Effects of arabinoxylan-oligosaccharides (AXOS) on juvenile Siberian sturgeon (Acipenser baerii) performance, immune responses and gastrointestinal microbial community

► Arabioxlan-oligosaccharides are a newly discovered class of candidate prebiotics. ► We assessed the effects of AXOS-32-0.3 or AXOS-3-0.25 in juvenile Acipenser baerii. ► AXOS-32-0.30 improved growth and significantly enhanced innate immune responses. ► AXOS-32-0.30 stimulated the growth of lactic acid bacteria and Clostridium sp. ► The immune effects of AXOS could be related to its fermentation by these bacteria.