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Studies on the green liver in cultured red sea bream fed low level and non-fish meal diets: Relationship between hepatic taurine and biliverdin levels

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The aim of this study was to investigate the cause of green liver in red sea bream fed substitute protein diets. Red sea bream Pagrus major was given either of the following diets for 28 weeks: (1) control diet (50% fish meal), (2) low level fish meal diet (15% fish meal), and (3) non-fish meal diet (0% fish meal). The green liver was observed in all groups tested, but the incidence was much higher in the experimental diet groups. The feeding of substitute protein diets reduced plasma triglyceride and cholesterol levels. However, there was no significant difference in plasma hepatic enzyme activities and plasma bile salts concentration among the treatments. Fish fed the substitute protein diets showed low hepatic taurine levels with an appearance of a biliverdin in the liver. Moreover, the proportion of ditaurobilirubin to total biliary bile pigments was significantly lower in fish fed the substitute protein diets. These data indicate that feeding of substitute protein diets did not induce any cholestatic hepatobiliary obstructions and that the low hepatic taurine level was one of the probable factors responsible for the occurrence of green liver in red sea bream fed substitute protein diets.
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Keywords: Pagrus major; bile pigments; green liver; red sea bream; substitute protein diets; taurine

Document Type: Research Article

Affiliations: 1: Ehime Prefectural Fisheries Experimental Station, Uwajima, Ehime 798-0104, 2: Faculty of Agriculture, Miyazaki University, Miyazaki, Miyazaki 889-2192, and 3: Ono Research and Laboratory, Technical Service Department, Marubeni Feed Co. Ltd, Ono, Hyogo 675-1355, Japan

Publication date: 2001-02-01

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