飼料タンパク質含量がマハタの飼育成績，蓄積率および筋肉カテプシン活性に及ぼす影響

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タイトル別名
  • Effect of Diet Protein Levels on Growth Performance, Nutrient Retention and Muscle Cathepsin Activities of Grouper, Epinephelus septemfasciatus.
  • シリョウ タンパクシツ ガンリョウ ガ マハタ ノ シイク セイセキ チクセキ

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Grouper, Epinephelus septemfasciatus, having a mean body weight of 1, 200g were fed for 71 days on diets with 38, 44, 49 and 54% levels of protein, respectively. The diets were prepared from 80% brown fishmeal and 20% wheat gluten. The daily feeding rate was about the same among the four diet groups. The highest weight gain, feed efficiency and apparent fat retention were obtained in the 49% protein group, while the highest protein efficiency ratio and apparent protein retention were detected in the 44% protein group. Besides that hepatosomatic index and final liver fat content of both 38 and 44% protein groups were lower than those of 49 and 54% protein groups, final proximate compositions of the whole body and liver showed no meaningful differences among the dietary treatments. Comparing the 40% and the 49% protein group, aspartate aminotransferase and alanine aminotransferase activities in liver and cathepsin D and B+L activities in white muscle of the latter were slightly higher than those of the former, but the liver RNA/DNA ratio of the former was higher than the latter. These results indicate that diet protein levels affect on growth performance as well as amino acid and protein metabolisms of grouper. A desirable diet protein level for grouper is 44-49% for the growth performance, and about 44% for amino acid and protein metabolisms.

収録刊行物

  • 水産増殖

    水産増殖 46 (4), 529-534, 1998

    日本水産増殖学会

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