Study of microbiological complex use in growing sterbel fry

The aim of the study is to research the efficiency of using the microbiological complex BONAKA-APK-N in growing sterbel. Tasks: to determine the fish farming and biological parameters of growing sturgeon fry (sterbel); to establish feed consumption and costs per 1 kg of live weight gain of fish; to determine the composition of the intestinal microflora and blood serum of sturgeon fry when using the studied feed addi-tive; to calculate the economic efficiency of using the microbiological complex BONAKA-APK-N with a pro-biotic effect in aquaculture. The studies were conducted at Albashi LLC (Krasnodar Region) in accordance with standard fish farming methods in 2023. The object of the research is sterbel underyearlings kept in fish farming pools under appropriate fish farming conditions. The subject of the study is the microbiological complex BONAKA-APK-N in growing sturgeon fry. The experimental period is 60 days, the number of fish in a group is 150 pcs. The fish weight in the experimental groups increased by 3.9–14.7 % (P < 0.05) rela-tive to the control. The fish survival rate in all groups was 100 %. When using the microbiological complex BONAKA-APK-N, a decrease in feed costs per 1 kg of live weight gain of fish in all experimental groups was noted compared to the control by 7.0–18.0 % (P < 0.05). The use of the studied feed additive reduces the level of staphylococcus in the intestines of fish in the experimental groups by 3–4 orders of magnitude compared to the control. Biochemical parameters of fish blood serum were within the normal range. The use of the studied feed products allowed to increase the profitability of production by 26.0–69.0 % compared to the control.