Availabilities of Phosphorus Compounds as Dietary Phosphorus Sources for Red Sea Bream

Abstract

Three experiments were conducted to compare the availabilities of eight phosphorus compounds as a phosphorus sources in the diet for red sea bream, Chrysophrys major. Phosphorus contents of the test diets were adjusted to 680 mg per 100g of diet in each experiment. The fish were reared on the test diets at 25℃ over a 77 day period (Exp. I), 62 day period (Exp. II), and an 88 day period (Exp. III). At the end of the feeding trial, ten fish from each group were selected for the chemical analyses of the blood serum, liver, and vertebrae. Sodium phosphates (mono-, di-, and tribasic), potassium phosphate monobasic, and calcium phosphate monobasic were more effective than calcium phosphates (di- and tribasic) to prevent the development of phosphorus deficiency symptoms. Calcium phytate was scarcely utilized as the dietary phosphorus source by red sea bream. Therefore, the water soluble phosphorus compounds, from which inorganic phosphorus is easily released, should be employed as the dietary phosphorus source for red sea bream