Activity of lysosomal hydrolases in juvenile trout (Salmo trutta L.) from the subpolar river Ol’hovka

The dynamics of the activity of lysosomal enzymes (cathepsins B and D, DNAse and RNAse) in young salmon trout Salmo trutta L. (0+, 1+, 2+, 3+ and 4+) collected during the summer (June, 2015) from the Ol’khovka River, located on the Tersky Coast of the Kola Peninsula (the White Sea basin) was studied. It is shown that the dynamics of the activity of lysosomal hydrolases in juvenile trout during the river period of life points to a correlation between the specific activity (per mg protein) and the growth and development stage of juveniles. Relatively high values of the studied enzymes were found in the young’s-of-the-year (0+).The activity of lysosomal hydrolases was studied in the liver and muscles of trout juveniles (1+, 2+, 3+ and 4+) and the highest enzyme activity values (except DNAse) were detected in the liver. These results indicate that the lysosomal enzymes are involved in compensatory transformations of the nucleic metabolism and in closely related protein metabolism during the growth and development processes of these salmonids, especially when leaving their spawning nests (0+).