Use of sorption feed additive in the feeding of young fish
The aim was to study the effect of feeding an active coal feed additive (ACFA) on biological indicators of fish grown in closed water supply installations. The experiment was carried out in a sturgeon farm in the Krasnodar Krai. The object of research was thorn juveniles. The experiments used the traditional technology of keeping and feeding sturgeon fish with combined starter feeds in closed-cycle installations. There were analyzed the physicochemical properties of water and the content of chemical substances in feed for sturgeon fish; the influence of the use of ACFA in feed on fish-breeding and biological indicators, growth rate, survival rate, feed costs, use of nutrients for products and the fatness coefficient of young fish, the effect of using ACFA on the development of muscle tissue, the chemical composition of the body of young fish and content of heavy metals. During the experiment, all water parameters in the closed water supply installation were stable and met the existing requirements. It was found that in the conditions of the studied farm, the use of ACFA in feeding juvenile sturgeon fish promotes an increase in body weight by 5.3-10.2% (P<0.01-0.001), in body condition coefficient - by 1.7-7.5% and a decrease in feed costs for products - by 5.0-8.9%. Сoncluded that the use of ACFA had a positive effect on the development of muscle tissue, increasing its protein content by 0.41-0.42% (P<0.05), fat content - by 0.16-0.32% (P<0.05), with a decrease in the content of heavy metals in the body of young sturgeon fish by 1.5-2.0 times.