Difference of Serum Lipoprotein Profile between Cultured and Wild Red Sea Bream-II

Abstract

As a series of studies to clarify the relationship between serum lipoprotein profile and nutritional physiological metabolism of fat in the fish body, the difference of serum lipoprotein profile between cultured and wild red sea bream Pagrus major was examined by disc electrophoresis and density gradient ultracentrifugation. The low density lipoprotein (LDL) level was higher in cultured red sea bream than in wild red sea bream. In the high density lipoprotein (HDL), though the HDL₃ level was similar between both groups, the HDL₂ level was remarkably lower in cultured fish than in wild fish. Both the levels of thickness coefficient and fat in internals within the limits of macroscopic observation were significantly higher in cultured fish than in wild fish, and the levels of triglyceride and cholesterol contents in serum also exhibited a higher tendency in cultured fish. From these findings, it was suggested that in cultured fish, the nutritional physiological condition of fat in the fish body might be unbalanced toward fat accumulation. Furthermore, although the function of HDL₂ in relation to fat carrier in serum of fish could not be clarified, it was considered that the HDL₂ might be not specially concerned with fat accumulation.