Abstract
The article presents the results of a study of the biological properties of the Lactobacillus brevis 2k.Gv strain (morphological, cultural, biochemical, physiological and probiotic) in order to assess the biotechnological potential and create alternative forms of probiotics for highly productive fish farming. Under the conditions of an aquarium experiment, a positive effect of the strain on the physiological parameters of the rainbow trout Parasalmo mykiss Walbaum was found. L. brevis 2k. Gv was orally administered to fish for 30 days at a concentration of 2×108 cells/mg feed as a supplement to the main diet. It was found that the studied strain has a multifactorial effect on the fish organism. Throughout the entire period of feeding juvenile trout with extruded feed enriched with lactobacilli, no signs of infectious and somatic diseases were recorded in the experimental group of trout; hepatosomatic and splenosomatic indices of organs, as well as hematological parameters of blood remained normal. The results obtained prove the presence of probiotic properties in the Lactobacillus brevis 2k. Gv strain and the possibility of its further use as part of feed additives for therapeutic and prophylactic purposes for aquaculture objects.
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