三丁基锡对罗非鱼稚鱼生长和ATP酶活力的影响

在实验生态条件下,研究浓度为0.1、1、10 ng/L的三丁基锡对罗非鱼稚鱼生长、死亡率及Ca2 -ATP酶和Na ,K -ATP酶活力的影响.结果显示:三丁基锡抑制罗非鱼稚鱼的生长发育.其中15 d的1 ng/L和10 ng/L暴露组体长较对照组显著性降低;15 d和30 d的10 ng/L暴露组死亡率较对照组均显著增加.三丁基锡对罗非鱼稚鱼的Ca2 -ATP酶和Na ,K -ATP酶活力的抑制均表现剂量依赖性.Ca2 -ATP酶和Na ,K -ATP酶活力的变化与死亡率具有一定相关性.

Effect of Tributyltin Exposure on Growth and Activities of ATPase in Juvenile Tilapia nilotica

To determine whether early life exposure to tributyltin(TBT) impaired postnatal development in fish,the fries of Tilapia nilotica were exposed to environmentally realistic levels(0.1 ng/L,1 ng/L,10 ng/L) of TBT for 15 days or 30 days respectively.The effects on growth and mortalities and Ca~(2 )-ATPase,Na~ /K~ -ATPase activities were evaluated.The results show that the growth of Tilapia nilotica exposed to TBT was inhibited.The total length of Tilapia nilotica exposed to the 1 ng/L or 10ng/L TBT for 15 or 30 days respectively decreased significantly compared to the control.The mortalities of Tilapia nilotica exposed to the 10 ng/L TBT for 15 days or 30 days respectively increased significantly compared to the control.The activities of Ca~(2 )-ATPase and Na~ ,K~ -ATPase in all groups were inhibited by TBT in a concentration-related manner compared to the control,the activity of Ca~(2 )-ATPase exposed to the 10ng/L TBT for 15 or 30 days respectively decreased significantly compared to the control.A significant reduction of Na~ ,K~ -ATPase was found when exposed 10 ng/L TBT for 30 days.There is a relationship between Ca~(2 )-ATPase,Na~ /K~ -ATPase activitives and the morality.