Application of feed additives obtained from fish roe and glycerin in trout diet

These studies were carried out in the Rostov region on the replacement and broodstock of amber trout in the second and fourth stages of maturity. The purpose of the work: to study the effect of newly developed feed additives from pond fish milt and glycerin on the performance of salmon fish. As part of achieving this goal, it is necessary to solve the following tasks: to analyze various proportions of pond fish milt and glycerin; carry out feeding of salmon fish from the second to the fourth stage of maturity; study the growth rates of fish. According to the scheme of the experiment, the first (control) group of fish received complete feed without additives. In the complete feed for the second experimental group, 2% glycerol was included by weight of the feed. The diet for trout of the third group included pond fish milt with glycerol 50 to 50% in the amount of 2.0% by weight of the feed. In the second stage of maturity, a significant increase in gross growth in the second and third groups by 13.5% and 14.4% (P<0.01) was found in relation to the control group. There was also a tendency to increase the length of the body in the experimental groups by 0.7 and 0.6 cm, respectively. The highest coefficient of fatness was in the group with 2% glycerol (6.97%). In the fourth stage of maturity, the trend towards a significant increase in gross growth continued. In the second experimental group, this indicator was higher than the control by 18.2% (P<0.01) and by 17.1% (P<0.01) in the third. The fatness coefficient in the control group was 1.74, in the second group it was significantly higher by 5.2% (P<0.01).