Deepwater sculpin (Myoxocephalus thompsonii), various populations: chapter 1
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.
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