MFO activity and contaminant analysis of overwintering juvenile chinook salmon in the Fraser River
Conference
·
OSTI ID:392315
- Univ. of Victoria, British Columbia (Canada)
- Dept. of Fisheries and Oceans, Sidney, British Columbia (Canada). Inst. of Ocean Sciences
- Dept. of Fisheries and Oceans, Cultus Lake, British Columbia (Canada). Cultus Lake Lab.
Various organic contaminants, including some PAHs, PCBs and chlorinated dibenzo-p-dioxins and furans, induce liver cytochrome P450 1A1 (CYP 1A1) and its associated enzyme activity (ethoxyresorufin-O-deethylase; EROD). In this study, analysis of carcasses for dibenzo-p-dioxins, dibenzofurans and PCBs were compared to liver MFO activity. Juvenile chinook salmon (Oncorhynchus tshawytscha) were sampled in March, 1994 at a reference site on the Nechako River free from the influence of industrial activity and at sites near Prince George, Stoner, Longbar and Soda Creek on the Fraser River, and on the Thompson River. Fish from the Nechako site had the lowest MFO activities, accompanied by the lowest whole body dioxin and furan concentrations. Fish from Longbar, Soda Creek and the Thompson River had the highest MFO activities. Fish from Prince George contained the highest dioxin concentrations, but furans and mono-ortho substituted PCBs were highest at the Soda Creek and Thompson sites. MFO activity correlated most strongly with PCB concentrations. The results of this study suggest that liver MFO activity in O. tshawytscha could be employed as one biological index of environmental quality in the Fraser River.
- OSTI ID:
- 392315
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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