Parks Canada has achieved a significant milestone in the restoration of a threatened fish species back to its original habitat in Banff National Park. Following over ten years of dedicated efforts, the federal agency has reported that westslope cutthroat trout are now naturally spawning and repopulating Hidden Lake near Lake Louise.
Aquatics specialist Shelley Humphries, overseeing the Lake Louise, Yoho, and Kootenay field unit for Parks Canada, expressed excitement about the self-sustainability of the trout population. She emphasized the success of the project, citing similar achievements in the United States leading to species delistings.
The restoration initiative faced challenges, with initial attempts to remove invasive brook trout proving unsuccessful. In 2018 and 2019, the use of rotenone, a natural fish poison, effectively eradicated brook trout from Hidden Lake. Subsequent efforts involved stocking the lake with trout eggs annually from 2021 onwards, resulting in successful spawning and the appearance of mature fish this year.
While continuous monitoring is planned, the focus is on observing the trout’s migration to streams and creeks beyond Hidden Lake. Humphries noted the positive population trends and expressed the desire to witness trout spawning in various waterways to support their long-term conservation.
The westslope cutthroat trout, once abundant across Banff National Park and southern Alberta, faced a decline due to recreational fishing and the introduction of non-native species like brook trout. Humphries highlighted the corrective actions being taken to save the fish population, emphasizing the potential for their recovery.
Parks Canada is engaged in similar conservation projects at locations including Helen Lake, Cascade Creek, Katherine Lake, and Corral Creek, with plans underway for the protection of threatened bull trout. Humphries underscored the ecological benefits of preserving native species and the agency’s commitment to safeguarding endangered wildlife.
The ongoing efforts reflect Parks Canada’s dedication to protecting at-risk species and ensuring their survival against past mistakes. The agency’s proactive approach aims to prevent further decline among vulnerable populations and promote biodiversity in the region.