三氯异氰尿酸对剑尾鱼(Xiphophorus helleri)毒性及其抗氧化酶影响

TOXICITY AND ITS EFFECTS UPON THE ANTIOXIDANT ENZYMES OF TRICHLOROISOCYANURIC ACID TO SWORDTAIL FISH XIPHOPHORUS HELLERI

采用生物毒性测试与评价方法对常用消毒剂药物三氯异氰尿酸(Trichloroisocyanuric acid,TCCA)对剑尾鱼的急性毒性及其Ⅰ、Ⅱ相代谢酶活性影响进行了研究。结果表明,TCCA对剑尾鱼的96h LC50为2.15mg/L。TCCA对剑尾鱼肝脏还原型谷光苷肽(GSH)、谷胱苷肽硫转酶(GST)和7-乙氧基异吩恶唑酮-脱乙基酶(EROD)都存在诱导作用。雌雄个体在GST和EROD的诱导响应时间有显著差异性,其中雄性个体GST对TCCA暴露响应比雌性个体敏感。

The toxicity and effect of TCCA （trichloroisocyanuric acid） upon swordtail fish Xiphophorus helleri were studied in acute toxicity tests with the values of biomarkers in Phase Ⅰ and Phase Ⅱ. The biomarkers included activities of EROD （7-ethoxyresorufin-O-deethylase）, GST （glutathione S-transferase） and total GSH （glutathione）. Results showed that TCCA was highly noxious to the swordtail fish during early exposure period. The 96h LC50 of TCCA was 2.15mg/L. Induction effects were observed for GSH, EROD and GST in liver tissues of swordtail fish under the exposure of TCCA. Among them, GST and EROD were more sensitive to the exposure of TCCA and may be used as alternative biomarkers of TCCA exposure. However, some differences were noticed between female and male individuals for GST and EROD in response time to TCCA exposure; male fish were more sensitive to TCCA. In term of EROD, female individuals showed persistent induction during the whole exposure period, while male ones did so only in the early and middle period of the exposure and decrease afterwards.