Red sea bream, Chrysophrys major, fed diets containing different levels of phosphorus for 76 days were analyzed to determine the chemical composition of the entire body, dorsal muscle, liver, and vertebrae. It was found that the decrease of the dietary phosphorus level resulted in the increase in the lipid contents of the muscle, liver, and vertebrae and in the decrease in the glycogen content of the liver and in the crude ash, calcium, and phosphorus content of the vertebrae. Little difference, however, was noted in the Ca/P ratio in the vertebrae among the various experimental groups.