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首页> 外文期刊>Environmental toxicology and chemistry >Dioxin-Like Contaminants are No Longer a Risk to the American Eel (Anguilla rostrata) in Lake Ontario
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Dioxin-Like Contaminants are No Longer a Risk to the American Eel (Anguilla rostrata) in Lake Ontario

机译：像二恶英一样的污染物不再对安大略湖的美洲鳗（Anguilla rostrata）构成威胁

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The embryotoxicity of extracts of American eels (Anguilla rostrata) was measured to determine whether maternally derived contaminants contribute to the declining recruitment of eels to Lake Ontario. Sexually maturing, large yellow and silver eels were sampled in 2007 and 2008 from 5 locations in eastern Canada, including Lake Ontario; positive controls included eels from the Hudson River, United States, and Canal Dessel-Schoten, Belgium (European eel, Anguilla anguilla). Japanese medaka eggs were injected immediately after fertilization with 1 or 10 nL of eel extract and, after 12 d, scored for signs of toxicity. Eel extracts did not cause dioxin-like embryotoxicity, reflecting the low concentrations of total dioxin equivalents measured chemically in these same extracts. Embryo mortality and reduced hatching success at high doses of eel extracts may reflect the bioaccumulation of legacy or emerging chemicals of concern. The results were consistent with long-term trends of declining concentrations of persistent organic pollutants (POPs) in tissues of eels and other fish species from Lake Ontario, trends of declining embryotoxicity of eel tissue extracts, and recent increases of recruitment of juvenile eels to Lake Ontario. If dioxin-like compounds contributed in the past to the decline of recruitment and abundance of American eels in Lake Ontario, these data suggest that recruitment should recover, following the same trends as the recovery of lake trout reproduction in Lake Ontario. (C) 2017 SETAC
机译：测量了美洲鳗鱼（Anguilla rostrata）提取物的胚胎毒性，以确定母体来源的污染物是否有助于减少鳗鱼向安大略湖的募集。性成熟的大黄鳗和银鳗分别于2007年和2008年从加拿大东部的5个地点取样，包括安大略湖；阳性对照包括来自美国哈德逊河和比利时的运河Dessel-Schoten的鳗鱼（欧洲鳗鱼，安圭拉安圭拉）。受精后立即将1或10 nL鳗鱼提取物注射到日本鸡蛋中，并在12天后对其毒性迹象进行评分。鳗鱼提取物没有引起二恶英样的胚胎毒性，反映出在这些相同的提取物中化学法测得的总二恶英当量浓度低。高剂量鳗鱼提取物的胚胎死亡率和成功孵化率降低可能反映了所关注的旧有或新兴化学品的生物蓄积性。该结果与来自安大略湖的鳗鱼和其他鱼类的组织中持久性有机污染物（POPs）浓度下降的长期趋势，鳗鱼组织提取物的胚胎毒性下降趋势以及最近向湖中补充幼鳗的增加趋势一致。安大略省。如果过去二恶英样化合物导致安大略湖美洲鳗的补充和数量减少，则这些数据表明，应按照与安大略湖鳟鱼繁殖的恢复趋势相同的趋势恢复补充。 （C）2017年SETAC

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