Effects of ammonia exposure on superoxide dismutase actives and malondialdehyde contents in liver of juvenile paralichthys olivaceus

Juvenile ofparalichthys olivaceus under short time exposure to different ammonia concentrations were used to study the effects of ammonis on the activety of superoxide dismutase(SOD) and content of malondialdehyde(MDA) in liver of the fish.The results indicated that SOD activeties were activated to significant level at higher concentrations or with the delay of exposure time under the condition of this experiment,as compared with control,but no changes were observed in MD contents in liver with ammonia exposure.