Effects of Dietary Protein and Lipid Levels on Growth, Feed Utilization and Body Composition of Adult Starry Flounder (Platichthys stellatus)
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Abstract
A 25-week feeding trial of two dietary protein (47 and 52%) and three dietary lipid level (7, 12 and 17%) factorial design with three replications were conducted to determine effects of dietary protein and lipid levels on growth, feed utilization and body composition of adult starry flounder (Platichthys stellatus), average initial weight 332 g, during the winter season. Survival of fish was not affected by either dietary protein or dietary lipid level. Weight gain, feed efficiency and protein efficiency ratio improved with dietary protein and lipid levels except for those of fish fed the 52% protein diet with 17% lipid. The best growth and feed utilization were observed in the 52% protein diet with 12% lipid, but were not significantly different from those of fish fed the 52% protein diet with 17% lipid or the 47% protein diets with 17% lipid levels. Hepatosomatic and visceralsomatic indexes were significantly influenced by dietary protein level, but not by dietary lipid level. None of moisture, crude protein, crude lipid, or glycogen contents of dorsal muscle or liver in starry flounder except for crude lipid in dorsal muscle was significantly influenced by either dietary protein or dietary lipid level. Plasma cholesterol concentration was significantly influenced by both dietary protein and dietary lipid levels. The results of this study suggest that the diets containing 47% protein with 17% lipid or 52% protein with 12-17% lipid are optimal for growth and feed utilization of adult starry flounder under these experimental conditions.
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