Efficacy of one‐time rotenone application for Westslope Cutthroat Trout restoration in Boulder Creek, Montana

Impact statement The Westslope Cutthroat Trout is an iconic native species of the northern Rocky Mountains, but hybridization with introduced species, including Rainbow Trout and Yellowstone Cutthroat Trout, has greatly reduced the distribution and abundance of genetically pure populations. This case study reviews an attempt to remove a hybridized population using a single rotenone treatment before restocking with a hatchery‐reared, genetically pure population. These results can aid fisheries managers as they plan and implement fish removal projects.