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首页> 外文期刊>Journal of great lakes research >Revised fish aging techniques improve fish contaminant trend analyses in the face of changing Great Lakes food webs
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Revised fish aging techniques improve fish contaminant trend analyses in the face of changing Great Lakes food webs

机译：面对不断变化的大湖区食物网，经过修订的鱼老化技术可改善鱼污染物趋势分析

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Incorporation of fish age into the assessment of status and trends for persistent, bioaccumulative and toxic chemicals in the Great Lakes has become an important step for the U.S. EPA's Great Lakes Fish Monitoring and Surveillance Program (GLFMSP). A slowing in the rate of decline for total PCBs in Lake Huron beginning in 2000, led the Program to complete a retrospective analysis to assess how chemical contamination may be influenced by fish age. Analytical results suggest that fish age is an important variable when assessing contaminant trends and that the Program needed to revise its compositing scheme to group fish according to age, rather than by length, prior to homogenization and chemical analysis. An Interlaboratory comparison study of multiple age structures was performed to identify the most appropriate age estimation structure for the Program. The lake trout (Salvelinus namaycush) maxillae was selected, over the otolith, as the most precise, accurate, and rapidly assessed structure for the Program when compared between laboratories and against the known age from the coded wire tag (CWT). Age-normalization practices can now be implemented when assessing contaminant concentrations and trends for the GLFMSP. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
机译：将鱼龄纳入大湖中持久性，生物蓄积性和有毒化学品状况和趋势的评估中，已成为美国EPA的大湖鱼监测和监视计划（GLFMSP）的重要一步。从2000年开始，休伦湖地区多氯联苯的下降速度有所减缓，导致该计划完成了一项回顾性分析，以评估鱼龄对化学污染的影响。分析结果表明，在评估污染物趋势时，鱼龄是一个重要变量，该计划需要修改其合成方案，以便在均质化和化学分析之前根据年龄而不是按长度对鱼进行分组。进行了多个年龄结构的实验室间比较研究，以确定该计划最合适的年龄估计结构。当在实验室之间进行比较时，并根据编码电线标签（CWT）的已知年龄进行比较，湖耳鳟（Salvelinus namaycush）上耳石被选为耳石，是该计划最精确，准确和快速评估的结构。现在可以在评估GLFMSP的污染物浓度和趋势时实施年龄归一化做法。由Elsevier B.V.代表国际大湖研究协会出版。

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