Isolation, identification and biological characteristics of lactobacillus from grass carp

As the problem of aquaculture diseases is growing, the harm of using antibiotics and drugs is more and more serious so the research on ecological control technology is an important way to achieve healthy aquaculture. In this study, eight lactobacillus strains were isolated from the intestinal tract of healthy grass carps (Ctenopharyngodon idella). The identification result indicates that all the eight strains were Lactobacillus plantarum. The results of biological characteristics evaluation show that L. plantarum strain Y190430 had a high growth rate, and it was sensitive to common antibiotics. In addition, compared with the standard strain and commercial lactobacillus, L. plantarum Y190430 represented better tolerance to environmental stress such as acid, alkali, salt and temperature. Besides, it had a higher acid production rate and inhibited the growth of pathogenic bacterias better. The results provide references for the research on ecological control of aquatic diseases.