Response Statements

Response Statement - Threehorn Wartyback

This rare species historically occurred in the Great Lakes drainages including Lake St. Clair, western Lake Erie, and the Grand, Thames, and Detroit rivers. The species has not been found since 1992 in Lake St. Clair and the Detroit River and may be extirpated there due largely to the impacts of Zebra and Quagga mussels. It was last recorded from the Canadian side of Lake Erie in 1997. Pollution (sediment loading, nutrient loading, contaminants and toxic substances) related to both urban and agricultural activities represents a high and continuing threat at the three remaining riverine locations.


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Contact Person(s)

Caroline Ladanowski
Wildlife Management and Regulatory Affairs
Canadian Wildlife Service
Environment Canada
351 Saint-Joseph Boulevard
Gatineau, QC
K1A 0H3
Tel: 800-668-6767
Fax: --
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Related Species


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