Species Profile

Round Hickorynut

Scientific Name: Obovaria subrotunda
Taxonomy Group: Molluscs
COSEWIC Range: Ontario
COSEWIC Assessment Date and Status Change: May 2013
COSEWIC Status: Endangered
COSEWIC Status Criteria: A2ace; B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)
COSEWIC Reason for Designation: The Canadian population of this species has declined by 75-95% over the last 10 years, with an estimated 99% decline over the last 30 years. Populations in the Grand and Thames rivers are extirpated and populations in the Sydenham River and Lake St. Clair have declined to very low levels. Losses and declines are due to the combined effects of pollution from agriculture and residential runoff, and the impacts of invasive species like the Zebra Mussel.
COSEWIC History of Status Designation: Designated Endangered in May 2003. Status re-examined and confirmed in May 2013.
SARA Status: Schedule 1, Endangered
Date of Listing (yyyy-mm-dd): 2005-01-12

Please note that this information is provided for general information purposes only. For the most up to date and accurate list of species listed under the Species at Risk Act, please see the Justice Laws Website.

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Quick Links: | Photo | Description | Distribution and Population | Habitat | Biology | Threats | Protection | Recovery Initiatives | Recovery Team | National Recovery Program | Documents

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Round Hickorynut Photo 1

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Description

The Round Hickorynut is a freshwater mussel that grows to a maximum length of about 60 mm in Canada. It is easily distinguished from other Canadian mussel species by its almost perfectly round shape. The shell is thick, solid, and dark brown with a band of lighter coloration along the posterior dorsal surface.

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Distribution and Population

In the United States, the Round Hickorynut is known from the Ohio River system, including the Tennessee and Cumberland rivers. In Canada, the Round Hickorynut now occurs only in southern Ontario, and is restricted to the Lake St. Clair delta and the Sydenham River. The Round Hickorynut is a very uncommon species that is clearly declining throughout most of its North American range, and has been lost from approximately 90% of its former range in Canada. It has disappeared from Lake Erie, the Detroit River, and the offshore waters of Lake St. Clair. It has also been lost from the Grand and Thames rivers, and has significantly declined in the Sydenham River. The only significant population left in Canada occurs in the shallow waters of the Lake St. Clair delta, but it is not known if the population will continue to survive.

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Habitat

The preferred habitat of the Round Hickorynut is generally described as freshwater with steady, moderate flows and sand and gravel bottoms, at depths of up to 2 m. In southeastern Michigan and southwestern Ontario, however, it has mainly been found in murky, low-gradient rivers with clay/sand or clay/gravel substrates. In Lake St. Clair, it currently occupies shallow (<1 m) nearshore areas with firm, sandy substrates.

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Biology

The Round Hickorynut has separate sexes and females are smaller than the males. The lifespan of individuals is probably at least 10 years. Like other freshwater mussels, Round Hickorynut is parasitic on fish during its larval stage. Spawning occurs in the summer, and the female mussel holds the embryos over winter until they reach the larval stage the following June. The larvae are then released into the water, where they attach to the gills of an appropriate fish host and form a cyst. After a period of time, the larvae transform into juveniles that drop off the fish and fall to the substrate to begin life as free-living mussels. The host fish for the Round Hickorynut is unknown, but may be the Eastern Sand Darter, Ammocrypta pellucida. As adults, these mussels are essentially sessile — their movements are limited to a few metres of the lake or river bottom. The only time this species can disperse is during the parasitic phase. Round Hickorynuts, like all freshwater mussels, feed on bacteria and algae that they filter from the water with their gills.

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Threats

The introduction and spread of the Zebra Mussel resulted in the loss of the Round Hickorynut from most of its former range in the Great Lakes, and has put the remaining population in the Lake St. Clair delta at risk. Populations in the Grand and Thames rivers were likely extirpated due to the combined effects of sewage pollution and agricultural impacts in these heavily populated watersheds. The decline of the Sydenham River population is likely due to agricultural impacts. Predation by muskrats or raccoons may also play a role. If the Eastern Sand Darter is the host of the Round Hickorynut, then the decline of this Threatened fish would affect the survival of the mussel as well.

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Protection

Federal Protection

The Round Hickorynut is protected under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available in the Species at Risk Act: A Guide.

Provincial and Territorial Protection

To know if this species is protected by provincial or territorial laws, consult the provinces' and territories' websites.

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Recovery Initiatives

Status of Recovery Planning

Recovery Strategies :

Name Recovery Strategy for the Round Hickorynut (Obovaria subrotunda) and Kidneyshell (Ptychobranchus fasciolaris) in Canada
Status Final posting on SAR registry

Name (Amended) Recovery Strategy for the Round Hickorynut (Obovaria subrotunda) and Kidneyshell (Ptychobranchus fasciolaris) in Canada
Status Final posting on SAR registry

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Recovery Team

Ontario Freshwater Mussel Recovery Team

  • Todd Morris - Chair/Contact - Fisheries and Oceans Canada
    Phone: 905-336-4734  Fax: 905-336-6437  Send Email

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Documents

PLEASE NOTE: Not all COSEWIC reports are currently available on the SARA Public Registry. Most of the reports not yet available are status reports for species assessed by COSEWIC prior to May 2002. Other COSEWIC reports not yet available may include those species assessed as Extinct, Data Deficient or Not at Risk. In the meantime, they are available on request from the COSEWIC Secretariat.

102 record(s) found.

Reports on the Progress of Recovery Document Implementation

COSEWIC Status Reports

  • COSEWIC assessment and update status on the round hickorynut Obovaria subrotunda in Canada (2013-12-31)

    The round hickorynut, Obovaria subrotunda (Rafinesque, 1820), is a small freshwater mussel (maximum length in Canada ~ 60 millimeters) that is easily distinguished from other Canadian species by its almost perfectly round shape. The shell is thick, solid, and dark brown in colour, with a band of lighter colouration along the posterior dorsal surface.

Response Statements

  • Response Statement - Round Hickorynut (2013-12-18)

    The Canadian population of this species has declined by 75-95% over the last 10 years, with an estimated 99% decline over the last 30 years. Populations in the Grand and Thames rivers are extirpated and populations in the Sydenham River and Lake St. Clair have declined to very low levels. Losses and declines are due to the combined effects of pollution from agriculture and residential runoff, and the impacts of invasive species like the Zebra Mussel.
  • Response Statements - Round Hickorynut (2004-04-21)

    A response statement is a communications document that identifies how the Minister of the Environment intends to respond to the assessment of a wildlife species by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). The document provides a start to the listing and recovery process for those species identified as being at risk, and provides timelines for action to the extent possible.

Recovery Strategies

  • Recovery Strategy for the Round Hickorynut (Obovaria subrotunda) and Kidneyshell (Ptychobranchus fasciolaris) in Canada (2013-10-25)

    The Ontario Freshwater Mussel Recovery Team (OFMRT) was formed in the spring of 2003 to address concerns about the status of Ontario's freshwater mussel populations and to begin to address the recovery planning obligations under Canada's new Species at Risk Act (SARA). The National Recovery Strategy for the Round Hickorynut and the Kidneyshell was developed by the OFMRT using the best available information in an effort to reduce the threats, prevent their extirpation and, if possible, to restore these species to healthy, self-sustaining levels. In recognition of the degree of overlap between these species in both their historical and current distributions, as well as the commonality of threats, the OFMRT has adopted a multi-species approach to the recovery of these species.

Action Plans

  • Action Plan for the Sydenham River in Canada: An Ecosystem Approach (2018-05-24)

    The Sydenham River in southwestern Ontario supports an amazing diversity of aquatic life. Located in the lower Great Lakes basin, the river contains the greatest diversity of freshwater mussel species of any watershed in Canada. At least 34 species of mussels and 80 species of fishes have been found here. Many of these species are rare and seventeen species, including eleven mussels and six fishes, have been assessed by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) as Endangered, Threatened or Special Concern. The majority of these species are protected under the federal Species at Risk Act (SARA) and seven freshwater mussels (Round Hickorynut, Kidneyshell, Northern Riffleshell, Snuffbox, Round Pigtoe, Rayed Bean and Salamander Mussel) and two fishes (Eastern Sand Darter – Ontario population and Northern Madtom) are the focus of this action plan. The needs of these at risk fishes and mussels within the Sydenham River watershed will be addressed using a multi-species, ecosystem-based approach. The present plan is guided by four SARA recovery strategies for these nine species and builds on the ecosystem-based Sydenham River Recovery Strategy completed in 2003.

Orders

  • Order Acknowledging Receipt of the Assessments Done Pursuant to Subsection 23(1) of the Species at Risk Act (2004-04-21)

    This Order acknowledges receipt by the Governor in Council of the assessments of the status of wildlife species done pursuant to subsection 23(1) of the Species at Risk Act (SARA) by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC). The purpose of SARA is to prevent wildlife species from being extirpated or becoming extinct, to provide for the recovery of wildlife species that are extirpated, endangered or threatened as a result of human activity and to manage species of special concern to prevent them from becoming endangered or threatened.
  • Order Amending Schedules 1 to 3 to the Species at Risk Act (volume 139, number 2, 2005) (2005-01-12)

    Schedule 1, the List of Wildlife Species at Risk of the Species at Risk Act (SARA), is amended by Order of the Governor in Council (GIC), on the recommendation of the Minister of the Environment, by the addition of 73 species. This Order is based on scientific assessments by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) and follows consultations with provincial and territorial governments, Aboriginal peoples, stakeholders and the public, and analysis of costs and benefits to Canadians.

COSEWIC Annual Reports

  • COSEWIC Annual Report – 2012-2013 (2013-09-24)

    Under Canada’s Species at Risk Act (SARA), the foremost function of COSEWIC is to “assess the status of each wildlife species considered by COSEWIC to be at risk and, as part of the assessment, identify existing and potential threats to the species”. COSEWIC held two Wildlife Species Assessment Meetings in this reporting year (October, 2012 to September 2013) from November 25 to November 30, 2012 and from April 28 to May 3, 2013. During the current reporting period, COSEWIC assessed the status or reviewed the classification of 73 wildlife species. The wildlife species assessment results for the 2012-2013 reporting period include the following: Extinct: 0 Extirpated: 2 Endangered: 28 Threatened: 19 Special Concern: 19 Data Deficient: 4 Not at Risk: 1 Total: 73 Of the 73 wildlife species examined, COSEWIC reviewed the classification of 50 species that had been previously assessed. The review of classification for 26 of those species resulted in a confirmation of the same status as the previous assessment.

Permits and Related Agreements

  • Explanation for issuing permit(#-CA SECT 73 SARA C&A 09-012), persuant to the provisions of section 73 of SARA (2009-05-29)

    The purpose of the project is to determine the sensitivity of the early life stages (glochidia) of endangered species of freshwater mussels to salt (NaCl and road salt).
  • Explanation for issuing permit(#: DFO-CA SECT 73 SARA C&A 10-002 ), persuant to the provisions of section 73 of SARA (2010-03-25)

    The Medway Sanitary Trunk Sewer project involves the installation of a sanitary trunk along the Medway Valley to service the communities in north London. Phase 2B of the Medway Sanitary Trunk Sewer is the final extension of the Medway trunk sewer. Phase 2A was constructed in 2007 and involved two crossings and associated mussel relocation and monitoring. The current phase, 2B, involves three crossings on Medway Creek and associated mussel relocation and monitoring. The total estimated prescribed search area for all three crossings is 1828 m2. In addition to the three crossing sites, two other areas need to be searched for mussels, including the relocation area and a control area. The presence of mussels in these areas will be documented to assess the potential impact, if any, of relocated mussels on the population of mussels already living in the relocation sites. Growth and survival of relocated mussels will be monitored and compared to mussels endemic to the relocation site (i.e., control mussels) at one month, one year and two years post re-location.
  • Explanation for issuing permit(#17-PCAA-00001), persuant to the provisions of section 73 of SARA (2017-03-10)

    The St. Clair Region Conservation Authority (SCRCA) is sampling fish and mussels in several locations for presence/absence data. Currently, fish and mussel data is lacking in these areas. Baseline data will be collected to assist in future project proposals and inquiries. Benthic sampling will be undertaken for watershed characterization to allow the SCRCA to assess water quality throughout the watershed. Data obtained will assist the SCRCA in the identification of potential rehabilitation sites and impact monitoring.
  • Explanation for issuing permit(#17-PCAA-00004), persuant to the provisions of section 73 of SARA (2017-03-29)

    The objective of the project is to apply selective lampricide to assess and control Sea Lamprey populations in the Great Lakes. Assessment surveys are routinely conducted in tributaries and lentic areas to determine the presence, distribution, and abundance of Sea Lamprey larvae. In deep water (>0.8 m) areas, surveys are conducted with the application of granular Bayluscide, a bottom-release formulation of lampricide, within the demarcated boundaries of the plots with a standard area of 500 m2. Tributaries harbouring larval Sea Lamprey are treated periodically with lampricides to eliminate or reduce larval populations before they recruit to the lake as feeding juveniles. The treatment units administer and analyze TFM, or TFM/Niclosamide mixtures (TFM augmented with Bayluscide 70% wettable powder or 20% emulsifiable concentrate) during stream treatments, and apply 3.2% granular Bayluscide (gB) to control populations inhabiting lentic areas.
  • Explanation for issuing permit(#17-PCAA-00009), persuant to the provisions of section 73 of SARA (2017-04-10)

    The objective of the project is to conduct freshwater mussel surveys and monitoring in Central and Arctic Region. 1) Quantitative sampling - historical monitoring stations on the Thames and Maitland rivers will be revisited and sampling completed during the initial round of monitoring (2005) will be repeated; 2) Semi-quantitative sampling - sampling at Little Bear Creek and Walpole Island will be undertaken using habitat appropriate methods (wading, visual/tactile, searches, calm rakes, etc.); 3) Identification workshop - the workshop will take place in late June over a two-day period. The first day is a laboratory component working with preserved specimens. The second day is spent on-site at a location in the Sydenham River where attendees will develop and practise field identification skills under the guidance of experienced malacologists; 4) Genetic sampling - depending on which species are detected during sampling, it may be necessary to collect genetic samples for further analyses; 5) Depending on which species are found during sampling, it may be necessary to subsample to evaluate the reproductive state of individuals; and, 6) Tagging - when necessary some individuals may be tagged for future identification, using non-invasive tagging techniques.
  • Explanation for issuing permit(#18-HCAA-01367 ), persuant to the provisions of section 73 of SARA (2019-08-22)

    The activities authorized by this permit that may cause incidental harm to Kidneyshell (Ptychobranchus fasciolaris), Round Hickorynut (Obovaria subrotunda), and Round Pigtoe (Pleurobema sintoxia) consist of the capture and relocation of species at risk mussels within the prescribed search area of approximately 2,295 m2, which includes the overall cofferdam footprint of 1,442 m2 and a buffer, in the Welland River, during isolation of in-water work areas, cofferdam installation, and dewatering activities. The effects that the activity may cause to the listed species, their critical habitat, and the effects of those changes authorized by the permit include the incidental harm, harassment, or death of Kidneyshell, Round Hickorynut, and Round Pigtoe resulting from their capture, processing, and relocation.
  • Explanation for issuing permit(#19-HCAA-00700 ), persuant to the provisions of section 73 of SARA (2019-08-06)

    Phragmites australis is an invasive species that is expanding exponentially in Long Point Bay and Rondeau Bay, displacing native species and limiting critical habitat for numerous species at risk. A method that has been used in the United States but is relatively new to Canada includes applying a custom made herbicide, RoundUp (active ingredient glyphosate), with AquaSurf (a surfactant), which has been shown to be effective at reducing Phragmites density and spread. This project is an extension of the works that the Ontario Ministry of Natural Resources and Forestry (OMNRF) conducted in 2016, 2017 and 2018 in Long Point Bay and Rondeau Bay as part of a 5-year pilot project to determine the effectiveness of this method in Canada. The current proposal is to treat a total of 48 hectares in the following locations in Rondeau Bay and Long Point Bay by ground application: Rondeau Provincial Park (10 ha), Long Point Bay (5 ha), Turkey Point Region (1 ha), Lower Big Creek Marshes (6 ha), Big Creek Watershed (20 ha), North Shore of the Inner Bay (6 ha), and as required where regrowth is observed in Long Point Bay. This activity may result in the incidental harm, harassment, or death of Eastern Pondmussel (Ligumia nasuta), Round Pigtoe (Pleurobema sintoxia), Lake Chubsucker (Erimyzon sucetta), Pugnose Shiner (Notropis anogenus), Kidneyshell (Ptychobranchus fasciolaris), Rainbow (Villosa iris), Round Hickorynut (Obovaria subrotunda), Mapleleaf (Great Lakes - Upper St. Lawrence River populations) (Quadrula quadrula), Spotted Gar (Lepisosteus oculatus), or Eastern Sand Darter (Ammocrypta pellucida) (Ontario populations) resulting from the application of herbicide, use of heavy equipment for spraying by ground, or oxygen depletion from vegetative die-off.
  • Explanation for issuing permit(#19-PCAA-00008), persuant to the provisions of section 73 of SARA (2019-04-29)

    The objectives of the activities covered by this permit are: 1) To conduct quantitative and semi-quantitative surveys for species at risk mussels at sites at locations across southern Ontario to track changes in species and habitat over time, and evaluate recovery efforts; 2) To hold a mussel identification workshop in late June over a two-day period. The second day will be spent at a site on the Sydenham River where attendees will practice field identification skills under guidance of experienced malacologists; 3) Depending on species detected during qualitative and semi-quantitative sampling, to obtain genetic samples for further analyses, and to evaluate reproductive condition of animals found; 4) To conduct a morphometric analyses on animals collected during quantitative and/or semi-quantitative sampling; and, 5) To tag some individuals when necessary for future identification. These activities will involve the capture of all mussel species listed on the permit, via quadrat sampling or timed searches, from sites listed on the permit. For quantitative sampling, substrates in 1 m x 1 m quadrats will be excavated by hand. For all sampling, any mussels found will be identified and processed (count, measure, morphometric analyses, tagging, obtaining genetic samples, etc.). All mussels will be returned alive to the locations they were found after processing.
  • Explanation for issuing permit(#19-PCAA-00011), persuant to the provisions of section 73 of SARA (2019-04-29)

    The objectives of the activities covered by this permit are to conduct fish and mussel surveys in the St. Clair River watershed and the Lake St. Clair watershed. Collected baseline data will be used to assist in future project proposals and inquiries. The activities authorized by this permit consist of the capture of any of the species listed on this permit from the St. Clair River watershed and the Lake St. Clair watershed, which will require the handling of any of the species listed on this permit for the purposes of identification and processing (count, photograph, etc.). Fishes will be released alive with the exception of some smaller fishes that may be retained to confirm identification. All mussels will be returned alive to the locations they were found. Sampling will be completed through the use of a backpack electrofishing unit, seine net, or minnow traps where necessary, using the Ontario Stream Assessment Protocol (OSAP). Mussel surveys will adhere to Mackie et al. (2008).
  • Explanation for issuing permit(#19-PCAA-00016), persuant to the provisions of section 73 of SARA (2019-05-13)

    The objectives of the activities covered by the permit are to conduct a survey (seining and trawling) of the East Sydenham River to determine if Northern Madtom (Noturus stigmosus) still exists in this watershed. Previous recent surveys have been unsuccessful in detecting this species. The last known record of Northern Madtom in the East Sydenham River was from 1929 near Alvinston, Ontario, and from 1975 near Florence, Ontario. The other species listed on the permit may be captured incidentally during the surveys. The activities authorized by the permit consist of the capture of Northern Madtom from the East Sydenham River using a small mesh trawl and/or a small mesh seine net. The gear type used will depend on habitat conditions and water levels at each site. Identification and processing will involve the handling of Northern Madtom (count, measure, photograph etc.). After fishes are processed (identified, measured) they will be released back to the river, alive. Vouchers will be collected using digital cameras, but some vouchers of smaller fishes may be retained in 10% formalin to confirm identification, if digital vouchers cannot be collected. These survey activities may result in the incidental capture and handling of Eastern Sand Darter (Ammocrypta pellucida) and the species at risk mussels listed on the permit, for the purposes of identification and processing (count, measure, photograph etc.). Any species at risk incidentally captured will be returned alive to the location of capture.
  • Explanation for issuing permit(#19-PCAA-00020), persuant to the provisions of section 73 of SARA (2019-05-13)

    The objectives of the activities covered by the permit are: 1) to study post-excystment juvenile unionid mussel dispersion; 2) to study the effects of multiple stressors on unionid mussel suspension feeding; 3) to study the effect of shear stress on juvenile unionid settlement; 4) to study the association between flow velocity and shell orientations and morphometrics; and, 5) to study the physical conditions present in mussel beds. The species listed on the permit may be captured incidentally during this work. The activities authorized by the permit consist of the incidental capture of species listed on the permit from the Ausable, Grand, Sydenham, and Thames rivers. For the juvenile studies, excavations along a transect across the river will be undertaken using an airlift system that will vacuum up the fine sediments and any juvenile mussels in a 12 x 12 cm quadrat. The excavated material will be carefully processed through a series of sieves to define size classes of sediment. For feeding studies, species will be collected via three possible methods: "raccooning" and excavation; manual sieving through the sediment; and, visual searching (depending on water clarity). These activities will involve the handling of the species listed on the permit for the purposes of identification and processing (count, measure, marking, photograph etc.). Any juveniles found will be measured, photographed, and, along with the sediment, returned to their original place along the transect. All mussel species at risk, once identified, will be measured, marked and returned to the spot where they were collected. The marking is completed with a metal probe that is used to etch the periostracum of the shell (with a unique number), which does not harm the mussel.
  • Explanation for issuing permit(#19-PCAA-00038 ), persuant to the provisions of section 73 of SARA (2019-05-30)

    The objective of the activities covered by the permit is to sample municipal drains for the purpose of classifying unrated drains following the Classifying Ontario Municipal Drains Protocol (Fisheries and Oceans Canada). As fisheries assessments have not been previously conducted on many unrated municipal drains, the species listed on the permit may inhabit these drains and may be captured incidentally during the course of the work. The activities authorized by the permit include: 1. The incidental capture of species at risk (SAR) from the locations listed on the permit using seine nets and/or backpack electrofishing units. Within each sample site, approximately 40 m or 10x the wetted width of the watercourse will be sampled for fishes using either a backpack electrofisher, or a seine net depending on habitat suitability. Within the sample site, block nets will be set up and a minimum of three passes will be completed; 2. The handling of the listed SAR for the purposes of identification (count, measure, photograph, etc.). With the exception of vouchers that may be retained to confirm identification, all fishes will be released alive after processing. Vouchers will be collected using digital cameras for larger fishes and all mussels; however, some vouchers of smaller fishes may be retained in 10% formalin or 95% ethanol to confirm identification (if digital vouchers cannot be collected); and, 3. The possession and transport of any of the listed species that are killed incidentally or for vouchering purposes, preserved in 10% formalin or 95% ethanol.
  • Explanation for issuing permit(#19-PCAA-00041 ), persuant to the provisions of section 73 of SARA (2019-06-17)

    The objective of the activities covered by the permit are to conduct habitat assessments and survey for species at risk mussels in areas where in-water works are proposed at various locations across Ontario. The species listed on the permit may be captured incidentally during the course of this work. The activities authorized by the permit include: 1. The capture of the species listed on the permit via visual search using viewing boxes and raccooning, from various waterbodies throughout Ontario; 2. The handling of the species listed on the permit for the purposes of identification and photographing; and, 3. The possession and transport of dead specimens/shells/valves of any of the species listed on the permit found during the course of the sampling.
  • Explanation for issuing permit(#20-PCAA-00007 ), persuant to the provisions of section 73 of SARA (2020-03-16)

    Under the guidance of Fisheries and Oceans Canada (DFO), the activity involves: 1) establishing a network of permanent monitoring stations throughout historical and present ranges of the Sydenham River, to permit tracking of fish populations, analysis of trends and patterns, and permit the evaluation of recovery actions; 2) establishing and implementing a habitat monitoring program that includes water quality and substrate components. The monitoring program will provide insight into the significance of threat factors. Targeted species at risk fish sampling will be conducted in historically occupied habitat (river reaches in the vicinity of Florence and Alvinston), as well as other potentially suitable habitats, using sampling techniques proven to detect species at risk fishes; and, 3) starting in 2020 and following the guidance of DFO, conduct a spatial pattern study of mussel distribution by completing a systematic survey in a specific reach (or reaches) in order to better understand population abundance/density and species-to-habitat relationships in the Sydenham The St. Clair Region Conservation Authority (SCRCA) will collect fishes using a backpack electrofishing unit, seine net, or minnow traps where necessary, using the Ontario Stream Assessment Protocol. Mussel surveys will adhere to protocol found in Mackie et al. (2008). Fifteen sites will be monitored according to the Ontario Benthos Biomonitoring Network Protocol. At each site, this protocol involves using the travelling kick and sweep method for three minutes, covering an area of about 10 m2 at three transects (optimally riffle-pool-riffle) within a stream meander wavelength. The sites are selected to represent the main watercourse. Each of the small watercourses has at least one sampling site.
  • Explanation for issuing permit(#20-PCAA-00009 ), persuant to the provisions of section 73 of SARA (2020-04-03)

    The objectives of the activities covered by the permit are: 1. To conduct quantitative and semi-quantitative surveys for species at risk mussels to track changes in species and habitat over time, and evaluate recovery efforts. Surveys will be conducted in the St. Clair River and tributaries, the Sydenham, Thames, Grand, and Ottawa rivers, with other locations in lakes Huron, Erie, and Ontario, which may be sampled in the event the need arises. Drift samples may be taken at a subset of sites to evaluate timing of glochidial release. Species listed on the permit may be captured during this work; 2. To hold a mussel identification workshop in late June over a two-day period. The second day will spent at a site on the Sydenham River where attendees will practice field identification skills under guidance of experienced malacologists; 3. Depending on the species detected during qualitative and semi-quantitative sampling, to obtain genetic samples for further analyses; 4. To conduct a morphometric analyses on animals collected during quantitative and/or semi-quantitative sampling; 5. Depending on the species detected during qualitative and semi-quantitative sampling, to evaluate reproductive condition of animals found; and, 6. To tag some individuals when necessary for future identification. The activities authorized by the permit consist of: 1. The capture of all mussel species listed on the permit, via quadrat sampling or timed searches, from the locations listed above. For quantitative sampling, substrates in 1 x 1 m quadrats will be excavated by hand. For all sampling, any mussels found will be identified to species and measured; 2. The handling of the species listed on the permit for the purposes of identification and processing (count, measure, morphometric analyses, tagging, and obtaining genetic samples); and, 3. The possession and transport of any of the species listed on the permit killed incidentally or for vouchering purposes.
  • Explanation for issuing permit(#20-PCAA-00012 ), persuant to the provisions of section 73 of SARA (2020-04-03)

    The objectives of the activities covered by the permit are to test and apply the gear (i.e., mussel brail) required to delineate areas of protected habitat for species at risk mussels in non-wadeable habitats in the Sydenham, Thames, and Grand rivers. The species listed on the permit may be captured in the course of the work. The activities authorized by the permit consist of: 1. The capture of the mussels listed on the permit using a mussel brail within the Sydenham, Thames, and Grand rivers. Surveys at randomly distributed sampling sites (25 sites in each river) will be done by towing a brail along three transects. Individual brail tows, each representing a different length (50, 75, or 100 m) will be done at each site; 2. The handling of the species listed on this permit for the purposes of identification and processing (count, measure, and photograph). Digital vouchers will be taken of any mussels captured; all mussels will be returned alive to the location of capture; and, 3. The possession and transport of any of the species listed on this permit killed incidentally.
  • Explanation for issuing permit(#20-PCAA-00024 ), persuant to the provisions of section 73 of SARA (2020-06-18)

    The objectives of the activity covered by the permit are to survey mussels, as part of a Master's project, to better understand mussel interactions with other aquatic species. The species listed on the permit may be captured during this work. The activities authorized by the permit consist of: 1. The capture of the species listed on the permit via timed search or quadrat surveys from the Sydenham River watershed and Lake St. Clair delta; 2. The handling of the species listed on the permit for the purposes of identification (count, measure, and photograph). All mussels will be returned alive to the location of capture following processing; and, 3. The possession and transport of any of the species listed on the permit killed incidentally.
  • >> See more Permits and Related Agreements documents

Consultation Documents

  • Consultation on Amending the List of Species Under the Species at Risk Act - Central & Arctic Region (2004-04-19)

    Your opinion is being sought to assist the government of Canada in making an informed decision on whether to add the Northern Madtom, Pugnose Shiner, Kidneyshell, Round Hickorynut, Lake Winnipeg Physa Snail, Channel Darter, Shortjaw Cisco, and Atlantic Cod (Arctic population) to the Schedule 1 (the List of Wildlife Species at Risk) of the Species at Risk Act (SARA). Your input on the impacts of adding these species to the List is important. This workbook has been developed to give you an opportunity to provide Fisheries and Oceans Canada with your feedback, advice, and other comments regarding adding these species to Schedule 1 of SARA (Schedule 1 identifies which species are legally protected under SARA).

Critical Habitat Orders

Recovery Document Posting Plans

  • Recovery Document Posting Plan - Fisheries and Oceans Canada - Fiscal Year 2016-2017 (2018-09-28)

    Under the Species at Risk Act (SARA), the competent Minister(s) must prepare a recovery strategy within one year of listing a species on Schedule 1 of SARA as endangered and within two years of listing a species as extirpated or threatened. A management plan must be prepared within three years for a species listed as special concern. Fisheries and Oceans Canada (DFO) is accountable for 111 of the 518 species listed under SARA. As of February 2016, proposed recovery strategies, management plans and action plans for 57 of those species have not yet been posted to the Species at Risk Public Registry. An additional 23 aquatic species have proposed management or action plans coming due in the future. The following outlines the Department’s plan for posting proposed documents for 64 species on the Species at Risk Public Registry. The Department has a plan to post recovery strategies for 9 species, management plans for 13 species, and action plans for 42 species over the next year. Original publication of the Recovery Document Posting Plan: 2016-05-02
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