報告書番号

U97080

タイトル（和文）

ヒラメ稚魚期における飼料炭水化物，脂肪の利用能

タイトル（英文）

UTILIZATION OF DIETARY CARBOHYDRATE AND LIPID BY JUVENILE JAPANESE FLOUNDER

概要 （図表や脚注は「報告書全文」に掲載しております）

馬鈴■デンプンを用い，飼料中の炭水化物／タンパク質比がヒラメ稚魚の成長，飼料効率に与える影響について検討した。炭水化物を３３％以上含む飼料区では成長が劣った。また，炭水化物含量の増加に伴って飼料効率が低下したことから，ヒラメでは炭水化物をほんんど利用できないことがわかった。フィードオイルを用い，飼料中の脂肪／タンパク質比がヒラメ稚魚の成長，飼料効率に与える影響について検討した。成長はタンパク質含量６０％以上の飼料区で高く，５５％以下ではタンパク質含量の減少に伴って低下した。脂肪による成長の改善は認められなかった。タンパク質含量５５％以上の飼料では，脂肪含量の増加（１０～１９％）に伴って飼料効率はわずかに上昇した。しかしながら，５０％以下の飼料ではその効果は認められず，さらに２０％以上の脂肪は，ヒラメに対し悪影響を与える可能性が示唆された。

概要 （英文）

THE AVAILABILITY OF CARBOHYDRATE AND LIPID AS AN ENERGY SOURCE IN THE DIET OF JUVENILE JAPANESE FLOUNDERS WAS EXAMINED. 1.CARBOHYDRATES JUVENILE FISH WERE REARED ON DIETS CONTAINING GLUCOSE,MALTOSE,DEXTRIN,AND POTATO STARCH. THE GROWTH AND FEED EFFICIENCY WERE HIGHER IN DIETARY GROUPS WITH DEXTRIN AND POTATO STARCH AND TENDED TO DECREASE WITH DECREASING MOLECULAR WEIGHT OF CARBOHYDRATE. FISH WEREFED DIETS CONTAINING DIFFERENT RATIOS OF FISH MEAL AND POTATO STARCH. NO SIGNIFICANT DIFFERENCE IN GROWTH WAS OBSERVED AMONG GROUPS FEDON 16%,21%,AND 28% CARBOHYDRATE,BUT MORE THAN 33% CARBOHYDRATE CAUSED POORER RESULTS. THE FEED EFFICIENCY DECREASED WITH INCREASING LEVEL OF POTATO STARCH BUT THE PROTEIN EFFICIENCY RATIO WAS IN THE SAME RANGE. 2.LIPID/PROTEIN JUVENILE FISH WERE REARED ON DIETS CONTAINING DIFFERENT RATIOS OF ENERGY AND PROTEIN AT 40%,45%,50%,55%,60%,AND 65% PROTEIN,AND 10% TO28% LIPIDS. THE GROWTH OF FISH WAS HIGHER IN DIETARY GROUPS CONTAINING60% AND 65% PROTEIN,AND DECREASED LINEARLY WITH DECREASING PROTEN IN THE DIET. INCREASING DIETARY ENERGY DID NOT HAVE A POSITIVE EFFECT ON GROWTH AT ANY PROTEIN LEVEL. WHEN THE PROTEIN LEVEL WAS MORE THAN 55%,THEFEED EFFICIENCY IMPROVED SLIGHTLY WITH INCREASING DIETARY LIPID (10% TO 19%) AT THE SAME PROTEIN CONTENT. HOWEVER,AT LESS THAN 50% PROTEIN,THE FEED EFFICIENCY WAS NOT AFFECTED BY LIPID LEVELS OF 16% TO 28%. MORE THAN 20% LIPID CAUSED ADVERSE HEALTH EFFECTS BY INCREASING BLOOD TRIGLYCERIDE LEVELS. THESE RESULTS SHOW THAT JUVENILE JAPANESE FLOUNDERS REQUIRE A HIGH PROTEIN CONTENT IN THE DIET WITH 10% TO 19% LIPID AND A VERYSMALL AMOUNT OF CARBOHYDRATE AS A BINDER.

報告者

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