After 30 days of exposure, the body weight and total length of shrimps exposed to copper at 0.90 mg/1 and higher was significantly lower (P< 0.05) than those in the control. The 30-day EC50 (concentration that reduced weight gain by 50% of that of the controls) and 60-day EC50 were 2.82 and 1.89 mg/1 copper, respectively