Body lipid deposition in juveniles of red sea bream Pagrus major, yellowtail Seriola quinqueradiata, and Japanese flounder Paralichthys olivaceus

Abstract

The characteristics of lipid deposition in juveniles of red sea bream Pagrus major, yellowtail Seriola quinqueradiata, and Japanese flounder Paralichthys olivaceus, were investigated by feeding diets with three lipid levels (approximately 11, 16 and 20%). In red sea bream, the viscera contributed 40-50% to the whole body lipid store and deposited 35-39% of dietary lipid intake (body lipid gain/lipid intake:lipid deposition ratio), while the carcass contributed 40% and deposited 30-37%. In yellowtail, 50% of the whole body lipid store was found and 25% of dietary lipid intake was deposited in the carcass, while less than 10% was found and about 3% was deposited in the viscera. In Japanese flounder, although 80% of the whole body lipid store was located in the carcass, the lipid deposition ratio of the carcass decreased from 33% down to 19% as the increase of lipid intake, and the viscera represented around 10% of whole body lipid store and deposited 3% of lipid intake. Thus, the juveniles showed different traits of body lipid deposition in their responses to changes in dietary lipid level.