Parks Canada is celebrating the successful return of a threatened fish species to its native habitat in Banff National Park. Following over ten years of dedicated efforts, the federal agency has announced that westslope cutthroat trout are starting to spawn naturally and reestablish themselves in Hidden Lake, situated near Lake Louise.
Shelley Humphries, an aquatics specialist overseeing Parks Canada’s Lake Louise, Yoho, and Kootenay field unit, expressed satisfaction that the trout population is now self-sustaining. She highlighted the remarkable progress, emphasizing the assurance that the fish will thrive in the area. Humphries drew parallels with successful initiatives in the United States, where similar conservation work has led to the removal of endangered statuses.
Humphries recounted the process that began in 2011 to eliminate brook trout naturally, which proved unsuccessful. Subsequently, in 2018 and 2019, the agency resorted to using rotenone, a natural fish poison, to eradicate brook trout. Starting in 2021, Parks Canada introduced trout eggs into Hidden Lake for four consecutive years, resulting in successful spawning and the emergence of fully grown fish this year.
Continued monitoring is planned, with the expectation that the fish will expand their habitat beyond Hidden Lake by utilizing streams and creeks. Humphries expressed optimism about the current population status, stressing the importance of observing spawning activities in various waterways to ensure long-term sustainability.
The initiative to reintroduce westslope cutthroat trout aims to rectify past mistakes that led to the decline of the species due to factors like recreational fishing and the introduction of non-native fish species. Humphries acknowledged the historical challenges faced by the fish and emphasized the correctability of the situation, asserting that the species is on the brink of rescue.
In addition to the efforts at Hidden Lake, Parks Canada is engaged in similar conservation projects at various sites, including Helen Lake, Cascade Creek, Katherine Lake, and Corral Creek. Future plans involve implementing similar measures to protect threatened bull trout. Humphries highlighted the ecological benefits of these initiatives, emphasizing their positive impact on other wildlife species like birds of prey and bears compared to the presence of brook trout.
A primary objective for Parks Canada is to safeguard endangered species like the westslope cutthroat trout and ensure their survival through proactive conservation measures.