Range
In the past, this subspecies was found throughout portions of the Colorado River drainage in Wyoming, Colorado, Utah, Arizona, and New Mexico. However, today scientists believe this fish occupies 13% of its historic range (Range-Wide Status of Colorado River Cutthroat Trout (Oncorhynchus clarkii pleuriticus): 2005).
Colorado River cutthroats are thought to have occupied the basin of upper Muddy Creek, a tributary of the Little Snake River (which ultimately flows into the Colorado River) in southern Carbon County, Wyoming. Historical accounts in letters and diaries refer to them as "mountain trout" or "speckled trout." The fish may have begun to disappear from the upper Muddy Creek in the 1850s as a result of physical changes made to the environment by travelers, the introduction of the brook trout and other non-native species, and possibly the over-trapping of beavers, which affected dams and dependent habitats.
Read more about this topic: Colorado River Cutthroat Trout
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