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Recovery Strategy for the Dwarf Wedgemussel (proposed)

Illustration of Draft Wedgemussels. J. Domm for Fisheries and Oceans Canada

Dwarf Wedgemussel


June 2007


Responsible Jurisdictions
Strategic Environmental Assessment Statement

Recovery of this species is considered not technically or biologically feasible at this time.

About the Species at Risk Act Recovery Strategy Series

What is the Species at Risk Act (SARA)?

SARA is the Act developed by the federal government as a key contribution to the common national effort to protect and conserve species at risk in Canada. SARA came into force in 2003 and one of its purposes is“to provide for the recovery of wildlife species that are extirpated, endangered or threatened as a result of human activity.”

What is recovery?

In the context of species at risk conservation, recovery is the process by which the decline of an endangered, threatened, or extirpated species is arrested or reversed and threats are removed or reduced to improve the likelihood of the species’ persistence in the wild. A species will be considered recovered when its long-term persistence in the wild has been secured.

What is a recovery strategy?

A recovery strategy is a planning document that identifies what needs to be done to arrest or reverse the decline of a species. It sets goals and objectives and identifies the main areas of activities to be undertaken. Detailed planning is done at the action plan stage.

Recovery strategy development is a commitment of all provinces and territories and of three federal agencies -- Environment Canada, Parks Canada Agency, and Fisheries and Oceans Canada -- under the Accord for the Protection of Species at Risk. Sections 37–46 of SARAoutline both the required content and the process for developing recovery strategies published in this series.

Depending on the status of the species and when it was assessed, a recovery strategy has to be developed within one to two years after the species is added to the List of Wildlife Species at Risk. Three to four years is allowed for those species that were automatically listed when SARA came into force.

What’s next?

In most cases, one or more action plans will be developed to define and guide implementation of the recovery strategy. Nevertheless, directions set in the recovery strategy are sufficient to begin involving communities, land users, and conservationists in recovery implementation. Cost-effective measures to prevent the reduction or loss of the species should not be postponed for lack of full scientific certainty.

The series

This series presents the recovery strategies prepared or adopted by the federal government under SARA. New documents will be added regularly as species get listed and as strategies are updated.

To learn more

To learn more about the Species at Risk Act and recovery initiatives, please consult the SARA Public Registry and the Web site of the Recovery Secretariat (http://www.speciesatrisk.gc.ca/recovery/).

Recommended citation:

Department of Fisheries and Oceans. 2007. Recovery Strategy for the Dwarf Wedgemussel (Alasmidonta heterodon) in Canada [Proposed]. Species at Risk Act Recovery Strategy Series. Department of Fisheries and Oceans, Ottawa. vi + 9 pp.


Additional copies:

Additional copies can be downloaded from the SARA Public Registry.

Cover illustration: J. Domm for Fisheries and Oceans Canada

Également disponible en français sous le titre :
« Programme de rétablissement pour l'alasmidonte naine (Alasmidonta heterodon) au Canada »

© Her Majesty the Queen in Right of Canada, represented by the Minister of Fisheries and Oceans, 2007. All rights reserved.

ISBN to come

Catalogue no. to come


Content (excluding the cover illustration) may be used without permission, with appropriate credit to the source.

Declaration (Recovery Not Feasible)

This proposed recovery strategy for the dwarf wedgemussel has been prepared in cooperation with the jurisdictions responsible for the species, as described in the Preface. The Department of Fisheries and Oceans (DFO) has reviewed and accepts this document as its recovery strategy for the dwarf wedgemussel as required by the Species at Risk Act (SARA).

The recovery of the dwarf wedgemussel in Canada has been found to be neither technically nor biologically feasible at this time. Because the population has been extirpated, recovery efforts targeted towards other species in the same geographic area or experiencing similar threats, general conservation programs in the same geographic area, and protection through SARA prohibitions protecting individuals of the species, their residences, and critical habitat will not be effective in this case. Recovery could only occur through reintroduction of the species, which is considered not feasible.

The feasibility determination will be re-evaluated as warranted in response to changing conditions and/or knowledge, in particular every five years as part of the mandatory report on implementation of the recovery strategy.

Responsible Jurisdictions

Under the Species at Risk Act, Fisheries and Oceans Canada is the responsible jurisdiction for the dwarf wedgemussel.


This document was prepared by Howard Powles (University of Ottawa), and has benefited by reviews from John Loch (Loch Consulting) and staff of Fisheries and Oceans Canada.


Drs Todd Morris, DFO and Janice Smith, Environment Canada, provided valuable guidance on recent literature and contacts with experts in freshwater mussel reestablishment. Drs. Jess Jones (US Fish and Wildlife Service), David Berg (Miami University, Hamilton, Ohio) and Richard J. Neves (Virginia Tech) provided valuable information on potential for recovering extirpated populations of freshwater mussels.

Strategic Environmental Assessment Statement

In accordance with the Cabinet Directive on the Environmental Assessment of Policy, Plan and Program Proposals, the purpose of a SEA is to incorporate environmental considerations into the development of public policies, plans, and program proposals to support environmentally-sound decision making.

Recovery planning is intended to benefit species at risk and biodiversity in general. However, it is recognized that strategies may also inadvertently lead to environmental effects beyond the intended benefits. The planning process based on national guidelines directly incorporates consideration of all environmental effects, with a particular focus on possible impacts on non-target species or habitats.

Because the dwarf wedgemussel is extirpated and recovery is deemed to be not feasible, no further recovery action is considered appropriate at this time. Accordingly, there will be no effect of this recovery strategy on the environment.


SARA defines residence as:

“a dwelling-place, such as a den, nest or other similar area or place, that is occupied or habitually occupied by one or more individuals during all or part of their life cycles, including breeding, rearing, staging, wintering, feeding or hibernating” [SARA S2(1)].

Residence protection is a SARA requirement that is separate from recovery strategy development as it relates to the general prohibitions under the Act (Section 33). To facilitate protection, residence descriptions, or the rationale for why the residence concept does not apply to a given species, are posted on the SARA public registry.

In the case of an extirpated species for which the recovery strategy does not recommend its reintroduction into the wild in Canada, the prohibition pertaining to the damage or destruction of residence does not apply [SARA S33].


Fisheries and Oceans Canada has led development of this recovery strategy for the dwarf wedgemussel. The development of the recovery strategy has involved: (i) the preparation of a draft addressing SARA requirements for recovery strategies for extirpated species; (ii) the circulation of this draft for review and comment by the provincial government of New Brunswick; (iii) public consultations on the draft strategy; and (iv) the finalisation of the proposed version for posting on the SARA public registry.

The determination that recovery is not feasible, including the justification, was reviewed as part of the review and consultation process for the recovery strategy. The final decision and wording of the determination were the responsibility of the DFO and took account of the comments received.

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