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COSEWIC Assessment and Update Status Report on the Deepwater Sculpin (Western and Great Lakes-Western St. Lawrence Populations) in Canada

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COSEWIC
Assessment Summary

Great Lakes - Western St. Lawrence Populations

Assessment Summary – April 2006

Common name:
Deepwater Sculpin

Scientific name:
Myoxocephalus Thompsonii

Status:
Special Concern

Reason for designation:
This species occurs in the deeper parts of 10 coldwater lakes, including lakes Superior, Huron and Ontario, in Ontario and Quebec.  Previously thought to be exterminated in Lake Ontario, it now appears to be reestablished in that lake, albeit in small numbers.  Populations have been exterminated in 2 lakes in Quebec due to eutrophication of these lakes, and may be in decline in Lake Huron, possibly in relation to the introduction of zebra mussel.

Occurrence:
Ontario, Quebec

Status history:
The "Great Lakes - Western St. Lawrence populations" unit (which includes the former "Great Lakes populations" unit designated Threatened in April 1987) was designated Special Concern in April 2006. Last assessment based on an update status report.

 

Western Populations

Assessment Summary – April 2006

Common name:
Deepwater Sculpin

Scientific name:
Myoxocephalus Thompsonii

Status:
Not at Risk

Reason for designation:
This species is widely distributed in western Canada where it is found in the deepest parts of at least 52 coldwater lakes in northwestern Ontario, Manitoba, Saskatchewan, Alberta and the Northwest Territories. There is no evidence to indicate population declines, or of any threats that would convey a degree of risk to these populations.

Occurrence:
Northwest Territories, Alberta, Saskatchewan, Manitoba, Ontario

Status history:
Designated Not at Risk in April 2006. Last assessment based on an update status report.