Effect of Dietary Starch Level and Kind on the Growth and Body Composition of Juvenile Olive Flounder Paralichthys olivaceus
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A 7-week feeding trial was conducted to investigate the effect of dietary starch level and kind on the growth and body composition of juvenile olive flounder. Triplicate groups of fish (average weight: 1.5 g) were fed iso-nitrogenous (48% crude protein) and isocaloric (4.8 kcal/g diet) diets containing 15-25% α-potato starch and 15% β-potato starch. Survival was not affected by dietary starch level and kind. The weight gain of fish fed the diet containing 20% α-potato starch was significantly higher than that of fish fed the diets containing 15% and 25% α-potato starch levels. The feed efficiency and protein efficiency ratios of fish fed the diets containing 15% β-potato starch were significantly lower than those of the other groups (P < 0.05). The protein efficiency ratio tended to increase with increasing α-potato starch. The daily feed intake of fish fed the diet containing 15% β-potato starch was significantly higher than that of the other groups (P < 0.05). The hepatosomatic index, condition factor, and proximate composition of the whole body were not affected by the dietary starch level and kind. These results indicate that up to 20% α-potato starch could be incorporated into the juvenile flounder diet for optimum growth.
Abstract
A 7-week feeding trial was conducted to investigate the effect of dietary starch level and kind on the growth and body composition of juvenile olive flounder. Triplicate groups of fish (average weight: 1.5 g) were fed iso-nitrogenous (48% crude protein) and isocaloric (4.8 kcal/g diet) diets containing 15-25% α-potato starch and 15% β-potato starch. Survival was not affected by dietary starch level and kind. The weight gain of fish fed the diet containing 20% α-potato starch was significantly higher than that of fish fed the diets containing 15% and 25% α-potato starch levels. The feed efficiency and protein efficiency ratios of fish fed the diets containing 15% β-potato starch were significantly lower than those of the other groups (P < 0.05). The protein efficiency ratio tended to increase with increasing α-potato starch. The daily feed intake of fish fed the diet containing 15% β-potato starch was significantly higher than that of the other groups (P < 0.05). The hepatosomatic index, condition factor, and proximate composition of the whole body were not affected by the dietary starch level and kind. These results indicate that up to 20% α-potato starch could be incorporated into the juvenile flounder diet for optimum growth.
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