Efficacy of taurine supplementation for preventing green liver syndrome and improving growth performance in yearling red sea bream Pagrus major fed low-fishmeal diet |
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| Authors: | Shusaku Takagi Hisashi Murata Takanobu Goto Toshiaki Ichiki Makoto Endo Hideo Hatate Terutoyo Yoshida Tadashi Sakai Hirofumi Yamashita Masaharu Ukawa |
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| Institution: | Ehime Prefectural Fisheries Experimental Station, Uwajima, Ehime 798-0104,;Faculty of Agriculture, Miyazaki University, Miyazaki, Miyazaki 889-2192,;Department of Chemistry and Biochemistry, Numazu College of Technology, 3600, Numazu, Shizuoka 410-8501, and;Marubeni Feed Co. Ltd., Uwajima, Ehime 798-0087, Japan |
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| Abstract: | ABSTRACT: This study was performed to evaluate the efficacy of taurine supplementation for preventing green liver syndrome and improving growth performance in red sea bream Pagrus major fed a low-fishmeal (FM) diet. Yearling red sea bream were fed for 34 weeks on low-FM diets either supplemented with taurine, or without taurine, and the tissue taurine and bile pigment concentrations were measured. Compared to the fish fed the FM diet, fish fed the low-FM diet without taurine supplementation resulted in inferior feed performances and higher incidence of green liver related to the morphological transformation of the erythrocytes. In these fish, the hepatopancreatic taurine concentration was significantly lower and hepatopancreatic biliverdin concentration was high compared to the fish fed the FM diet. These parameters were markedly improved by taurine supplementation of the low-FM diet and were similar in levels to the fish fed the FM diet. These results indicate that green liver appearance and inferior feed performances of red sea bream fed the low-FM diet without taurine supplementation were caused by dietary taurine deficiency, and indicate the requirement of taurine supplementation to low-FM diets for red sea bream. |
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| Keywords: | alternative protein bile pigment green liver syndrome low-fishmeal diet red sea bream taurine |
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