ブリ幼魚用飼料における魚油精製副産物の利用

Transcription

1 Journal of Fisheries Technology, 7(2), 69-74, 2015 水産技術,7(2), 69-74, 2015 ブリ幼魚用飼料における魚油精製副産物の利用 古板博文 *1 杉田毅 *2 山本剛史 *3 風直樹 *4 *4 山本浩志 Evaluation of nutritional value of a fish oil by-product in a diet for fingerling yellowtail Seriola quinqueradiata Hirofumi FURUITA, Tsuyoshi SUGITA, Takeshi YAMAMOTO, Naoki KAZE and Hiroshi YAMAMOTO A 50-day feeding experiment was conducted to evaluate the nutritional value of a fish oil by-product rich in phospholipids, obtained from tuna and bonito processing residue, in low-fish-oil diet (LFO) for yellowtail. Control diet contained fish oil as the sole lipid source (HFO). Fish oil content of HFO was reduced to one-third and substituted by soybean oil to prepare LFO. Fish oil content of LFO diet was replaced with fish oil by-product and squid liver oil to prepare fish oil by-product diet (FOB). As fish oil byproduct contained less n-3 highly unsaturated fatty acids (HUFA) than fish oil, squid liver oil was added to satisfy the n-3 HUFA requirement. After the feeding experiment, final body weight, weight gain and specific growth rate of fish fed FOB were comparable to those for fish fed HFO, and higher than for those fed LFO. Feed efficiency showed a similar trend to fish growth. n-3 HUFA levels in liver of fish fed HFO were significantly higher than for those fed LFO and FOB, and were similar between fish fed LFO and FOB. These results suggest that the inclusion of fish oil by-product in a low-fish-oil diet improves growth and feed performance in yellowtail fingerlings. キーワード 産,n-3HUFA,, 産, 産, (Tacon et al. 2008,Turchini et al. 2009) 産 (Tacon et al. 2008), Seriola quinqueradiata 産,, (Watanabe 2002), 産 (EFA) n-3 (n-3hufa) 産 (Tocher 2003),, 50% (Watanabe 2002),n-3HUFA, n-3hufa, ( 水産 Nansei Laboratory, National Research Institute of Aquaculture, FRA, Nakatsuhamaura, Minami-ise, Watarai, Mie , Japan furuita@affrc.go.jp 水産 水産 水産 69

2 Sargent et al n 3HUFA 20 30% EFA Salhi et al EFA Watanabe % 67% 材料と方法 46% 3 2 2/3 n 3HUFA n 3HUFA 2% Takeuchi 1997 n 3HUFA n 3HUFA n 3HUFA 試験魚 g 200L C L/ 試験飼料 KW 1 77% 22% 16% n 3HUFA 14% 20% n 3HUFA 表 1. % % 16: : : : :4n :5n :5n :6n n 3 HUFA* 13.7 *n 3 HUFA=20:4n 3+20:5n 3+22:5n 3+22:6n 3 表 2. % n 3HUFA g/kg : NaCl, 40; MgSO 4 7H 2 O, 600; Fe citrate, 100; Ca lactate, 140; ZnSO 4 7H 2 O, 1.41; MnSO 4 4H 2 O, 0.65; CuSO 4 5H 2 O, 0.13; CoCl 2 6H 2 O, 0.004; KIO 3, 0.012;, g/kg :, 0.86;, 0.70;, 0.83;, 2.50,, 2.71;, 30.00;, 0.03;, 0.15;, 0.001;, 10.8;, 0.3;, ;, 6;,

3 48 80 C = 100/ / = In In 100/ g/kg / = g 1000/ + /2 + /2 / = + 100/ = +100/ 分析方法 C C 5 Folch et al Juanda and Rocquelin 1985 MK 6 GC 2010Furuita et al 結果飼料の分析値 % n 3HUFA % n 3HUFA 2% Takeuchi 1997 表 3. % 14: : :1n : :1n :1n :2n :3n : :4n :5n : :5n :6n n n n 3 HUFA n 6/n :4n 6/20:5n :6n 3/20:5n 飼育結果 4 魚体の分析結果 5 18:2n n 3HUFA 表 % g % %/ g/kg / %

4 表 5. % n 3HUFA DHA 22:6n 3 20:4n 6 EPA 20:5n 3 考察 50% Watanabe % 67% EFA n 3HUFA 2% Takeuchi 1997 n 3HUFA n 3HUFA 15 20% Takeuchi 1997 n 3HUFA 10% 3 n 3HUFA EFA Torstensen and Tocher 2011 Salmo salar Torstensen 表 6. % : : :1n : :1n :1n :2n :3n : :4n :5n : :5n :6n n n n 3 HUFA

5 表 7. % : : :1n : :1n :1n :2n :3n : :4n :5n : :5n :6n n n n 3 HUFA* and Tocher 2011 n 3HUFA n 3HUFA 67% EFA n 3HUFA n 3HUFA n 3HUFA n 3HUFA 3 DHA EPA DHA EPA Sargent et al DHA/ EPA /EPA DHA EPA EFA Pagrus major EPA DHA EFA 2009 n 3HUFA Scophthalmus maximus Sparus aurata Bell and Sargent 2003 /EPA Bell and Sargent

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