Gravel chub (Erimystax x-punctatus) COSEWIC assessment and status report: chapter 1

Assessment Summary

Assessment Summary – April 2008

Common name : Gravel chub

Scientific name : Erimystax x-punctatus

Status : Extirpated

Reason for designation : The historic Canadian range of this small minnow was originally a single watershed in southern Ontario. The last record for this species was in 1958 despite extensive, repeated sampling at known sites and other areas of suitable habitat over the last 50 years. Ecosystem restoration of this watershed is underway; however, natural recolonization by the species is not possible because there are no adjacent populations in the Great Lakes watershed.

Occurrence : Ontario

Status history : Last recorded in Thames River drainage, Ontario in 1958. Designated Endangered in April 1985. Status re-examined and designated Extirpated in April 1987. Status re-examined and confirmed in May 2000 and April 2008. Last assessment based on an update status report.

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