Abstract
Analysis of commercial fish taken in 1980 mostly from one area of Lake Ontario was undertaken to obtain information on the levels and incidence of the contaminant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Sixty-two (62) samples of fish comprising 10 different species were analyzed by using a validated extraction, cleanup, and detection procedure. Seven of the 10 species contained measurable levels of the isomer, 2,3,7,8-TCDD, between 2 and 39 parts per trillion (ppt) with five samples above 20 ppt. Channel catfish, American eel, and rainbow smelt had the highest values, and the lowest levels were found in rock bass, black crappie, and pumpkinseed. The presence of high levels of PCB (> 1 ppm) and a high lipid content (> 3 %) indicated a high probability of dioxin contamination. Comparison of this data with those generated by other laboratories from all the Great Lakes indicated that the larger species of commercial fish such as channel catfish and carp particularly from Lake Ontario and part of Lake Huron have the highest levels and incidence of 2,3,7,8-TCDD.
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