The Manitoba government says zebra mussels could cause a national park lake to be closed

Parks Canada is considering closing a popular lake to boating because of zebra mussels, the Manitoba government says.

Provincial Natural Resources Minister Jamie Moses says the closure of Clear Lake in Mount Riding National Park will hurt tourism, the economy and the region's residents.

Musa says he wants the federal government to consult more with the people before making a final decision.

Parks Canada says live zebra mussels were found in the lake last November and the infestation could cause irreversible ecological damage to the lake and downstream waters.

Clear Lake is one of the biggest destinations for boaters in Manitoba, and zebra mussels can spread by attaching to boats.

Parks Canada says no zebra mussel environmental DNA was found during winter testing of the lake, but a decision has not yet been made on whether to use the lake this summer.

“Zebra mussels may still be present despite negative (environmental DNA) results,” says a statement on Parks Canada's website.

“Due to the complexity of the situation and the ongoing research, no decision has been made regarding the use of Clear Lake for 2024. Parks Canada is committed to making the best decision based on the available scientific evidence, combined with input from stakeholders.”

Manitoba's opposition Progressive Conservatives have called on the province to increase surveillance by adding boat inspection stations and more testing of downstream waterways, among other measures.