I surveyed existing publications, reports, historical documents, and selected agency files, conducted field surveys, and interviewed reliable observers knowledgeable about selected waters to determine the native and present distribution of westslope cutthroat trout (Oncorhynchus clarki lewisi) in Canada. I evaluated this information in the light of existing knowledge of potential threats to arrive at provisional determinations of risk status. In British Columbia, westslope cutthroats once occupied: the mainstem of the upper Kootenay River and its major tributaries below impassable barriers; certain Columbia River headwaters; and some small, disjunct headwaters, mostly above barrier falls in the lower Kootenay, Columbia, and South Thompson drainages. Most of the apparently genetically pure native stocks still extant in several upper Kootenay tributaries are vulnerable to hybridization with, or replacement by, accessible nonnative salmonids now widespread in that drainage...
Mayhood, David W.. 1999. Provisional Evaluation of the Status of Westslope Cutthroat Trout in Canada (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks; University College of the Cariboo. Conference Biology & ManagementProceedings
Topic: Species and Ecosystems at Risk
Keywords: Alberta, Columbia River, Kootenay River, Oncorhynchus clarki lewisi, westslope cutthroat trout