Westslope Cutthroat Trout Reintroduction Begins

Parks Canada has launched a project to reintroduce westslope cutthroat trout, a species-at-risk, to several lakes within Banff National Park, including Margaret Lake. The initiative began this spring and is being led by the Lake Louise, Yoho, Kootenay field unit.

A Species at Risk

The westslope cutthroat trout was officially listed as threatened under the federal Species at Risk Act in 2013. This designation underscored the critical need for proactive conservation measures to protect the species from further decline.

Ecosystem Restoration is Key

This project extends beyond simply increasing the trout population. It focuses on restoring the overall health and resilience of the mountain ecosystem. Brad Stitt, the project manager, emphasized the trout’s importance as a vital link in the mountain food web.

Historical Decline and Causes

Historically, the westslope cutthroat trout’s range extended from Bow Lake eastward to the Calgary area. However, in the early 1900s, the introduction of non-native brook and rainbow trout for recreational fishing led to competition for resources and a decline in the native trout population.

Reintroduction Strategy

The reintroduction strategy involves removing non-native fish from targeted lakes to create a suitable environment for the westslope cutthroat trout. Between 2022 and 2024, approximately 2,000-3,000 brook trout were removed from Margaret Lake in preparation for the reintroduction.

Reintroduction Methods

Parks Canada is considering two reintroduction methods this spring: transferring adult fish from established populations or establishing a remote incubation site to collect and fertilize eggs, then raising them in a mobile quarantine hatchery.

Long-Term Conservation Goals

François Masse, superintendent of the Lake Louise, Yoho, Kootenay field unit, highlighted the reintroduction efforts as a core component of Parks Canada’s mandate. Daniella Rubeling, acting superintendent of the Banff field unit, noted the project’s significant long-term conservation benefits.

Multi-Species Recovery Plan

A draft 10-year multi-species list, including 53 conservation recovery measures for 23 species, is currently being developed and will be available later this year on the species-at-risk public registry. This demonstrates the agency’s commitment to protecting the park’s ecological integrity.

The reintroduction of the westslope cutthroat trout is a crucial step towards restoring a healthy aquatic system within Banff National Park, contributing to the overall health of the environment.