The effect of Lactobacillus. plantarum and Lactobacillus .Brevis isolated from the gastrointestinal tract of fish and its effect on growth and safety indices of common carp (Cyprinus carpio) in comparison with Primalak probiotic

Different groups of lactobacilli have probiotic potential of bacteria that have many positive effects on biological ecosystems in various forms. Also, in intensive fish farming, their use is one of the ways to improve growth, nutrition and survival indices. In the meantime, various researches have been done on probiotics as practical supplements in fish nutrition. Therefore, the need to identify lactobacilli with probiotic potential seems to be very important. Therefore, the aim of this study was to isolate and identify lactobacilli with probiotic potential from the gastrointestinal tract of Capoeta.Razii and its effect on growth and safety indices of common carp Cyprinus carpio. To achieve this, lactobacilli with probiotic potential were isolated and identified from the gastrointestinal tract of Capoeta.Razii by microbial and molecular tests. Of the 3 bacteria identified, 2 were L.Pantarum and one was L. Brevis. 240 pieces of common carp weighing 15 2 2 g were distributed and fed among 12 fiberglass tanks of 500 liters with a storage density of 20 fish in four treatments (3 replications). At the end of the experiment, in the group of fish that received Lactobacillus and Primalak, their growth characteristics such as weight gain, specific growth rate, feed conversion ratio and survival percentage showed a higher and more desirable level than the group of fish whose diet did not contain Lactobacillus and Primalak. (0.05). Also in immune factors, the number of RBC and WBC, total protein, albumin, globulin, C3 increased and the amount of cortisol decreased.