Northern brook lamprey (Ichthyomyzon fossor) COSEWIC assessment and status report: chapter 1
Assessment Summary
Assessment Summary – April 2007
Common name: Northern Brook Lamprey - Great Lakes - Upper St. Lawrence Populations
Scientific name: Ichthyomyzon Fossor
Status: Special Concern
Reason for designation: This nonparasitic lamprey is distributed in streams throughout the Great Lakes basin (except Lake Ontario) and in southwestern Quebec. In the Great Lakes basin, which comprises most of its range, about 50% of the streams it is known to inhabit are subjected to ongoing chemical treatment for sea lamprey control which causes mortality to its larval stage. However, in untreated streams, the species is still abundant.
Occurrence: Ontario, Quebec
Status history: The species was considered a single unit and designated Special Concern in April 1991. When the species was split into separate units in April 2007, the "Great Lakes - Upper St Lawrence populations" unit was designated Special Concern. Last assessment based on an update status report.
Assessment Summary – April 2007
Common name: Northern Brook Lamprey - Saskatchewan - Nelson Population
Scientific name: Ichthyomyzon Fossor
Status: Data Deficient
Reason for designation: This nonparasitic lamprey has not been the subject of any targeted and comprehensive survey since it was first reported from Manitoba in the late 1970s, and accordingly, the distribution and status of its populations are not well known.
Occurrence: Manitoba
Status history: The species was considered a single unit and designated Special Concern in April 1991. When the species was split into separate units in April 2007, the "Saskatchewan-Nelson population" unit was designated Data Deficient. Last assessment based on an update status report.
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