Parks Canada has launched a significant reintroduction program for the at-risk Westslope Cutthroat Trout in Banff National Park this spring. This initiative highlights the broader importance of conservation efforts in preserving biodiversity and restoring ecological balance in vulnerable mountain ecosystems. Staff from the Lake Louise, Yoho, and Kootenay field unit are stocking Margaret Lake and other protected headwater sites with genetically pure native trout, following the successful removal of invasive species.
Historically widespread across Alberta’s eastern slopes, the Westslope Cutthroat Trout (Oncorhynchus clarkii lewisi) has declined dramatically to less than 10 percent of its original range due to hybridization with introduced brook and rainbow trout, habitat alteration, and emerging threats such as whirling disease. Listed as threatened under Canada’s Species at Risk Act since 2013, this subspecies serves as an important indicator of aquatic ecosystem health in cold, high-elevation waters.
Preparatory efforts included the targeted removal of thousands of non-native brook trout from Margaret Lake using rotenone between 2022 and 2024, building on prior successes at sites like Hidden Lake. Banff National Park, Canada’s first national park, continues to attract tourists from around the world who enjoy its pristine lakes and hiking trails, offering visitors a personal connection to these conservation landscapes.
This project is expected to strengthen native fish populations and enhance overall ecosystem resilience against climate pressures, serving as a valuable model for similar restoration initiatives worldwide.
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