報告書番号

U00004

タイトル（和文）

魚粉を削減したヒラメ用飼料の開発

タイトル（英文）

Development of practical diet for aquaculture of Japanese flounder

概要 （図表や脚注は「報告書全文」に掲載しております）

魚粉を単独のタンパク質(CP)源とする飼料を対照区とし、魚粉CPの半分程度を脱脂大豆(SBM)、血粉およびムラサキイガイ(BMM)などで置換した飼料により体重4gのヒラメを8週間飼育した。コーングルテンミール(CGM)についても同様に検討した。SBM単独で魚粉CPの約45%を置換した場合、飼料効率は対照区に比べ有意に劣った。SBMの一部を血粉で置換した飼料の飼料成績は対照区と同等であったが、CGMでは効果がなかった。さらに、SBM飼料に5%のBMMを添加したところ、成長、飼料効率とも対照区に比べ有意に高くなった。魚粉CPの55%を置換した場合、何れの組み合わせも飼料成績の低下を招いた。CGM単独で魚粉CPの40%を置換した場合、飼料効率、成長とも劣る傾向にあった。CGM飼料では、血粉の添加により成長、飼料効率がさらに低下した。成長への悪影響はCGMによる置換が高まるにつれ強くなった。

概要 （英文）

Feeding experiments were conducted to examine the potential use of defatted soybean meal (SBM) in combinations with blood meal (BM), corn gluten meal (CGM) and freeze dried meat of blue mussel (BMM) as a partial replacement of fish meal (FM) in the diet of Japanese flounder. Availability of CGM in combinations with BM and/or BMM was also examined. Juvenile fish of about 4 g in initial body weight were fed diets to satiation twice daily, 6 days per week for 8 weeks at 20℃ in both feeding experiments. Weight gain of fish fed diet replacing 45% FM protein with SBM was not different from that of fish fed the control diet containing FM as a protein source, however, feed efficiency (FE) in fish fed the SBM diet was significantly lower. Growth and feed performance of fish fed diet replacing 45% FM protein with SBM and BM were comparable to those of fish the control diet. Inclusion of 5% BMM for equal amount of SBM in the SBM-BM diet improved the growth and FE of the flounder remarkably and both values were significantly higher than those in the control. Replacing 55% of FM protein with SBM and CGM or SBM and BM resulted in poor growth performance. There were not marked differences in hematological characteristics together with proximate composition of the whole body of cultured fish fed the dietary treatments. Weight gain and FE of fish fed diet replacing 40% FM protein with CGM were inferior to those of fish fed the control diet containing FM as a protein source. Replacement of 40% FM protein with CGM and BM made those parameters worse. Inclusion of BMM in CGM-BM diet did not improve the growth of fish. Adverse effects of replacing FM protein with CGM and/or CGM and BM were stronger with increasing replacement level.These results indicate that SBM is highly available as alternative protein source for fish meal in the diet of Japanese flounder. SBM in combination with BM successfully replace about 45% of FM protein in the diet without supplemental amino acids. Furthermore, it is suggested that more replacement can be attained with inclusion of 5% BMM in the SBM diet. CGM is not considered to be useful ingredient on practical bases.

報告者

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