報告書番号

U91013

タイトル（和文）

ヒラメの高密度飼育技術の開発

タイトル（英文）

DEVELOPMENT OF HIGH-DENSITY REARING TECHNOLOGY FOR INTENSIVE PRODUCTION OF JAPANESE FLOUNDER,PARALICHTHYS OLIVACEUS

概要 （図表や脚注は「報告書全文」に掲載しております）

種苗から商品サイズまで，一貫してヒラメを高密度飼育する技術を開発するための検討を行った。水量４．５ｍ３の循環濾過養魚水槽を用いて，ヒラメを体重約３０ｇの種苗から約１年間，一般養殖施設の２～４倍に当たる密度で飼育した。実験終了時の生残率は約９０％であり，ヒラメの体重は４００～５００ｇ／尾に達し，水質管理を十分行えば，循環濾過水槽による，養殖を目的とした長期のヒラメ高密度飼育が可能なことが確認された。また，ヒラメの成長にともなう酸素消費量，アンモニア排泄量などの変化について明らかにし，飼育水中に供給する酸素量，アンモニア浄化のために必要な濾材量などを算定するための原単位とした。

概要 （英文）

LONG-TERM REARING EXPERIMENTS WERE CARRIED-OUT,TO DEVELOP A CLOSED RECIRCULATING FISH CULTURE SYSTEM FOR INTENSIVE PRODUCTION OF JAPANESE FLOUNDER. SOME PHYSIOLOGICAL-ECOLOGICAL CHANGES OF JAPANESE FLOUNDER WITH GROWTH WERE STUDIED TO DRAW-UP A REARING MANUAL. THE RESULTS ARE SUMMARIZED AS FOLLOWS: 1.FISH REACH A COMMERCIAL SIZE OF 400 500 G(INITIAL: CA. 30 G) AFTER 11 12 MONTHS REARING IN A 4.5 CUBE CM CLOSED RECIRCULATING FISH CULTURE SYSTEM. THE RESULTS CONFIRM THAT REARING AT 2 TO 4 TIMES HIGHER DENSITIES THAN THAT OF CURRENT FLOUNDER CULTURE FARMS IN JAPAN IS POSSIBLE WITH A RECIRCULATING FISH CULTURE SYSTEM WHEN THE WATER QUALITY AND FEEDING ARE HELD AT THE OPTIMUM LEVELS. 2.SHORT- AND LONG-TERM REARING EXPERIMENTS SHOW THAT THE UPPER-LIMIT REARING DENSITY FOR EACH DEVELOPMENTAL STAGE OF THE FLOUNDER IS AS FOLLOWS:JUVENILE, 1200; YOUNG, 200;IMMATURE, 100 FISH/SQUARE M. 3.IN REARING EXPERIMENTS FROM 10DEGREE TO 30 DEGREE,THE MAXIMUM GROWTH RATE OF YOUNG AND IMMATURE FLOUNDERS WAS AT 25 DEGREE. 4.SOME PHYSIOLOGICAL-ECOLOGICAL CHANGES OF JAPANESE FLOUNDER,SUCH THE RATES OF OXYGEN CONSUMPTION,AND AMMONIA-N EXCRETION,WITH GROWTH WERE CLARIFIED AND EXPRESSED AS EQUATIONS RELATED TO BODY WEIGHT. THE RATES WERE USED TO DESIGN CULTUREAND REARING MANAGEMENT SYSTEMS.

報告者

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