Environmental Resources Management Canada, 1111 West Hastings St., Vancouver, BC V6E 2J3, Canada; Aquatic Contaminants Research Division, Environment Canada, Water Science & Technology Directorate, 867 Lakeshore Rd, Burlington, ON L7R 4A6, Canada.
Aquatic Contaminants Research Division, Environment Canada, Water Science & Technology Directorate, 867 Lakeshore Rd, Burlington, ON L7R 4A6, Canada.
Sci Total Environ. 2020 Dec 1;746:136525. doi: 10.1016/j.scitotenv.2020.136525. Epub 2020 Jan 7.
We explored tissue concentrations of polychlorinated biphenyls (PCBs), chlorinated pesticides, and relevant organochlorines and fish health in the following adult wild fish in the St. Clair River Area of Concern (Ontario, Canada): shorthead redhorse (Moxostoma macrolepidotum), yellow perch (Perca flavescens), and emerald shiner (Notropis atherinoides). We collected adult fish from sites within the river's industrial zone (Stag Island), a downstream site adjacent to Walpole Island (Chenal Écarte), and an upstream reference site in Lake Huron in 2002/2003 and 2014. We tested for trends in tissue concentrations of organic contaminants across sites and over time; we assessed the potential effects of contaminants on morphological indicators of fish health across sites by year. Over the 12-year period, the tissue concentrations of most PCBs declined at the river sites, except for some non-legacy PCBs (PCB11 and 185), which increased in yellow perch at Stag Island, a new observation for fish in the St. Clair River AOC. There was little difference between the concentrations of calculated toxic equivalents (TEQs) of the Lake Huron and the St. Clair River fish in 2014, except for emerald shiners from Stag Island which had elevated ΣPCB and TEQs. Each fish species at all sites exceeded the Canadian tissue residue guideline for PCBs for the protection of mammalian wildlife consumers of aquatic biota, but fish-derived TEQs indicated little potential health risk to fish. Over time, hexachlorobutadiene and hexachlorobenzene concentrations increased in some fish at Stag Island by about 8- and 4-fold, respectively, whereas they decreased at other sampling locations. Principal Component Analysis followed by Linear Discriminant Analysis of the 2014 SHRH data suggested that although the fish separated by site, tissue concentrations of PCB and organochlorine contaminants did not have consistent relationships to the morphological health indicators, including egg production in females, which implied the absence of causative relationships.
我们研究了圣克莱尔河关注区（加拿大安大略省）以下野生成鱼的组织中多氯联苯（PCBs）、氯代杀虫剂和相关有机氯化合物的浓度以及鱼类健康状况：短吻拟鲿（Moxostoma macrolepidotum）、黄鲈（Perca flavescens）和翡翠拟鲿（Notropis atherinoides）。我们于 2002/2003 年和 2014 年在河流工业区（ stag 岛）、下游与沃尔波尔岛（Chenal Écarte）相邻的地点以及休伦湖的上游参考点采集了成年鱼类。我们测试了不同地点和不同时间有机污染物浓度的变化趋势；我们根据每年的情况评估了污染物对鱼类健康形态指标的潜在影响。在 12 年期间，除 stag 岛黄鲈中的一些非传统 PCBs（PCB11 和 185）外，河流地点的大多数 PCB 组织浓度下降，这是圣克莱尔河关注区鱼类的一个新观察结果。2014 年，休伦湖和圣克莱尔河鱼类的计算毒性等效物（TEQs）浓度差异不大，除了 stag 岛的翡翠拟鲿，其ΣPCB 和 TEQs 含量较高。所有地点的每个鱼类物种都超过了加拿大组织残留量指南，以保护水生生物群哺乳动物野生动物消费者免受 PCBs 的影响，但鱼类衍生的 TEQs 表明对鱼类的潜在健康风险很小。随着时间的推移，六氯丁二烯和六氯苯在 stag 岛的一些鱼类中的浓度分别增加了约 8 倍和 4 倍，而在其他采样地点则减少了。2014 年 SHRH 数据的主成分分析和线性判别分析表明，尽管鱼类根据地点进行了分离，但 PCB 和有机氯污染物的组织浓度与形态健康指标（包括雌性产卵）之间没有一致的关系，这意味着不存在因果关系。
