Manitoba has activated its Aquatic Invasive Species Early Detection Rapid Response Plan after multiple zebra mussel larvae were detected in Lake of the Prairies.
The lake is shared by Manitoba and Saskatchewan.
The detections were made through Manitoba’s routine surveillance program and confirmed through follow-up monitoring, prompting the two provinces to establish a joint incident command structure with support from Fisheries and Oceans Canada.
The next steps include developing a targeted monitoring plan to better understand the extent of the detection and a multi-jurisdictional containment plan.
Manitoba Environment and Climate Change said all water users leaving Lake of the Prairies must decontaminate their watercraft and water-related equipment before launching in another waterbody.
The province’s annual watercraft inspection program is also underway, with inspection stations operating across Manitoba from late spring through the summer and into mid-fall.
Anyone transporting a motorized or non-motorized watercraft over land must stop at all open inspection stations along their route.
Inspectors check watercraft and related equipment to ensure they have been properly cleaned, drained and dried. They can also demonstrate proper cleaning procedures, answer questions about aquatic invasive species and provide on-site decontamination when required.
The Manitoba Wildlife Federation said the detection underscores the need to protect Northern Manitoba, where much of the region remains free of aquatic invasive species.
Citizens for Protecting Our Northern Waterways, a northern Manitoba advocacy group, said zebra mussels and spiny waterflea are among the major aquatic invasive species threats facing the region.
Zebra mussels can attach to boats, docks and water intake pipes, while also affecting aquatic ecosystems and fish populations. Spiny waterflea consume zooplankton, an important part of the aquatic food chain.
Both organizations are urging water users to follow the “Clean, Drain, Dry” approach before moving between waterbodies.
Citizens for Protecting Our Northern Waterways said all watercraft, including boats, canoes, kayaks, stand-up paddleboards and inflatables, must stop at open inspection stations. Water-related equipment such as anchors and fishing gear can also be inspected.
The group said northern Manitoba remains largely free of aquatic invasive species, although zebra mussels and other invasive species have been detected in several Manitoba waterbodies.
The Manitoba Wildlife Federation said it plans to continue working with Citizens for Protecting Our Northern Waterways, governments and other stakeholders to push for additional measures to prevent the spread of aquatic invasive species.
For water users, officials say the most important step is to clean, drain and dry watercraft and equipment before moving to another lake or river.
By Steven Sukkau, Local Journalism Initiative Reporter
Original Published on Aug 18, 2026 at 20:54
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