シマアジおよびブリ稚魚の成長に対する飼料中α-およびβ-デン粉の影響〔英文〕

概要

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This experiment was conducted to investigate the availability of dietary gelatinized starch (α-) and raw starch (β-) as an energy source in diet for juvenile striped jack and yellowtail. Both fish were fed three kinds of diets containing either 10% α- or β-starch, and a mixture of both starch at 5% each. The gelatinized ratio (GR) of these diets was 100, 16.6, and 50.0%, respectively. The highest daily feed consumption was observed in fish fed the diet containing 10% β-starch in both experiments. This value was decreased when the content of α-starch in diet increased. The fish fed the diet containing 10% β-starch in both experiments showed the lowest percent gain, feed efficiency, and PER. Crude lipid contents in whole body of fish fed diets containing 10% β-starch alone were lowest among the treatments in both experiments. These results indicated that a supplement of β-starch alone as a dietary carbohydrate source is not effectively utilized for growth of striped jack and yellowtail. On the other hand, good performances were observed in fish fed the diet containing 10% α-starch and a mixture of both starch at 5% each. Thus, these results suggested that the GR of diet for both striped jack and yellowtail should be above 50% in order to achieve better growth performances, at least half of dietary carbohydrate must be α-starch at a supplemental level of 10%.