in their energy needs, aimed at the maintenance of energy homeostasis in specific hydrological, ecological and trophical conditions of the bays in focus.