A Principal Source of Deposited Lipid in Phosphorus Deficient Red Sea Bream

Abstract

To clarify a principal source of deposited lipid in phosphorus deficient red sea bream, Chrysophrys major, the effect of dietary phosphorus level on the absorption of dietary lipid and the effects of dietary carbohydrate and lipid levels on lipid content of the carcass were examined.
The absorption of dietary lipid showed a similarly high value in all groups without regard to dietary phosphorus level. Phosphrous deficient fish on diets with and without carbohydrates, stored lipid abundantly, but those on diets lacking lipid did not. Furthermore, fatty acid composition of deposited lipid in the adipose tissue was similar to that of dietary lipid.
From these findings, it was presumed that dietary lipid was not well utilized as energy source and gradually accumulated in phosphrous deficient fish.