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Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana.

By Northern Rocky Mountain Science Center 2014 (approx.)
Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana.
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Detailed Description

Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana. This region is recognized as a range-wide stronghold for genetically pure westslope cutthroat trout. However, rainbow trout invasion and hybridization threatens these populations. 

Sources/Usage

Image courtesy of Jonny Armstrong.