Studies on the phosphorus requirement and proper calcium/phosphorus ratio in the diet of the black sea bream (Sparus macrocephalus) |
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| Authors: | Liu Jingke Li Maotang Wang Keling Wang Xincheng Liu Jianking |
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| Institution: | (1) Institute of Oceanology, Academia Sinica, 266071 Qingdao;(2) Institute of Hydrobiology, Academia Sinica, 430072 Wuhan |
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| Abstract: | An expriment on the phosphorus requirement and the proper Ca/P ratio in the diet of the black sea bream using the phosphorus
gradient method (with casein as basic diet, sodium dihydrogen phosphate as source of phosphorus, and calcium lactate as source
of calcium) showed that growth was greatly affected by the diet's phosphorus content and Ca/P ratio. Inadequate phosphorus
in the diet resulted in slow growth and poor food conversion ratio (FCR). Analyses of the fish body showed it contained a
high level of lipid but a low level of moisture, ash, calcium and phosphorus. The optimal values of phosphorus and Ca/P ratio
in the black sea bream diet are 0.68% and 1∶2 respectively. Phosphorus in excess of this optimum value resulted in slow growth
or even death. The results of this experiment clearly indicated that phosphorus is the principal mineral additive affecting
black sea bream growth.
Contribution No. 1972 from the Institute of Oceanology, Academia Sinica. |
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| Keywords: | phosphorus requirement Ca/P ratio black sea bream |
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