Physiological Studies on Cultured Red Sea Bream-IV

Separate groups of red sea bream, Chrysophrys major, were kept in cold water of an ambient temperature of 7.7-12.9°C and in warm water controlled at 18.0-19.5°C. After 5 and 11 weeks, the incidence of green liver was checked, and some of the chemical components and enzymatic activities of the plasma were analyzed. The incidence of green liver in the fish maintained at the elevated temperature was much less than that in the fish maintained in the natural cold environment. The cold water fish showed higher levels of triglyceride and higher glutamate-oxalacetate transaminase and lactate dehydrogenase activities even though results varied widely among individuals within a group. Alkaline phosphatase and inorganic phosphate levels were higher in the warm water fish. The levels of total cholesterol, glucose, calcium, and magnesium were approximately the same for both groups.