摘要：

The effects of various dietary lipid and pantethine levels on body composition of channel catfish were investigated using a 2 x 3 factorial design. Purified casein/gelatin diets containing two levels of lipid (5 and 10%) and three levels of pantethine (0, 250, and 1000 mg/kg) were fed to fingerling channel catfish initially weighing 3.3 g in 38-1 flow-through aquaria for 12 weeks to evaluate the effects of the experimental diets on growth rate and feed efficiency. Following the feeding trial, fish were analyzed for proximate composition of whole-body, liver and fillet samples as well as hepatosomatic index and intraperitoneal fat (IPF). Fatty acid analysis was also performed on fillet lipids. Factorial analysis of variance indicated that dietary lipid had significant (P < 0.05) effects on growth, feed efficiency and body composition. The diets containing 10% lipid generally produced higher weight gain and feed efficiency values as well as higher IPF, whole-body and fillet lipid levels. In the liver, 10% dietary lipid significantly increased only the ash level. Fatty acid analysis of fillet samples revealed that both dietary lipid and pantethine had significant effects on composition. The 5% lipid diets generally produced increased levels of palmitic, stearic and oleic acids and the 10% lipid diets produced increases in myristic, linoleic, erucic and docosapentaenoic acids. Supplementation of pantethine had no effects on weight gain and feed efficiency but produced increased levels of oleic acid in fillet lipids. Based on results from this study, dietary lipid significantly influenced performance and lipid deposition of channel catfish, whereas effects of pantethine (at 250 and 1000 mg/kg diet) were negligible.

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