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The efficiency of modern aquaculture largely depends on the properties of the feed used. High-quality compound feed should be used by the body to the maximum extent, stimulate its growth and development, and contribute to the environmental safety of the food products produced. To obtain additional gains in body weight, increase the digestibility and assimilability of feed, stimulate nonspecific immunity and save feed costs, immunobiological preparations based on live bacteria are currently introduced into the composition of feed for animals, including fish. One of the most promising immunobiological preparations based on live bacteria is the probiotic "Ferm-KM" containing phyto-microsorbent particles, live bacillus cells and metabolites: strains  Bacillus subtillis, Bacillus licheniformis , complex of lactic acid bacteria and products of their metabolism. The article presents the results of the use of the probiotic "Ferm-KM" in the composition of the production compound feed for sturgeon fish. It was found that when two-year-old Russian sturgeon are grown on a production compound feed with the addition of a probiotic, the fish-breeding and biological parameters of fish increase and the physiological and biochemical parameters of blood improve. The optimal rate of introducing probiotic into the composition of the production compound feed for commercial growing of sturgeon fish is 5 g / kg of compound feed. The effectiveness of introducing a probiotic preparation "Ferm-KM" with an immunomodulatory effect into the composition of compound feed for sturgeon fish has been proved, which helps to increase the linear-weight gain of fish and improve blood parameters. *

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Influence of modern immunobiological preparations based on live bacteria in compound feeds on fish-biological and physiological-biochemical parameters of sturgeon