DIOXIN CONCENTRATIONS IN AMERICAN EEL (ANGUILLA ROSTRATA) CAPTURED IN EASTERN CANADA
This research was conducted as part of a project to assess whether chemical contaminants may be responsible for the precipitous decline in American eel (Anguilla rostrata) recruitment to Lake Ontario and eastern Canada. Current concentrations of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and dioxin-like non-ortho polychlorinated biphenyls (dlPCBs), were investigated in whole fish homogenates, due to their persistence and high toxicity. Samples were analyzed by high resolution gas chromatography-mass spectrometry to determine the concentrations of 17 PCDD/F and four dlPCB congeners. Reference eels captured from rivers in eastern Canada that were tributaries to the Gulf of St. Lawrence, ranged from 61 to 80 cm in length, and from 439 to 1260 g in weight. Eels collected from suspected contaminated areas in the St. Lawrence and Lake Ontario ranged from 68 to 127 cm in length, and 518 to 3474 g in weight. Results were expressed as 2,3,7,8- tetrachlorodibenzo-p-dioxin toxic equivalents (TEQs), calculated using fish-specific toxic equivalency factors, and were compared to reported toxicity thresholds for European eel (Anguilla anguilla). Total TEQ values in eels ranged from 0.07-1.6 pg g-1 ww and 0.64-4.0 pg g-1 ww for reference and contaminated sites, respectively. These TEQs were lower than toxicity thresholds established for European eels, suggesting little risk of toxicity.
Byer J D Hodson P V Alaee M Brown R S Backus S Keir M Pacepavicius G Lebeuf M Casselman J Kennedy S
Environment Canada,Burlington,ON,Canada L7R 4A6 Queens University,Kingston,ON,Canada K7L 3N6 Environment Canada,Burlington,ON,Canada L7R 4A6 Queens University,Kingston,ON,Canada K7L 3N6 Fisheries and Oceans Canada,Mont-Joli,QC,Canada G5H 3Z4
国际会议
北京
英文
1-5
2009-08-24（万方平台首次上网日期，不代表论文的发表时间）