is a fast growing, easily domesticated, carnivorous fish that is valued for its taste and nutritional value. This specieshas been domesticated and bred successfully in more than a dozen provinces in China, including Heilongjiang, Liaoning, Shandong, and Xinjiang. Despite prior research, the nutrient requirements of are poorly understood. We evaluated the effects of -inositol (MI) levels on body composition, growth performance, and digestive enzyme activity . We formulated seven semipurified basal diets using fish meal, gelatin, and casein as the protein source. The MI content of the diets was 99.8, 199.8, 299.8, 499.8, 799.8, 899.8, or 5 099.8 mg MI/kg diet. Each diet was fed to triplicate groups of 30 fish (mean initial weight: 2.83±0.44 g) for 56 d. The weight gain rate was highest in<0.05) than that in fish fed diets with 299.8 mg MI/kg. Weight gain rate was lowest in the group fed a diet with 99.8 mg MI/kg. Feed conversion ratio was lowest in <0.05) lower than in fed a diet with 299.8 mg MI/kg or 5 099.8 mg MI/kg. The feed conversion ratio was highest in fish fed a diet with 5 099.8 mg MI/kg. The sgrowth rate was significantly higher 499.8–899.8 mg MI/kg than fish fed diets with -inositol did not affect moisture, crude lipid, crude protein, or amylase activity in the liver and lipase activity in fed a diet with 499.8 mg MI/kg had the highest (<0.05) protease activity in the liver, followed those fed by 699.8 mg MI/kg. Lipase activity increased initially and then decreased as the level of dietary MI increased. Lipase activity in the liver of <0.05) higher than in those fed 99.8 mg MI/kg. Protease activity was significantly higher (<0.05) in the intestine of fed diets with 199.8–499.8 mg MI/kg than those fed the other diets. Lipase activity was significantly higher in the intestine of fed 299.8–899.8 mg MI/kg than fish fed 99.8 mg MI/kg. Amylase was significantly higher (<0.05) in the intestine of fed 499.8 mg MI/kg than in the remaining groups. In conclusion, supplementation of diets with moderate concentrations of -inositol resulted in better growth performance and digestive enzyme activity in . Feeding diets with lower MI concentrations was associated with lower weight gain, growth rate, crude lipid levels, and digestive enzyme activity. Feeding diets with excessive MI was associated with reduced growth performance, digestive enzyme activity and feed conversion efficiency. the weight gain rate in was maximized by feeding 536.6 mg MI/kg diet. Our results provide insight into the dietary MI requirements for .