Optimum dietary taurine level in casein-based diet for juvenile red sea bream Pagrus major |
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| Authors: | Hiroyuki Matsunari Takeshi Yamamoto Shin-Kwon Kim Takanobu Goto Toshio Takeuchi |
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| Institution: | Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Minato, Tokyo 108-8477,;Inland Station, National Research Institute of Aquaculture, Fisheries Research Agency, Tamaki, Mie 519-0423,;National Research Institute of Aquaculture, Fisheries Research Agency, Minami-ise, Mie 516-0193, and;Department of Chemistry and Biochemistry, Numazu College of Technology, Numazu, Shizuoka 410-8501, Japan |
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| Abstract: | ABSTRACT: This study was conducted to investigate the effect of dietary taurine and cholyltaurine (C-tau) on growth and body composition of juvenile red sea bream Pagrus major . Semi-purified casein-based diets supplemented with 0 (control diet), 0.1, 0.3, 0.5 and 0.7% taurine and 0.5% C-tau were fed to red sea bream (average body weight 4.7 g) for 6 weeks at 20°C. The growth and feed efficiency were the lowest in fish fed the control diet. Taurine supplementation improved the growth and feed efficiency of fish dose-dependently, and the taurine requirement was estimated as 0.52% in terms of optimizing growth and 0.48% in terms of optimizing feed efficiency. Taurine content in the whole body and liver increased with the dietary taurine level. Supplemental C-tau at the 0.5% level had limited effects on the growth and no effect on body taurine, biliary bile salt and liver fat contents. From these results it can be inferred that the optimal dietary taurine requirement of juvenile red sea bream is 0.5% on a dry weight basis, and that the supplementation of taurine in the diet not only improves the growth but also increases hepatic lipid levels of red sea bream juveniles. |
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| Keywords: | bile acid casein growth juvenile metabolism Pagrus major taurine |
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