Biofloc-based bacterial community forms an ecological barrier for resisting Vibrio parahaemolyticus infection in shrimp
2026
Jing Wang | Fan Gao | Jiayun Yao | Lei Huang | Xuezhi Fu | Jianfeng Tang | Demin Zhang | Haipeng Guo
Biofloc system (BFS) is a practical method to improve shrimp health via manipulating microbial community. However, the contribution of bacterial communities regulated by BFS in enhancing disease resistance is currently unclear. Here, a cross-combination experiment was conducted using rearing water and shrimp from control and BFS to elucidate the roles of bacterial communities in resisting Vibrio parahaemolyticus infection. The results showed that shrimp cultured in BFS were more resistant to V. parahaemolyticus, and the combinations of shrimp from control (CS) with rearing water from BFS (BW), and shrimp from BFS (BS) with rearing water from control (CW) could all significantly increase the shrimp resistance to V. parahaemolyticus, compared to CW+CS. Following infection, the gut bacterial community in BW+CS and BW+BS groups exhibited less variation in similarity, and higher relative abundances of taxa from Rhodobacteraceae. SourceTracker analysis suggested that shrimp cultured with BW had a reduced contribution of Vibrionaceae from rearing water to the gut. Strains corresponding to four key differential OTUs were isolated from BFS to establish two synthetic communities, which offered a protection to shrimp against V. parahaemolyticus infection. Our study showed that bacterial communities in BFS, especially in rearing water, were important for shrimp to resist pathogen.
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