Effects of Vibrio harveyi and V.anguillarum on Enzymes Activities in Different Organs of Large Yellow Croaker(Pseudosciaena crocea)

The activities of alkaline phosphatase(AKP),acid phosphatase(ACP),catalase(CAT),superoxide dismutase(SOD),lysozyme(LSZ),and phenoloxidase(PO) were investigated in different organs at 24th hour after the Pseudosciaena crocea was injected with Vibrio harveyi,Vibrio anguillarum and normal saline(control group) respectively.The result showed that,except the activities of ACP from the group injected with Vibrio anguillarum were higher than those in control group,the activities of ACP and ALP in the other groups were not significantly different from the control.Meanwhile,the activities of LSZ in liver were lower than that of the control observably,maybe due to the non-specific immunity was restrained by stress reactions.In conclusion,the activities of LSZ,CAT,SOD and PO changed significantly,in terms of that they could be the indicators of vibrios infection.