Activity of Enzymes of Energy and Carbohydrate Metabolism in the Organs of Pink Salmon Oncorhynchus gorbuscha (Salmonidae) during Spawning Migration

AbstractThe article presents the results of the study of the activity of key enzymes of energy and carbohydrate metabolism in pink salmon Oncorhynchus gorbuscha spawners during spawning migration from the estuary to the river. A decrease in the activity of carbohydrate metabolism enzymes (lactate dehydrogenase and pyruvate kinase), 1-glycerophosphate dehydrogenase in red muscles and liver, as well as cytochrome c oxidase and aldolase in white muscles in fish at the river stage of the migration route has been shown. Relatively higher values of cytochrome c oxidase activity in gills, glucose-6-phosphate dehydrogenase in red muscles, and aldolase in the liver were found in fish caught in the river. Apparently, as pink salmon spawners move to spawning grounds, metabolic changes occur associated with the redistribution of substrates towards increased use of lipids and proteins of muscle tissue to provide energy for the process of osmoregulation, high physical activity and reproductive function under conditions of complete exogenous starvation.