[Serum protein studies of the rainbow trout (S. irideus G.)]

The effect of the physiological state, age, sex, stage of sexual product, maturity and environmental conditions on the composition and dynamics of blood serum protein was followed in 625 brook trouts of varying age. The fish were bred in Karst water with temperature 9 degrees C. It was established that the quantity of blood serum total protein varies within the range of 2.03-3.80 g% and its level is highest in spring in the spring female producers (3.80 g%). In about 50% of the samples of varying age groups a prealbumen fraction, a dominating albumen fraction, three alpha-globulin, two beta-globulin, and one gamma-globulin fractions were established. Globulin quantity rose with age from 55.19 to 79.62% and the alpha/beta ratio showed values higher than 1 in age groups. Albumen quantity decreased with age by about 1/3, while the A/G coefficient was not higher that 1 and ranged from 0.29 to 0.94.