The Influence of Different Lighting and Feeding Regimes on the Activity of Metabolic Enzymes in Farmed Atlantic Salmon Fingerlings

Abstract—The influence of constant and natural lighting modes in combination with different feeding rations on the activity of energy and carbohydrate metabolism enzymes in the muscles and liver of salmon fingerlings artificially grown in aquaculture in the conditions of the southern region of Russia was investigated. The revealed intergroup differences in the activity of the studied enzymes in fingerlings indicate differences in the level of energy metabolism and the use of carbohydrates in the processes of ATP synthesis and other biosynthesis pathways in muscles and liver depending on lighting conditions, including in combination with the feeding regime. The high level of aerobic metabolism in the muscles and the increased use of carbohydrates in glycolysis in the liver of fish in salmon fingerlings raised under constant light corresponded to their highest average weight gain. In individuals from all experimental groups, changes in the activity of the studied enzymes were found depending on the time after the start of the experiment, indicating an increase in the levels of aerobic and anaerobic metabolism in muscles and glycolysis in the liver necessary for the implementation of biosynthesis processes.