The effect of a complex bajillary microbiological preparation on the growth and indicators of the internal environment of the body in juvenile siberian sterlet Acipenser ruthenus marsiglii Brandt

Abstract

Probiotic drugs are a product of agricultural biotechnology. Their use for feeding fish and other aquatic organisms, especially coldwater ones, is currently insufficiently studied. The addition of a bacillary probiotic preparation (based on two species of bacteria of the genus Bacillus in fish feed) was carried out. These microorganisms are symbionts of many warm-blooded animals and are not a specific intestinal microflora of sturgeon. Experimental work was carried out in the UZ of the Aquaculture Research Center of the Novosibirsk State Agrarian University. Studies have shown that the addition of a bacillary probiotic drug in doses of 500 and 1000 mcg per kg of feed when feeding juvenile sterlet weighing 0.27–0.29 kg to a weight of 0.375–0.384 kg for 40 days did not have a positive effect on fish growth in experimental groups. All physiological parameters, such as oxygen consumption, the state of white and red blood, lay within the limits typical for sturgeon fish contained in the ultrasound. At the same time, there is an increase in leukocytosis in fish in the group receiving 1000 mcg/kg of feed within 106,7±16,7–143,8±56,3×103/mcl by an average of 22.3% compared to the control. The oxygen consumption level in the fish in the control group was 18.7–28.31% lower than in the experimental ones. There were no significant changes in the growth rate of fish receiving different doses of the drug. The average daily increase in the group receiving 500 mcg/kg of feed was 4.52 g per day, 1000 mcg/kg — 4.44 g per day. On average, on the 30th day of observations, when compared with the control, the growth rate of juvenile sterlet in the experimental groups was lower by 25.16 and 38.6%. At the same time, the safety of fish in the control group was 96.55, and in the experimental group it was 100%.