Species Profile

Hickorynut

Scientific Name: Obovaria olivaria
Taxonomy Group: Molluscs
COSEWIC Range: Ontario, Quebec
COSEWIC Assessment Date and Status Change: May 2011
COSEWIC Status: Endangered
COSEWIC Status Criteria: A2c+4c
COSEWIC Reason for Designation:

This freshwater mussel lives in mid-sized to large rivers in southern Ontario and Quebec. There has been an historical decline in the species’ distribution with losses of the populations in the Detroit and Niagara rivers. Other locations are threatened by the continuing invasion of dreissenid mussels. In addition, the one known host of this mussel, the Lake Sturgeon, is at risk and may be declining in some locations where the mussel is known to still occur. The species is also affected by degraded water quality in many freshwater systems in southern Ontario and Quebec.
COSEWIC History of Status Designation: Designated Endangered in May 2011.
SARA Status: Schedule 1, Endangered
Date of Listing (yyyy-mm-dd): 2019-08-08

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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Hickorynut Photo 1

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Description

The Hickorynut is one of Canada’s 54 freshwater mussel species and one of only two mussels in the genus Obovaria found in Canada. Also known as the Olive Hickorynut, this small-to-medium sized mussel is easily recognized by the following features: Nearly oval-shaped shell, no longer than 7.5 centimeters; shell colour is green to yellowish-brown, turning dark brown with age; thin, greenish coloured rays can often be seen on juvenile shells; inside of shell (nacre) is usually bright white and often iridescent towards the back (posterior); shell is thicker in the front (anterior) and thinner at the back (posterior); posterior of the shell is broadly pointed in males and rounded in females; beaks are elevated, raised above the hinge line and set towards the extreme anterior of the shell; and hinge teeth are complete, thick and well defined.

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Distribution and Population

Historically, the Hickorynut was widely distributed along the large river bottoms of the Mississippi River drainage system and the Great Lakes-St. Lawrence basin. While still broadly distributed in the Mississippi drainage of the United States, the Hickorynut is imperiled or lost from most of the American Great Lakes states. In Canada, current populations are now only found in certain rivers and their tributaries within the Great Lakes-St. Lawrence drainage system, from Lake Huron in southern Ontario to Quebec City in the east. Rivers include the Mississagi River, Ottawa River, St. Lawrence River and the Saint Francois River.

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Habitat

Hickorynut are typically found in the sandy bottoms (substrates) of large, wide and deep rivers (2–3 metres or deeper) with moderate to strong currents.

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Biology

Hickorynut are fairly long-lived mussels, with a lifespan between 7 and 14 years. The Hickorynut is considered a long-term brooder; spawning happens in the fall and the larvae (glochidia) are released the following summer. Like most other freshwater mussels, Hickorynut glochidia are parasitic on fishes—the glochidia attach to and feed off the gills of a host fish until they reach their juvenile, free-living stage and drop off to burrow in the substrate below. Adult Hickorynut are essentially sessile and may move only a few meters along the substrate the entire rest of their lives. Like all species of freshwater mussels, they filter food from the water. Bacteria and algae are its primary food sources.

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Threats

The introduction of Zebra and Quagga mussels in the 1980s and 90s wiped out the Hickorynut in the Detroit and upper St. Lawrence rivers. The invasive mussels attach to Hickorynut shells by the hundreds, preventing them from eating, breathing, moving and reproducing, and continue to threaten the remaining Hickorynut populations. Dams along the large river habitats of the Hickorynut are another serious threat, as its suspected host fish, the Lake Sturgeon, are unable to traverse them. With fewer hosts, the chances of enough larvae reaching their free-living stage to maintain the population are greatly reduced. Pollution from industry and agriculture also threaten the Hickorynut and its host by decreasing the water quality of the habitat.

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Protection

Federal Protection

The 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.

In Canada, this species is currently under consideration for listing as Endangered under the federal Species at Risk Act (SARA). More information about SARA, including how it protects individual species, is available online at AquaticSpeciesAtRisk.ca or on the SARA Registry at SaraRegistry.gc.ca.

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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Other Protection or Status

The Hickorynut is listed as Endangered under Ontario’s Endangered Species Act, 2007, and is anticipated for listing under Quebec’s Act respecting Threatened or Vulnerable Species. If listed under the SARA, a recovery strategy and action plan will be developed to prevent the loss of the Hickorynut in Canada, involving research, land and water stewardship, monitoring and awareness activities. Critical habitat for the Hickorynut will also be identified under the SARA, allowing for greater protection and recovery of its habitat.

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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.

27 record(s) found.

COSEWIC Status Reports

  • COSEWIC Assessment and Status Report on the Hickorynut Obovaria olivaria in Canada (2011-09-09)

    The Hickorynut (also known as the Olive Hickorynut, Obovaria olivaria) is a freshwater mussel in the family Unionidae. The shell of this medium-sized mussel is usually less than 75 mm long. This species is easily distinguished from other mussels in Canada and can be recognized primarily from its relatively small and nearly oval shell, its unique hinge features and the far anteriorly located peak of the shell.

Response Statements

  • Response Statement - Hickorynut (2011-12-08)

    This freshwater mussel lives in mid-sized to large rivers in southern Ontario and Quebec. There has been an historical decline in the species’ distribution with losses of the populations in the Detroit and Niagara rivers. Other locations are threatened by the continuing invasion of dreissenid mussels. In addition, the one known host of this mussel, the Lake Sturgeon, is at risk and may be declining in some locations where the mussel is known to still occur. The species is also affected by degraded water quality in many freshwater systems in southern Ontario and Quebec.

Action Plans

  • Multi-species Action Plan for La Mauricie National Park and National Historic Sites of La Mauricie and Western Quebec regions (2020-10-06)

    The Multi-species Action Plan for La Mauricie National Park and Canada's national historic sites (NHS) that are part of the Mauricie and Western Quebec Field Unit (MWQFU) applies to the land and waters within the boundaries of La Mauricie National Park (LMNP) and 13 NHSs in Quebec: Obadjiwan–Fort Témiscamingue; Forges-du-Saint-Maurice; Fort Chambly; Fort Lennox; Battle of the Châteauguay; Coteau-du-Lac; Carillon Barracks; Manoir Papineau; Louis-Joseph Papineau; Louis S. St-Laurent; Fur Trade at Lachine National Historic Site; Sir Wilfrid Laurier; and Sir George-Étienne Cartier. This plan meets the requirements for action plans set out in the Species at Risk Act (SARA; section 47) for species requiring an action plan that regularly occur on these sites. Measures described in this plan will also provide benefits for other species of conservation concern that regularly occur in LMNP and on associated NHSs.

Orders

  • Order Amending Schedule 1 to the Species at Risk Act (Volume 153, Number 17, 2019) (2019-08-21)

    Biodiversity is rapidly declining at all scales, from local to global, as a result of a variety of human activities that increase the rates of species extinction. Current extinction rates are estimated to be between 1 000 and 10 000 times higher than the natural background rate. Higher species diversity positively supports healthy and productive ecosystems that are more resilient to disturbances, and, given the interdependency of species, a loss of biodiversity can lead to a declining resilience of ecosystem functions and services (e.g. natural processes such as pest control, pollination, coastal wave attenuation, pharmaceutical products, temperature regulation and carbon fixing). These services are vital to the health of all Canadians and are important for Canada’s economic well-being. Biodiversity loss can therefore result in adverse, irreversible and broad-ranging effects on Canadians.

COSEWIC Annual Reports

  • COSEWIC Annual Report - 2010 - 2011 (2011-09-09)

    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 during the past year assessing the status or reviewing the classification of a total of 92 wildlife species.

Permits and Related Agreements

  • Explanation for issuing permit(#19-HCAA-01050 ), persuant to the provisions of section 73 of SARA (2019-08-30)

    The activity authorized by the permit that may cause incidental harm to Hickorynut (Obovaria olivaria), a contravention of section 32(1) of the Species at Risk Act, is the capture and relocation of Hickorynut within the prescribed search area (which includes two Activity zones, 350 m2 and 300 m2 and a 3 m buffer) within the Blanche River. These works are to be completed in 2019 and 2021 prior to two phases of in-water construction for a bridge replacement project (18-HCAA-00429). This permit is limited to mussel capture and relocation. Future in-water construction works may occur in this section of the Blanche River. The mussel relocation will be occurring prior to the construction to ensure that mussels are relocated when water temperatures are above or close to 16°C.
  • Explanation for issuing permit(#19-HCAA-01835 ), persuant to the provisions of section 73 of SARA (2020-06-05)

    Mussel salvage and relocation is required for the project of dredging of Britannia Beach in the Ottawa River. The activities associated with the proposed project that are likely to result in the incidental harm to Hickorynut (Obovaria olivaria) are the handling, salvage, and relocation of Hickorynut within the isolated area of the turbidity curtain. The works will require the salvage and relocation of Hickorynut from suitable habitats impacted by construction activities within a search area of 14 026 m2. This may result in the incidental harm or harassment of Hickorynut, a listed aquatic species at risk, resulting from its capture, processing, and relocation.
  • Explanation for issuing permit(#19-PCAA-00026 ), persuant to the provisions of section 73 of SARA (2019-08-21)

    The objectives of the activities covered by the permit include: 1. To conduct quantitative and semi-quantitative surveys for species at risk mussels at sites within locations across southern Ontario (Detroit, Grand, Ottawa, Sydenham, Thames, St. Lawrence River watersheds, Lake St. Clair tributaries, Walpole Island First Nations/St. Clair River delta) to track changes in species and habitat over time, and evaluate recovery efforts; 2. Depending on species detected during qualitative and semi-quantitative sampling, to obtain genetic samples for further analyses; 3. To conduct a morphometric analyses on animals collected during quantitative and/or semi-quantitative sampling; 4. Depending on species detected during qualitative and semi-quantitative sampling, to evaluate reproductive condition of animals found; and, 5. 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 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 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, obtaining genetic samples, etc.). All mussels will be returned alive to the locations they were found; and, 3. The possession and transport of any of the species listed on the permit killed incidentally.
  • Explanation for issuing permit(#19-PCAA-00027 ), persuant to the provisions of section 73 of SARA (2019-08-21)

    The objective of the activities covered by the permit are to conduct fish and mussel surveys in the St. Clair River watershed and the Lake St. Clair watershed. Baseline data collected will be used to assist in future project proposals and inquiries. Species at risk listed on the permit may be captured during surveys. The activities authorized by the permit consist of: 1. The capture of any of the species listed on the permit from the watersheds listed on the permit. 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); 2. The handling of any of the species listed on the permit for the purposes of identification and processing. Fishes will be identified, counted, and 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; and, 3. The possession and transport of any species listed on the permit killed incidentally or for vouchering purposes.
  • Explanation for issuing permit(#19-PCAA-00031 ), persuant to the provisions of section 73 of SARA (2019-08-21)

    The objectives of the activities covered by the permit include the study of: 1. Post-excystment juvenile Unionid mussel dispersion; 2. The effects of multiple stressors on Unionid mussel suspension feeding; 3. The effect of shear stress on juvenile Unionid settlement; 4. The association between flow velocity and shell orientations and morphometrics; and, 5. 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: 1. The incidental capture of species listed on the permit from the Grand, Sydenham, and Thames rivers. 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. Feeding Studies: Species will be collected via three possible methods: (1) "raccooning" and excavation; (2) manual sieving through the sediment; and, (3) visual searching (depending water clarity); 2. The handling of the species listed on the permit for the purposes of identification and processing (count, measure, marking, and photograph). Any juveniles found will be measured, photographed, returned to their original place along the transect, along with the sediment. All mussel species at risk, once identified, are 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; and, 3. The possession and transport of dead specimens of any of the species listed on the permit killed incidentally.
  • Explanation for issuing permit(#19-PCAA-00043 ), persuant to the provisions of section 73 of SARA (2019-08-21)

    The objective of the activities covered by the permit is 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. 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 Grand River. Surveys at randomly distributed sampling sites (50 sites total) will be done by towing a brail along multiple (4 to 5) transects. Tow length (50 or 100 m) will be set after pilot trials during the first week of sampling; 2. The handling of the species listed on the 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 the permit killed incidentally.
  • Explanation for issuing permit(#19-PCAA-00046 ), persuant to the provisions of section 73 of SARA (2019-08-21)

    The objective of the activities covered by the permit is 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(#19-PCAA-00061 ), persuant to the provisions of section 73 of SARA (2019-09-20)

    The objective of the activities covered by the permit is to further understand the preferred habitat requirements of Hickorynut (Obovaria olivaria) in the Ottawa River watershed and to describe the community of freshwater mussel species found co-existing with Hickorynut. The activities authorized by this permit consist of 1. The capture of Hickorynut via the use of divers (snorkelling and SCUBA) within the Ottawa River watershed. Hickorynut density will be determined by excavating 1 x 1 m quadrats. Mussels will be returned to the location of capture after processing; 2. The handling of Hickorynut for the purposes of identification and processing (count, measures, and photograph). Digital vouchers will be taken of any mussels captured. All mussels will be returned alive to the location of capture with the exception of two specimens from each major site visited, which will be retained for DNA, morphological, and glochidia studies. Specimens will only be retained if the population is deemed large enough to support the loss, and no more than 40 specimens in total shall be retained; and, 3. The possession and transport of a maximum of 40 Hickorynut over the valid permit period, killed incidentally or for research purposes.
  • Explanation for issuing permit(#20-HQUE-00206 ), persuant to the provisions of section 73 of SARA (2020-08-01)

    Conducting inventories to characterize fish habitat, including substrate sampling, which could be done with grabs if visibility conditions preclude the use of cameras. Work will take place in an area where the presence of the Hickorynut has already been confirmed and could therefore involve the handling of some individuals if their presence is observed in the samples taken. As applicable, authorized activities will consist of identifying and counting all live captured mussels as well as of measuring and relocating Hickorynuts.
  • Explanation for issuing permit(#20-HQUE-00222 ), persuant to the provisions of section 73 of SARA (2020-08-01)

    Conducting a diving survey of mussels as part of the impact assessment for the Île-aux-Tourtes Bridge reconstruction project. The authorized activity will consist in manually collecting mussels and bringing them up to the surface for identification. For transects located outside the area that could be affected by the bridge reconstruction project, mussels will be released directly at the capture site. For transects located inside this area, captured Hickorynuts will need to be relocated outside of it.
  • Explanation for issuing permit(#20-HQUE-00235 ), persuant to the provisions of section 73 of SARA (2020-08-24)

    Conducting a freshwater mussel survey as part of the Honoré-Mercier Bridge reconstruction project. The surveys will be done in shallow water using an underwater camera, waterscope and active searches. If necessary, mussels will be harvested manually and brought to the surface to be identified. The work will be done in an area where Hickorynuts are potentially present and therefore could involve the handling of a few individuals of that species, if their presence is observed in the samples taken. If any are found, the authorized activity will consist in identifying and counting all live freshwater mussels captured and measuring and relocating Hickorynuts when required.
  • 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-00036 ), persuant to the provisions of section 73 of SARA (2020-07-23)

    The objectives of the activities covered by the permit are to conduct fish community surveys in the lower Thames River and its tributaries, within the jurisdiction of the Lower Thames River Conservation Authority, in Ontario. The species listed on the permit may be captured incidentally during this work. The activities authorized by the permit consist of: 1. The capture of the species listed on the permit via seining (fishes) and quadrat/visual surveys (mussels), from the lower Thames River watershed; 2. The handling of the species listed on the permit for the purposes of identification (count, measure, and photograph). With the exception of vouchers that may be retained to confirm identification, all fishes will be released alive after processing. Any mussels captured will be released alive at the location of capture; and, 3. The possession and transport of the species listed on this permit killed incidentally as a result of sampling and/or processing or for vouchering purposes (fishes only).
  • Explanation for issuing permit(#20-PCAA-00038 ), persuant to the provisions of section 73 of SARA (2020-08-24)

    The objectives of the activities covered by this permit are to search the shore of the Ottawa River and the lower ends of its tributaries between Ottawa and Notre-Dame-du-Nord, Ontario and Quebec, for empty mussel valves (both recently deceased and old), including Hickorynut (Obovaria olivaria) valves. The activities authorized by this permit consist of: 1. The collection of empty Hickorynut valves from the Ottawa River and its tributaries; and, 2. The possession and transport of empty Hickorynut valves. Habitat disruption as a result of sampling methods will result in a short-lived localized habitat disturbance that is minimal in nature. No harm to species at risk resulting from these activities is expected.
  • Explanation for issuing permit(#21-PCAA-00022 ), persuant to the provisions of section 73 of SARA (2021-05-05)

    The objectives of the activities covered by the permit include: 1. Conducting fish and mussel community surveys within locations in the lower Thames River watershed (from Delaware, ON, to the mouth), lower Thames River tributaries, Rondeau Bay and tributaries, McGeachy Pond, Lake Erie tributaries (between Two Creeks and Talbot Creek), and Lake St. Clair tributaries (between the mouth of the Thames River to Boyle Drain); and, 2. To conduct targeted seining surveys for Eastern Sand Darter (Ammocrypta pellucida) (Ontario populations) within the Thames River. The 19 species at risk (SAR) listed on the permit may be captured incidentally during this work. The activities authorized by the permit consist of: 1. The capture of the species listed on this permit via seining (fishes) and quadrat or visual surveys (mussels), from the locations listed previously; 2. The handling of the species listed on the permit for the purposes of identification (count, measure, and photograph). With the exception of vouchers that may be retained to confirm identification, all fishes will be released alive after processing. Any mussels captured will be released alive at the location of capture; and, 3. The possession and transport of the species listed on the permit killed incidentally as a result of sampling and/or processing, or for vouchering purposes.
  • Explanation for issuing permit(#21-PCAA-00023 ), persuant to the provisions of section 73 of SARA (2021-05-05)

    The objectives of the activities covered by the permit are: 1. To conduct quantitative and semi-quantitative surveys in the St. Clair River and tributaries, the Sydenham, Thames, and Grand rivers, and lakes Huron, Erie, and Ontario, for species at risk (SAR) mussels (Fawnsfoot [Truncilla donaciformis], Hickorynut [Obovaria olivaria], Kidneyshell [Ptychobranchus fasciolaris], Lilliput [Toxolasma parvum], Northern Riffleshell [Epioblasma rangiana], Rayed Bean [Villosa fabalis], Round Pigtoe [Pleurobema sintoxia], Round Hickorynut [Obovaria subrotunda], Salamander Mussel [Simpsonaias ambigua], Snuffbox [Epioblasma triquetra], and Threehorn Wartyback [Obliquaria reflexa]), to track changes in species and habitat over time, and evaluate recovery efforts. Drift samples may be taken at a subset of sites to evaluate the timing of glochidial release; 2. To hold a mussel identification workshop in late June over a two-day period. The second day of will be spent at a site on the Sydenham River where attendees will practice field identification skills under the 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; and, 5. To tag some individuals when necessary for future identification. The aforementioned species may be captured during this work. The activities authorized by the permit consist of: 1. The capture of all mussel species listed previously, via quadrat sampling or timed searches, from the locations listed previously. 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 to species and measured; 2. The handling of SAR 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 previously killed incidentally or for vouchering purposes.
  • Explanation for issuing permit(#MPO-LEP-19-022), persuant to the provisions of section 73 of SARA (2019-09-17)

    A maximum of five (5) days of Hickorynut inventories encompassing fifteen (15) stations at the mouth of the Saint-Maurice River and in the St. Lawrence River (area between Trois-Rivières and Sainte-Anne-de-la-Pérade). The inventories will be conducted on foot, using a small boat, by snorkelling or SCUBA diving, using aquascopes, rakes, nets or tongs. The work involves handling, measurement, counting, taking photos, and habitat characterization. The inventories also include harvesting empty Hickorynut shells for the conservation and analysis of mother-of-pearl, making various measurements, analyzing signs of predation or aquatic invasive species (zebra mussel/quagga). The objectives of this project are to confirm the presence/absence of Hickorynut in an area where its presence has not been confirmed and to characterize habitat where these mussels are present and habitat where they are absent, by characterizing the habitat types inventoried.
  • >> See more Permits and Related Agreements documents

Consultation Documents

  • Hickorynut - Consultations on listing under the Species at Risk Act (2014-04-09)

    The Species at Risk Act acknowledges that all Canadians have a role to play in preventing the disappearance of wildlife species. Before deciding whether any of these Hickorynut populations will be added to the List of Wildlife Species at Risk, we would like your opinion, comments and suggestions regarding the possible ecological, cultural and economic impacts of listing or not listing these populations under the Species at Risk Act.
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