摘要:
为控制虫害农业上大量使用硫丹,因此硫丹可通过多种途径进入水环境中。养殖环境和水产品中已发现硫丹残留,这给养殖环境和食品安全造成潜在威胁。通过半静态试验方法测定了罗非鱼和草鱼的半致死浓度,并估算了其在水环境中的安全浓度。结果表明,罗非鱼和草鱼的半致死浓度分别为1.97(1.26-2.87)μg·L-1和2.33(1.66-3.32)μg·L-1,安全浓度分别为0.20和0.23μg·L-1。为进一步验证这2种鱼对硫丹的抗性,将罗非鱼和草鱼在最低剂量组(0.7μg·L-1)中暴露60d,发现这2种鱼个体状态良好。因此,初步证明这两种鱼在水中的安全浓度比目前国家规定的标准值要高。但是关于硫丹对这2种鱼的内分泌干扰、生殖和生长等方面的影响还需作进一步的研究。
关键词:
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急性毒性
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硫丹
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罗非鱼
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草鱼
Abstract:
Endosulfan has been discovered in aquaculture environment and aquatic products,which was massively used in agriculture.It was a potential hazard to environment quality and food safety.The acute toxicity of endosulfan to tilapia(Oreochromis aureus O.niloticus) and grass carp(Ctenopharyngodon idellus) were measured using a semi-static bioassay.The 96 h LC50 values were 1.97(1.26-2.87) μg·L-1 and 2.33(1.66-3.32) μg·L-1 for Oreochromis aureus×O.niloticus and Ctenopharyngodon idellus,respectively.Correspondingly,the safe concentrations of endosulfan for the two fish were 0.20 and 0.23μg·L-1.Furthermore,the fish exposed to 0.7 μg·L-1 dose for 60 days were always in good physical condition.Therefore,the level of endosulfan in water which the two fish can be tolerant,was higher than the level reported in water environment in China.
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