This study was conducted to investigate the feed attractant properties of recombinant Bacillus subtilis CM65-P att ′ (secreting P att , a functional peptide screened after enzymatic hydrolysis of the cotton meal) on the appetite regulatory system, growth performance, intestinal structure integrity, and digestive and absorptive functions of blunt snout bream ( Megalobrama amblycephala ). A total of 240 blunt snout breams were s...