Abstract
Fingerling Nile tilapia were fed purified diets with and without supplemental zinc ranging from 0 to 100 mg Zn/kg diet for 70 days. Nile tilapia fed the basal diet containing 1 mg Zn/kg developed deficiency signs such as anorexia and poor growth. Fish fed the lowest levels of supplemental zinc (0 and 5 mg Zn/kg diet) had poor growth and high mortality, while the levels over 30 mg/kg showed reduced mortality and markedly improved growth. Dietary zinc levels were significantly correlated with whole-body zinc concentration. A strong negative correlation also observed between dietary zinc and whole-body iron. Weight gain percent, feed efficiency, serum zinc and bone zinc concentrations indicated that the minimum zinc requirement of fingerling Nile tilapia is 30 mg Zn/kg dry diet.
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