Growth and antioxidant
ability of prawns with low nitrite were higher than those of prawns with high nitrite. Prawns fed with Cu of
30 and 60 mg/kg diet had significantly higher weigh gain, specific growth rate and antioxidant enzymes
(T-AOC, Cu-Zn SOD and GPx) activities than those prawns fed diets with copper deficiency and excess
regardless of nitrite level (P < 0.05)