Westslope Cutthroat Trout

westslope cutthroat trout

The westslope cutthroat trout (Onchorhynchus clarkii lewisii, WCT) was once the most abundant and widely distributed subspecies of cutthroat trout. During the first half of the 20th century, however, the stocking of non-native competing brown trout and interbreeding rainbow trout and Yellowstone cutthroat trout reduced genetically pure WCT populations. The westslope cutthroat trout now occupies less than 5% of its previous range in the upper Missouri River drainage, which includes Yellowstone National Park, where only one population is known within its native range.

Updated 3/19/09