The effects of selenium on westslope cutthroat trout reproduction and development

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This study examined the effects of Se on the development of Westslope cutthroat trout (Oncorhynchus clarki lewisi). Twelve fish from an exposed site (Clode Pond) and 16 fish from a reference site (O‚ÄôRourke Lake) were captured near a coal mine in British Columbia. Egg Se concentrations ranged from 12.3 to 16.7 and 16.1 to 140.0 µg/g dry weight (dw) in fish collected from the reference site and exposed site, respectively. Previous studies have not shown Se to effect fertilization, however in this study, eggs with Se concentrations >83.3 µg/g dw were not successfully fertilized, while eggs with concentrations >46 and <75.7 µg/g dw were fertilized (96%) but did not produce viable fry. No relationship between Se concentration in eggs and deformities was found. The frequency of deformity in this study, along with the data from other researchers, suggests that thresholds proposed for warm-water fish species are protective for cold-water fish.

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Biological Sciences Department - Simon Fraser University
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Project (M.E.T.)