Macronutrient Composition Of Formulated Diets For Yellow Catfish (Pelteobagrus Fulvidraco Richardson) Juvenile

1280 Yellow catfish juvenile (Pelteobagrus fulvidraco Richardson) were randomly divided into 64 groups, and randomly distributed to 64-littil-cage in one pond. 21 diet were designed in this test, and 1-20 diet had three replicate a diet, but 21 diet (center point) had four replicate This feeding test lasted for 60 days.Dietary protein, lipid and carbohydrate level varying scope, respectively, were 30-48%, 3-18% and 26-35%. The aim of this study was to determine optimal macronutrient composition of formulated diets for Yellow catfish (5.7±0.5g) juvenile.These results clearly showed, (1) at dietary protein 39-42%, with corresponding to dietary lipid 6-12% and carbohydrate 26-29%, and with digestible energy 15.63 -16.95 MJ/kg and the ratio digestible energy to protein 36.38-43.46MJ/kg, Yellow catfish juvenile, SGR was higher. (2) The protein, lipid and carbohydrate in muscle and liver were affected by dietary protein, lipid and carbohydrate level (P<0.05), and at carbohydrate 35%, the carbohydrate inclusion in muscle and liver both were the highest. (3) HSI and FMB increased significantly with increasing dietary lipid level (P<0.05), however not significantly by dietary protein and carbohydrate (P>0.05). In addition, the carbohydrate content in muscle and liver were affected by dietary carbohydrate level (P<0.05). (4) The lipid content in muscle, HSI, FMB and viscera increased with increasing dietary digestible energy level, however FMB more apparent (P<0.05).In conclusion, Yellow catfish juvenile, optimal dietary protein, lipid, carbohydrate, digestible energy level and the ratio digestible energy to protein, respectively, were 39-42%, 9-12%, 26-29%, 15.63 -16.95 MJ/kg and 36.38-43.46MJ/kg.