Parks Canada has achieved a milestone in the preservation of a threatened fish species as westslope cutthroat trout are making a comeback in their traditional habitat within Banff National Park. Following over a decade of dedicated efforts, the federal agency reported that these trout are now starting to spawn naturally and repopulate Hidden Lake near Lake Louise.
Shelley Humphries, an aquatics specialist overseeing Parks Canada’s Lake Louise, Yoho, and Kootenay field unit, expressed her excitement at the self-sustainability of the trout population. She highlighted the successful reintroduction efforts by mentioning that similar projects in the United States have resulted in positive outcomes leading to species recovery.
The initiative to restore the westslope cutthroat trout population began in 2011 with attempts to naturally remove brook trout, which proved ineffective. Subsequently, the use of rotenone, a natural fish poison, in 2018 and 2019 successfully eliminated the invasive species. Starting in 2021, the agency introduced trout eggs into Hidden Lake for four consecutive years, resulting in successful spawning and the appearance of fully grown fish this year.
Humphries emphasized the importance of ongoing monitoring and mentioned the goal of observing the trout using streams and creeks to expand beyond Hidden Lake. She expressed satisfaction with the current population status, with hopes of witnessing the trout spawn in various stream locations, not solely in the headwater lake.
Westslope cutthroat trout were once widespread from the northern to the southern regions of Banff National Park. However, due to factors like recreational fishing and the introduction of non-native fish species such as brook trout in the 1900s, the habitat of westslope cutthroat trout was compromised, leading to their presence in only a fraction of their traditional waterways.
Humphries acknowledged the historical mistakes that endangered the trout population, stressing that corrective actions are both feasible and essential for their survival. She emphasized the agency’s commitment to protecting endangered species like the westslope cutthroat trout, while also mentioning plans to extend similar conservation efforts to threatened bull trout populations.
Parks Canada is actively engaged in conservation projects across various sites, including Helen Lake, Cascade Creek, Katherine Lake, and Corral Creek, with future plans to address the protection of bull trout. Humphries highlighted the broader ecological benefits of preserving native fish species, which support the overall ecosystem by aiding species like birds of prey and bears.
In conclusion, Parks Canada’s primary objective is to safeguard endangered species and prevent their decline, reflecting a commitment to conservation efforts and the protection of biodiversity in Banff National Park.
