ISOLATION OF STRAINS ANTAGONISTIC TO PATHOGENIC AEROMONADS FROM NATURAL POPULATIONS OF FISH AND BOTTOM SEDIMENTS

Abstract

Increasing production efficiency and ensuring the environmental safety of commercial fish farming facilities through the creation of modern preparations for the treatment and prevention of diseases is a topical area of aquaculture. The study of the current situation shows that the factors limiting the possibilities of sustainable entry to the market, providing fish farms with high-quality highly productive breeding material and increasing the volume of commercial fish farming products are diseases of the breeding facilities. The development of new highly effective probiotic preparations for the prevention and treatment of aquaculture facilities will not only reduce the economic costs associated with the death of breeded fish, but will also help to increase the viability of fish, the accumulation of nutrients in tissues, and the correction of the microbiocenosis of the aquatic environment. The aim of the study is to search for natural Bacillus antagonistic strains promising for creating probiotics. The strains were isolated from bottom sediments and cyprinids of natural populations. In the course of the work, the antimicrobial spectrum of action of bacilli against the causative agents of aeromonosis, furunculosis and bacterial hemorrhagic septicemia (BHS) was studied. Aeromonas test-strains were isolated from sterlet, sturgeon, stellate sturgeon, trout, carp, grass carp, silver carp, grown in conditions of pond farms.