Influence of Lactobacillus Brevis 2K Gv Lactic Acid Bacteria Strain as Part of Biomar Feed on Physiological Condition of Juvenile Parasalmo Mykiss Trout

Abstract

This article is a study of the influence of the Lactobacillus Brevis 2k. Gv Lactic Acid Bacteria (LAB) Strain as Part of the Biomar Feed on the Physiological Condition of Parasalmo Mykiss trout (0+). The supplement to the basic diet was administered by ingestion for 30 days by ingestion at a concentration of 2×10⁸ L. Brevis cells per mg of feed. The result was evaluated against the feed consumption efficiency, hematologic parameters of the bloodstream, and the phagocytic activity. A high LAB content of 29.7% in the intestine of the trout placed on the diet with L. brevis was observed for the entire test period, whereas the average LAB content in the intestine of the reference group fish placed on the additive-free diet did not exceed 2.4%. The occurrence of LAB affected an increase in the ESR and the share of leucocytes actively involved in the phagocytic reactions. The elucidated properties of Lactobacillus brevis: 2k.Gv are the strain features of the species and can be used to develop the probiotic preparation on its basis.