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The development of non-antibiotic and environmentally friendly agents is a key consideration for health management in shrimp aquaculture. In this study, the probiotic potential in shrimp aquaculture of  Pediococcus pentosaceus  MR001, isolated from  Macrobrachium rosenbergii , was investigated by means of feeding trial and genetic characterization. In the feeding trial, dietary supplementation with  P. pentosaceus  MR001 significantly increased weight gain and digestive enzyme activity ( p  < 0.05) in shrimp,  Litopenaeus vannamei . The intestinal histology showed that shrimp given the probiotic diet had healthier guts than the control group. Also, the immune gene expression and the survival rate in the treatment group were significantly increased when compared with the control group. The genetic characteristics of  P. pentosaceus  strain MR001 were explored by performing whole-genome sequencing (WGS) using the HiSeq 2500 platform and PacBio system, revealing the complete circular genome of 1,804,896 bp. We also identified 1789 coding genes and subsequently characterized genes related to the biosynthesis of bacteriocins, stress resistance, and bile tolerance. Our findings suggest that insights in the functional and genetic characteristics of  P. pentosaceus  strain MR001 could provide opportunities for applications of such strain in shrimp diet supplementation.

Evaluation of probiotic characteristics and whole genome analysis of Pediococcus pentosaceus MR001 for use as probiotic bacteria in shrimp aquaculture