Studies on the Subacute Toxic Effects of Copper, Cadmium, Dichlorvos and Methamidophos on Penaeus vannamei

Subacute toxic effects of copper, cadmium, dichlorvos and methamidophos on Penaeus vannamei shrimp were investigated. The shrimp had been cultured in 6 groups containing different concentrations of four compounds for 60d to determine the subacute toxic effects of poison on shrimp. The growing speed in the experimental groups is lower than the control group(except for the low Cu concentration group), and the higher the concentration is, the lower the speed is. Influences of copper, cadmium, dichlorvos and methamidophos on the activity of cholinesterase(ChE)were also studied. The result showed that dichlorvos and methamidophos caused more significant change in ChE activity than copper and cadmium.