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At the same time, non-motorized watercraft from outside park boundaries will not be allowed into Waterton Lakes ºÃÉ«tv Park in southern Alberta starting April 1, to protect against both whirling disease and invasive zebra and quagga mussels.

Jeanette Goulet, with the aquatic invasive species program for mountain national parks, said Tuesday that boats are the main way species are transferred between bodies of water.

"They can pick up things like mud, sand and sediments, plant fragments," she said.

"And if their equipment is not cleaned of all of that, drained of any standing water, and dried for a certain amount of time, then that poses a big risk of transferring aquatic organisms … between water bodies."

British Columbia's first case of whirling disease was detected in Emerald Lake last year and was later found in Kicking Horse River, Wapta Lake, Finn Creek, Monarch Creek and the confluence of Emerald River and the Kicking Horse River.

Access was first restricted for five months last October, and François Masse, Parks Canada's superintendent for Lake Louise, Yoho and Kootenay, said extending the restrictions another year will help protect fish species including several types of trout and Kokanee.

Goulet said staff will be monitoring the parks and anyone found breaking the rules could face a fine of up to $25,000.

There's no treatment specifically for whirling disease, Goulet said, and removing the diseased fish from the water system is not feasible.

She said officials are gathering more information before deciding what's next.

"Other jurisdictions have either decided to let the infection play out and see if a natural resistance does build up in the fish, or, in some places where they've seen population decline in the States, they've actually restocked with trout that have a resistance that have been bred in hatcheries," she said.

"I don't know if we would ever go that route in parks."

Locke Marshall, the superintendent for Waterton Lakes ºÃÉ«tv Park, said along with the ban on non-motorized watercraft from outside park boundaries, fishing for all species will no longer be permitted in flowing waters in the park, but will be allowed under current regulations in park lakes.

He said invasive zebra and quagga mussels that are present in other ºÃÉ«tv and U.S. jurisdictions pose a threat to Waterton Lakes and downstream infrastructure across southern Alberta.

He said if infestations start, they can cost millions to control.

Marshall said a mandatory inspection station for non-motorized boats has been operating since 2021 but only 56 per cent of watercraft users participated last year.

"The risk of aquatic invasive species spreading is too high to continue with this previous approach," he said.

This report by ºÃÉ«tvwas first published March 19, 2024.