Yellowstone National Park Report
Prior to 1900 cutthroat trout (Salmo clarki ) inhabited most drainages of the intermountain west including the Columbia, South Saskatchewan, Missouri, Colorado, Arkansas, Rio Grande, and South Platte Rivers and the Great Basin. Because of overfishing, introductions of nonnative fish, and careless use of water resources, 99% of the original populations of Salmo clarki are believed to have gone extinct (Behnke, 1971). Recently, however, management agencies have become increasingly aware of the precarious situation the cutthroat trout is in and have implemented special regulations to help restore these fisheries.
Loudenslager, Eric J.
"Biochemical and Cytogenetic Analysis of Cutthroat Trout Populations in Northwestern Wyoming,"
University of Wyoming National Park Service Research Center Annual Report: Vol. 2
, Article 26.
Available at: http://repository.uwyo.edu/uwnpsrc_reports/vol2/iss1/26