The paper presents the data of veterinary-sanitary assessment of the Lena sturgeon grown using the nutrient feed additive Akwa-Biot-Norm. It has been revealed that organoleptic characteristics of fish samples correspond to the benign products. The chemical composition of the muscle tissue of the experimental and control groups of fish was almost the same. The cadmium level in both fish groups was 0.007 mg/kg; the mercury level was 0.00019 mg/kg and 0.00018 mg/kg in the control and in the experimental group respectively, which does not exceed the maximum permissible concentrations. Microbiological studies of Lena sturgeon meat have shown that the number of mesophilic aerobic and facultative anaerobic microorganisms (NMAFAnM) in fish samples does not exceed the safety requirements and nutritional value of food products. Coliform bacteria (BGKP), Staphylococcus, Salmonella, and Listeria monocytogenes were not isolated from all selected samples (control and experimental). The results of the veterinary-sanitary assessment of the Lena sturgeon grown with the use of the nutrient feed additive Akwa-Biot-Norm indicate that the fish meets the requirements of the technical regulations of the Eurasian Economic Union “On the safety of fish and fish products” (EEU TR 040/2016) and is safe for the consumer.

Growing fish in industrial conditions is accompanied by the pressure of various environmental factors on it. Any changes in the environment affect the physiological state and general resistance of the fish, resulting in reduced growth rates, resistance to adverse factors of different nature, and increased mortality. In such conditions, the issue of finding the means and methods of enhancing the protective functions of objects of breeding and cultivation is particularly relevant. Currently, the drugs that have pronounced biological activity are used to improve the functional state of the fish, as well as to increase the value of the artificial feed. In the conditions of the fish farm of LLC YUTAS of the Chuvash Republic, extensive production studies were conducted to assess the effectiveness of the use of nutrient feed additive Akwa-Biot-Norm to the Lena sturgeon, developed by scientists of the Chuvash State Agricultural Academy. Research results indicate that the use of nutrient feed additives in the technology of growing Lena sturgeon (Acipenser baeri, Brandt) has a positive effect on some fish-breeding indicators, such as growth rates and survival rates for fish, etc. Thus, the use of biogenic feed additives contributed to a significant increase in the overall weight gain of fish by 5.06% and safety by 2.6% for the period of the experiment (240 days). The results of hematological and immunological studies show a general improvement in the physiological state of the growing objects. The use of biogenic feed supplements had a positive effect on the number of erythrocytes and leukocytes, hemoglobin content, the ratio of lymphocytes and neutrophils and the concentration of total protein in blood serum. In fish, there was an increase in the level of hemoglobin in the blood, as well as an increase in the total protein content in the blood serum by 10.9% to the control indicator, which is a favorable prerequisite for optimizing metabolic processes and guaranteeing high nonspecific resistance. The application of nutrient feed additives has improved the resistance of fish to diseases associated with stress, such as saprolegnia. The conducted studies confirm the efficiency of application of nutrient feed additives Akwa-Biot-Norm for growth stimulation and disease prevention of fish due to the activation of nonspecific resistance of the organism in terms of the pressing environmental and technological stress factors.