Parks Canada has reported positive developments in the restoration of a threatened fish species to its original environment in Banff National Park. Following more than ten years of efforts, westslope cutthroat trout are now beginning to naturally spawn and repopulate Hidden Lake near Lake Louise, as confirmed by Shelley Humphries, an aquatics specialist within Parks Canada’s Lake Louise, Yoho, and Kootenay field unit. Humphries expressed satisfaction in the self-sustainability of the trout population, noting the success of similar initiatives in the United States that have led to the removal of species from the endangered list.
The restoration project initially attempted to naturally eliminate brook trout in 2011 without success. However, in 2018 and 2019, the use of rotenone, a natural fish toxin, effectively removed brook trout from the area. Subsequent efforts involved introducing trout eggs into Hidden Lake annually from 2021, resulting in successful spawning and the emergence of fully mature fish this year. While ongoing monitoring is planned, the ultimate goal is for the trout to expand their habitat beyond Hidden Lake by utilizing streams and creeks.
Humphries emphasized the overall healthy population of the westslope cutthroat trout, expressing a desire to witness their spawning in streams as well, in addition to their presence in the headwater lake. The species was historically widespread in Banff National Park and southern Alberta but faced decline due to recreational fishing and the introduction of non-native species like brook trout, which encroached on their habitat, leaving them restricted to only 10% of their traditional waterways.
Parks Canada aims to rectify past mistakes by safeguarding the imperiled fish species. Similar conservation efforts are ongoing in various locations, including Helen Lake, Cascade Creek, Katherine Lake, and Corral Creek. Future plans include extending similar initiatives to protect threatened bull trout. Humphries highlighted the ecological benefits of preserving the westslope cutthroat trout, not only for the species itself but also for the broader ecosystem, benefiting other wildlife such as birds of prey and bears.
The commitment of Parks Canada to the conservation of endangered species remains resolute, as Humphries emphasized the agency’s determination to fight for the preservation of at-risk species. The project showcases a dedication to protecting biodiversity and restoring balance to the ecosystem, aligning with the agency’s overarching goal of nurturing and safeguarding vulnerable species.