報告書番号

U93025

タイトル（和文）

ヒラメの成育促進技術の開発１．飼料のタンパク質含量と成長

タイトル（英文）

DEVELOPMENT OF TECHNOLOGIES TO HASTEN GROWTHOF JAPANESE FLOUNDER 1.EFFECTS DIETARY PROTEIN LEVEL ON GROWTH

概要 （図表や脚注は「報告書全文」に掲載しております）

乳性ガゼインをタンパク質源とする飼料（タンパク質含量：２４～６７％）で，初期体重３ｇの稚魚を飼育した。また，北洋魚粉を主体とした魚粉飼料（同：２１～６０％）で，初期体重９ｇの稚魚，５０ｇの若魚および３００～４００ｇの未成魚を飼育するとともに，飼料組成が栄養代謝に与える影響を調べるため，飼育後の未成魚について，筋肉および肝臓成分の分析を行った。（１）増重率および飼料効率は，いずれの成長段階においても，飼料タンパク質含量の増加に伴って上昇する傾向を示した。一方，タンパク質効率は，稚魚および若魚では，飼料タンパク質含量によらずほぼ一定となったものの，未成魚では，タンパク質含量の増加に伴って上昇した。（２）未成魚筋肉中の水分，灰分，タンパク質および脂肪含量は，飼料タンパク質含量に関係なく一定であった。また，肝臓中のグリコーゲン含量は，タンパク質含量の低い飼料区ほど高くなった。以上の結果から，肉食性

概要 （英文）

THE PROTEIN-SPARING ACTION OF OTHER ENERGY SOURCES IN THE DIET HAS BEEN STUDIED IN A NUMBER OF FISH SPECIES SUCH ASRAINBOW TROUT AND EEL,AND OPTIMUM PROTEIN TO ENERGY RATIOS HAVE BEEN DETERMINED.HOWEVER,THERE ARE FEW DATA ABOUT THE NUTRITIONAL REQUIREMENTSOF JAPANESE FLOUNDER.WE CONDUCTED REARING EXPERIMENTS WITH DIETS CONTAINING DIFFERENT LEVELS OF CASEIN AND DEXTRIN,AND WHITE-FISH MEAL AND WHEAT FLOUR TO EXAMINE THE EFFECT OF DIETARY PROTEIN LEVEL ON GROWTH AND BODY COMPOSITION OF THE JAPANESE FLOUNDER.(1)WEIGHT GAIN AND FEED EFFICIENCY OF JUVENILE FLOUNDER FED ON THE CASEIN DIET INCREASED WITH INCREASING DIETARY PROTEIN LEVEL,AND DAILY FEED CONSUMPTION TENDED TO DECREASE.HOWEVER,THE PROTEIN EFFIV CIENCY RATIO WAS NOT AFFECTED BY DIETARY PROTEIN LEVEL. SIMILAR TRENDS WERE SHOWN IN REARING EXPERIMENTS ON JUVENILE,YOUNG AND IMMATURE FLOUNDER WITH THE FISH MEAL DIET,BUT THE PROTEIN EFFICIENCY RATIO OF IMMATURE FLOUNDER INCREASED WITH INCREASED DIETARY PROTEIN LEVELS. (2)THE DIETARY PROTEIN LEVEL DID NOT AFFECT THE PROXIMATE COMPOSITION AND AMINO ACID COMPOSITION OF THE MUSCLE OF IMMATURE FLOUNDER FED ON THE FISH-MEAL DIET FOR 8 WEEKS.LIVER CRUDE PROTEIN AND CRUDE LIPID CONTENT DECREASED WITH INCREASED DIETARY CARBOHYDRATE LEVEL,GLYCOGEN CONTENT INCREASED.BASED ON THESE EXPERIMENTS,IT IS BELEVED THAT JAPANESE FLOUNDER CAN NOT UTILIZE DIETARY CARBOHYDRATE AS AN ENERGY SOURCE AT ANY DEVELOPMENTAL STAGE,SO CARBOHYDRATE PROTEIN-SPARING IN THE DIET IS NOT EFFECTIVE.

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