Activity of energy and carbohydrate metabolism enzymes in rainbow trout (Оncorhynchus mykiss Walb.) with the introduction of 24-hour lighting in aquaculture conditions of the Southern region of the Russian Federation

The activity of energy and carbohydrate metabolism enzymes (cytochrome c oxidase, pyruvate kinase, glucose-6-phosphate dehydrogenase, glycerophosphate dehydrogenase, lactate dehydrogenase, aldolase) was studied in rainbow trout Oncorhynchus mykiss Walb. grown in aquaculture conditions at an enterprise in North Ossetia-Alania under a regime including 24-hour lighting and night feeding. According to the results of the study, the activity of cytochrome c oxidase and pyruvate kinase in the liver of fish from the experimental group was significantly higher than in the control individuals, indicating an increase in the aerobic metabolism level of ATP synthesis. The activity of aldolase in the organs of fish grown under 24-hour lighting was lower compared to fish from the control group, indicating a decrease in the level of carbohydrate utilization in glycolysis in muscles and the intensity of gluconeogenesis in the liver. The differences revealed suggest that with the introduction of 24-hour lighting and night feeding, metabolic changes are observed in energy and carbohydrate metabolism, facilitating biosynthesis processes and, accordingly, an increase in fish weight.