Terms of Reference

Proposed Treatment for Lake Winnipeg Zebra Mussel

Regional Science Response Process – Central and Arctic Region

April 2014
Winnipeg, MB

Chairperson: Kathleen Martin

Context

The Zebra Mussel (Dreissena polymorpha), a native to the Black and Caspian seas region in Southeastern Europe, has a long history of invasion in freshwaters of both Europe and North America. The species has had a large economic and ecological impact where it has become established including elsewhere in Canada. Zebra Mussel was first discovered in the Red River basin in the United States in about 2009.  In October 2013, the species was found in Lake Winnipeg, Manitoba.

The Province of Manitoba has implemented a Rapid Response Protocol in an attempt to eradicate and suppress the spread of the species. To that end, they have requested the closure of four Small Craft Harbours in Lake Winnipeg for a period following ice-out in spring 2014 to apply a liquid potash treatment to kill the Zebra Mussel found there.

Fisheries and Oceans Canada’s (DFO) Small Craft Harbours has requested Science information and advice on this request.

Objectives

Specifically, they have asked the following questions:

1. Does DFO Science support the Manitoba Zebra Mussel Science Advisory Committee's recommendation to eradicate/suppress Zebra Mussels at four Small Craft Harbour sites on Lake Winnipeg by isolating the harbours and applying a liquid potash treatment? 
2. If yes, does DFO Science support the recommended timing window i.e. early spring (after ice-out but before water temperatures reach 10 °C, April-early May) for the eradication/suppression treatment to be carried out? 
3. Has DFO Science identified and reviewed alternative treatment options?

Expected Publication

• Science Response

Participation

• Fisheries and Oceans Canada (DFO) (Science sector)
• Manitoba Conservation and Water Stewardship
• Other invited experts