Research Document - 2013/083
Information in support of a recovery potential assessment of Western Silvery Minnow (Hybognathus argyritis) in Canada
By Watkinson, D.A.
Abstract
The Western Silvery Minnow (Hybognathus argyritis) was listed as Threatened on Schedule 1 of Canada’s Species at Risk Act (SARA) in 2003. In April 2008, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) re-assessed and designated Western Silvery Minnow as Endangered because this species is restricted to the Milk River in southern Alberta where changes in flow resulting from recurring drought conditions and the St. Mary’s diversion have the potential to significantly affect the survival of the species (COSEWIC 2008). Before deciding whether to up-list Western Silvery Minnow to Endangered on Schedule 1, the Science sector in Fisheries and Oceans Canada (DFO) was asked to undertake a Recovery Potential Assessment (RPA); this Research Document supports the RPA. It describes the current state of knowledge of the biology, ecology, distribution, abundance and trends of Western Silvery Minnow in Alberta. Identification of threats to both the minnow and its habitat, and potential measures to mitigate these impacts, are also reported. This information may be used to inform the development of recovery documents, and to support decision-making with regards to up-listing and the issuance of permits, agreements and related conditions under the SARA.
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