中文摘要：

将牙鲆置于浓度为0．5mg／L的Pb溶液中18d，测定其鳃、肌肉、全部内脏中谷胱甘肽过氧化氢酶（GSH-PX）的活性。结果表明，最初8d，各组织的GSH-PX的酶活性表现为抑制，随后各组织GSH-PX的酶活性表现为诱导；10d时，诱导幅度最大，而后表现为抑制。紧接着放入清洁海水，各组织的酶活性又恢复到对照组的水平。结果提示，对于低浓度铅的长期暴露，GSH-PX能明显指示牙鲆受海洋铅的早期污染。

英文摘要：

The effect of long term exposure to Pb （0.5mg/L） on activities of protecting enzyme GSH-PX in tissues （gill, muscle and visceral organs） of Paralichthys olivaceus was studied. It was shown that the activities of protecting enzyme GSH-PX in all tissues of P. olivaceus was inhibited on the 8th day, and was induced on the following days; on the 10th day, enzyme activity induction was at the highest level, and was inhibited again thereafter. Then after a few days＇ cultivation in clean water, activity of protecting enzyme GSH-PX in all tissues was reduced to the initial level. These results also suggested that GSH-PX could be used as a bio-indicator of low concentration Pb^2＋ exposure in aquatic organisms.