Use of feed additive “Enzimsporin” in second year rainbow trout growing

One of the problems of the feed industry is still unresolved issues in the field of the use of irreplaceable biologically active feed substances in feed for aquaculture facilities. The article discusses the experience of using astaxanthin in sterlet feeding. The study of the effect of astaxanthin on the morphophysiological state of fish, allows us to develop highly effective recipes for compound feeds for valuable species of aquaculture. Astaxanthin has a unique molecular structure that allows it to be both inside and outside the cell membrane at the same time. This is what provides better cell protection compared to beta-carotene and vitamin C. This powerful antioxidant has a huge impact on the work of all systems and overall health, but this practice has not affected valuable objects of aquaculture. The effect of astaxanthin on the physiological status of sturgeon fish has not been studied. It was found that the addition of astaxanthin — 20.0 and 40.0 mg/kg to the composition of production feeds allowed to increase productivity by 1.9 and 2.3 times, respectively. The indicators of energy metabolism also indicate a better accumulation of plastic substances in the fish of the experimental groups: hemoglobin in the variants with the addition of astaxanthin in the feed was 77.4 and 71.3 g/l, which is 17.6 and 8.4% higher than in the fish of the control group, in the same variants of the study, in comparison with the control sample, the level of total protein was significantly higher by 17.4 and 22.2% (p < 0.05). Thus, it can be said that the antioxidant astaxanthin provided more favorable trophic and biochemical conditions necessary, in particular, for the normal growth and development of fish.