The requirement for dietary calcium (Ca) of giant croaker Nibea japonica was investigated by feeding them with purified diets containing different levels of Ca for 10 weeks at temperatures of 23.0-25.5℃. The rearing water used contained 400mg Ca/l. Dietary Ca levels were found to affect greatly the growth and feed utilization. Ca contents of vertebrae were independent of dietary ea supplements. The results indicated that a minimum Ca level of 0.10% of the dry diet was required to maintain the normal growth and feed utilization of juvenile giant croaker.
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