Effects of dietary Lactobacillus brevis 47f on growth performance, hematological and histological parameters of juvenile sterlet (Acipenser ruthenus)

In this work, a study was conducted on the possibility of using the probiotic strain Lactobacillus brevis 47f in feeds for juvenile sterlet (Acipenser ruthenus). The preservation of lactobacilli in manufactured feeds and the survival rate of the strain on the mucous surface of the intestines of fish were established. In a long-term experiment (60 days), an increase in the number of lymphocytes in the blood was revealed, as well as a change in histomorphometric parameters: the number of lamina propria lymphocytes, the number of goblet cells. There was a significant decrease in the feed coefficient, as well as an increase in sterlet biomass in the experimental group, probably associated with a change in protein metabolism – an increase in the level of total protein, albumin, globulin in blood serum. The conducted studies have shown the possibility of using a number of histomorphometric data to assess the reaction of the gastrointestinal tract in sturgeon fish to feed with a probiotic strain. The results obtained suggest that the probiotic strain L. brevis 47f is promising for use in aquaculture.

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