The expression of genes encoding transcriptional myogenic regulatory factors (MRF) in muscles, and the activity of enzymes involved in energy and carbohydrate metabolism in the liver and muscles of rainbow trout Oncorhynchus mykiss Walb., grown under 24-hour lighting and fed at night in aquaculture conditions in one of the southern regions of the Russian Federation for seven months, were studied. The results of the study showed that this regime, introduced into the standard technology of trout growing, had a beneficial effect on its condition and growth. By the end of the study, trout individuals grown under the experimental regime differed from the control variants in having higher expression levels of the MRF genes (myod1, myf5, mlc2, mstn1a) and increased activity of pyruvate kinase and cytochrome c oxidase in the liver. It can be assumed that the introduction of additional lighting and feeding at night into the technology of trout cultivation stimulates aerobic metabolism, promotes the intensification of muscle growth processes in trout individuals and, in general, has a positive effect on the fish organism condition.
M. A. Rodin (Wed,) studied this question.