“…Meanwhile, a significant decrease in mucosal fold height, perimeter ratio, and microvilli length and density was observed in DI of fish fed the SBM diet. It is supposed that dietary high‐SBM inclusion caused the damage of intestine morphology structure, decrease in digestion enzyme activities (Liu et al, ) and nutrient absorption (Buttle et al, ; Olli, Hjelmeland, & Krogdahl, ; Refstie, Storebakken, & Rorm, ; Storebakken et al, ) and eventually the poor growth performance. The supplementation of tributyrin at 0.1% and 0.2% levels in SBM‐based diets significantly improved fish growth performance, resulting in comparable values to that of fish fed the FM diet (Table ), which is consistent with findings in poultry (Antongiovanni, Buccioni, Minieri, Galigani, & Rapaccini, ; Antongiovanni et al, ) and pigs (Dong et al, ; Hou, Liu, Hu, & Shen, ).…”