報告書番号

U97021

タイトル（和文）

養魚飼料原料としてのムラサキイガイの利用

タイトル（英文）

USE OF BLUE MUSSELS AS INGREDIENT IN DIET OFFISH

概要 （図表や脚注は「報告書全文」に掲載しております）

ムラサキイガイ肉乾燥粉末により飼料魚粉タンパク質の１０～６０％を置換した飼料でヒラメ稚魚を飼育したところ，終了時体重および増重率はムラサキイガイを含む飼料区で対象区よりも高くなる傾向が認められた。飼料効率，タンパク質効率は飼料区間でほぼ同じ値となった。ムラサキイガイ肉生鮮を含む飼料でヒラメ稚魚を飼育したところ，飼料成績は北洋魚粉を主体とした対照区と同等以上になった。一方，殻つきムラサキイガイを含む区では，増重率には差がなかったものの，飼料効率やタンパク質効率はわずかに劣った。以上の結果から，ムラサキイガイ肉については，生鮮，乾燥ともヒラメに対し高い栄養性を示し，飼料中に大量に配合できること，また殻つきでも少量であれば飼料原料として使用可能なことがわかった。さらに，ムラサキイガイの添加により，摂■量が増大し，ヒラメの成長が促進されることが示唆された。

概要 （英文）

USE OF BLUE MUSSELS AS AN INGREDIENT IN THE DIET OF JUVENILE JAPANESE FLOUNDER WAS EXAMINED. 1. THE PROXIMATE COMPOSITION AND ESSENTIAL AMINO ACID BALANCE OF BLUE MUSSEL MEAT WERE COMPARABLE TO THOSE OF FISH MEAL. 2. SIX-WEEK (TRIAL 1) AND 8-WEEK (TRIAL 2) FEEDING EXPERIMENTS WERE CONDUCTED AT 20DEGREE WITH FISH OF ABOUT 8-GM AND 5-GM INITAL BODY WEIGHT. BOTH TRIALS WERE CONDUCTED IN TRIPLICATE, AND FISH WERE FED TO SATIATION TWICE-A-DAY, FOR 6 DAYS EACH WEEK. IN TRIAL 1, DIET CONTAINING 74% WHITE FISH MEAL AS THE SOLE PROTEIN SOURCE WAS THE CONTROL, AND 10%, 20%, 40%, AND 60% OF THE FISH MEAL PROTEIN IN THE DIET WAS REPLACED BY BLUE MUSSEL PROTEIN IN THE EXPERIMENTAL GROUPS. THE FINAL BODY WEIGHT FREEZE-DRIED AS WELL AS WEIGHT GAIN TENDED TO BE HIGHER AS BLUE MUSSEL IN THE DIET INCREASED UP TO THE 40% SUBSTITUTION LEVEL, ALTHOUGH THERE WERE NO SIGNIFICANT DIFFERENCES BETWEEN ALL GROUPS. FEED EFFICIENCY AND PROTEIN EFFICIENCY RATIOS WERE IN THE SAME RANGE AMONG ALL DIETARY GROUPS. THERE WERE FEW DIFFERENCES IN HEALTH SUCH AS BODY COMPOSITION AND HEMATOLOGICAL AND HEMATOCHEMICAL PARAMETERS IN ALL GROUPS. IN TRIAL 2, FISH WERE FED DIETS CONTAINING FREEZE-DRIED MEAT, FRESH MEAT, OR WHOLE BLUE MUSSEL. COMPARED TO THE CONTROL (NO BLUE MUSSEL), NO EXPERIMENTAL DIETARY GROUPS SHOWED INFERIOR VALUES IN TERMS OF FINAL BODY WEIGHT AND WEIGHT GAIN. FEED EFFICIENCY AND PROTEIN EFFICIENCY RATIOS WERE SLIGHTY LOW IN DIETARY GROUPS CONTAINING WHOLE BLUE MUSSEL. HOWEVER, FREEZE-DRIED MEAT AND FRESH MEAT DIETS WERE COMPARABLE TO THE CONTROL. AS IN TRIAL 1, THE HEALTH OF THE CULTURED FISH SIMILAR AMONG DIETARY GROUPS. THESE RESULTS SUGGEST THAT BLUE MUSSEL IS AN EFFECTIVE INGREDIENT IN THE DIET OF FLOUNDER, EVEN WHEN USED WHOLE WITH SHELL.

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