コイとクロダイによる魚粉中燐の利用〔英文〕

概要

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The utilization of phosphorus in white fish meal by two kinds of fish was studied by rearing the fishes on diets with no phosphorus supplement, low phosphorus supplement (105mg per 100g diet), and high phosghorus supplement (705mg per 100g diet). Carp, Cyprinus carpio, fed the low phosphorus diet were extremely inferior to the high phosphorus diet group in the growth and feed efficiency, whereas in black sea bream, Mylio macrocephalus, little difference was found between the low and high phosphorus diet groups. Phosphorus contents in blood serum and vertebrae were also lowest in carp fed the low phosphorus diet. Carp could scarcely absorb the phosphorus in white fish meal, but the percent absorption of the phosphorus by black sea bream was approximately 30%. From these findings, it can be concluded that the poor absorption of phosphorus in fish meal by carp is probably attributable to the absence of acidic gastric juice, and this same absence is the main cause for the growth retardation and decreased feed efficiency resulting from the low supplemental phosphorus diet.