36 pp. 2000. Some of these may block fish movement entirely or unidirectionally and it is unknown if there is any movement of fish between Saskatchewan and Manitoba. For queries involving invertebrates, contact Amy Benson. So tossing out a couple of handfuls of canned corn is a no-no in MN? Dramatic declines in the Qu’Appelle River basin appear to be related to changes in water management practices that have led to elimination and/or degradation of spawning habitat and subsequent reduction in reproductive potential. Playing next. 1970. 1950. Bigmouth Buffalo were introduced to western Lake Erie and Sandusky Bay around 1920 (Trautman 1981) by the federal government - however, they may have already occurred there. Additional fish will be tagged in the Red River downstream of the St. Andrews Lock and Dam to understand seasonal river versus lake use. (1991); Page and Burr (1991); Etnier and Starnes (1993). University of California Press, Berkeley, CA. Changes such as channelization, removal of meander loops, and setting of lake levels, may have negatively impacted Bigmouth Buffalo by eliminating/degrading spawning habitats through reduction of available inundated or submerged vegetation. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. #3-2. Andrews Lock and Dam). 1983. Fish and Wildlife Service, Department of the Interior, Washington, DC. e “Priority” reflects the degree to which the measure contributes directly to the recovery of the species or is an essential precursor to a measure that contributes to the recovery of the species. You will not receive a reply. Browse more videos. Walker P. G. 2010. Efforts are currently being made to mitigate these issues (see section 6). Breder, C.M. Outside of spawning periods, they are more likely to be found mid-water or near the bottom in the deeper sections of long runs or pools, and most likely to be found in waters >1.5 m in depth over substrates of mud, silt, sand, gravel, clay and rubble (Trautman 1981, Becker 1983). NatureServe Explorer: An online encyclopedia of life [web application]. Rinne, and S.E. Fishes of Pennsylvania. Journal of the Fisheries Research Board of Canada 20(6)1397-1429. comm.). A demersal fish living near the lake bottom, Bigmouth Buffalo Inhabits main channels, pools, and backwaters of small to large rivers as well as lakes and impoundments. Galt House Publications, Ltd. Oakville, Ontario, Canada. Accessed [12/2/2020]. to be included by SARA Responsible Agency. During high flow years (from water control management or annual precipitation) vegetated habitat may be flooded, providing spawning habitat for Bigmouth Buffalo, but waters may recede too quickly in some areas resulting in loss of rearing habitat, stranding of adult fish, or mortality of fish eggs or fry. New fish distribution records in Manitoba and the role of a man-made interconnection between two drainages as an avenue of dispersal. For queries involving fish, please contact Matthew Neilson. Waxworm. Management should be directed towards maintaining sufficient quality and quantity of habitats to support known populations. The Saskatchewan – Nelson River populations, as shown on the map, have been found in three disjunct areas: Lake of the Woods, Ontario; the Lower Assiniboine, Red, La Salle (identified with a green star) and Seine (identified with a black cross) rivers, Delta Marsh, southern Lake Manitoba, and southern Lake Winnipeg, Manitoba; and the Qu’Appelle River system, Saskatchewan. Management planning is intended to benefit species at risk and biodiversity in general. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information. This management plan was prepared by Melanie VanGerwen-Toyne (DFO), Pooi-Leng Wong (DFO), and Calum Bonnington (contractor). † Populations may not be currently present. Canadian range: The Bigmouth Buffalo are found in two biogeographic zones. Wildlife Technical Report 82-2: 1-16. Hubbs, C., R. J. Edwards, and G. P. Garrett. Fisheries and Oceans Canada would like to thank the following organizations for their support in the development of this management plan: Manitoba Sustainable Development, Saskatchewan Water Security Agency, Saskatchewan Ministry of Environment, and the University of Saskatchewan. Ottawa. 70 pp. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. Goodchild, C.D. The bigmouth buffalo is a large-bodied native fish. Willoughby. The Wildlife Act. Checklists of the fish fauna of the Laurentian Great Lakes and their connecting channels. The introduction in Big Lake, Wisconsin, is probably a result of a transplant associated with fish rescue operations from the Mississippi River in the 1930s (Becker 1983). Page, L. M., and B. M. Burr. Eye level with the tip of the upper jaw. In the Qu’Appelle River system, Saskatchewan, Bigmouth Buffalo have been observed spawning in Rankin, Valeport and Fairy Hill marshes, Pasqua Lake, and Buffalo Pound Lake. This is relevant throughout the province, but one example is to investigate the species range expansion into Lake Manitoba via the Portage Diversion. Reproductive behaviour of the Bigmouth Buffalo. Distribution of the Bigmouth Buffalo is shaded in pink. In the Seine and La Salle rivers (tributaries of the Red River) spring floods provide several kilometers of suitable spawning habitat for the Bigmouth Buffalo (Watkinson pers. ), as do some tributaries of the lower Assiniboine River (Long pers. Bigmouth Buffalo are also captured incidentally by recreational fishers (anglers or bow fishers); however, this harvest is thought to be low and poses a low threat to the species (Sereda pers. Johnson, J.N. Investigating the link between flow and fish habitat in the Qu’Appelle valley. Fisheries and Oceans Canada strongly encourages all Canadians to participate in the conservation of Bigmouth Buffalo through undertaking priority conservation measures outlined in this management plan. In Manitoba, spring floods provide several kilometers of suitable spawning habitat for the Bigmouth Buffalo in the Seine and La Salle rivers, tributaries of the Red River (Watkinson pers. Southwestern Naturalist 35(4): 403-410. It is being provided to meet the need for timely best science. 820 pp. Drought in the southern prairies is not uncommon and may become more common given the predicted changes in aquatic ecosystems associated with global climate change (Poff et al. Bigmouth Buffalo Great Lakes - Upper St. Lawrence populations. Studies of Bigmouth Buffalo in Saskatchewan have recorded fish typically measuring 25 to 50 cm in length and weighing between 2 to 5 kg, but some fish in excess of 80 cm and 15 kg (20+ years old) have been caught (Johnson 1963, Hlasny 2000, Sereda and Pollock pers. Wiley. Bigmouth Buffalo is one of a few Ictiobus species found in Canada. 2014). 2014. Fish and Wildlife Branch Saskatchewan Environment. Canadian Endangered Species Conservation Council. Texas Journal of Science, Supplement 43(4):1--56. Global status: In the United States, the Bigmouth Buffalo is listed as G5 (NatureServe 2017). Burr. An annotated checklist of freshwater fishes of Texas, with key to identification of species. American Fisheries Society, Bethesda, MD. Etnier, D. A., and W. C. Starnes. Freshwater Fishes of Canada. comm., Hlasny and Bryshun pers. and E.O. Chapter W-13.12 of the Statutes of Saskatchewan, 1998 (effective March 6, 2000, except s.87, effective April 1, 1999) as amended by the Statutes of Saskatchewan, 2000, c.51 and 65; 2006, c.11; and 2007, c.43. comm.). An acoustic telemetry study in the Lake Winnipeg Basin was initiated in 2016 and tagged 20 Bigmouth Buffalo in both the La Salle and Seine rivers. #I-1. Press, University Park, PA. 243 pp. In Saskatchewan, the Qu’Appelle River system contains a series of eight water control sturctures. #2-1. Threats to the Bigmouth Buffalo have been organized into the following categories: a Level of concern: signifies that managing the threat is of (high, medium or low) concern for the recovery of the species, consistent with the population and distribution objectives. Other As with smallmouth buffalo, some anglers consider bigmouth buffalo to be a rough fish. and D.E. Houghton Mifflin Company, Boston, MA. 1985). The fishes of Tennessee. Handbook of Freshwater Fishery Biology. Moyle, P. B. The population was designated special concern in April 2009. The distribution of Bigmouth Buffalo contains numerous water control structures (figure 3) which may block fish movement and result in habitat fragmentation. The goals of the signs are to mitigate potentially negative activites and aid in the conservation of Bigmouth Buffalo. COSEWIC (2009) reported that declines in Bigmouth Buffalo in the Qu’Appelle River basin appear to be related to changes in water management practices that led to elimination and/or degradation of spawning habitat. The Bigmouth Buffalo is one of five species in the genus Ictiobus, and one of 18 sucker species and one of two, possibly three, Ictiobus species found in Canada. *Important notice and disclaimer: DFO does not assume any responsibility for the quality of information, products or services listed in the Web sites provided above. The Bigmouth Buffalo (Saskatchewan-Nelson River populations) was designated as special concern by COSEWIC in 2009 (COSEWIC 2009) and was listed as special concern under the federal Species at Risk Act in 2011. Proposed conservation measures that will further our understanding of Bigmouth Buffalo biology and habitat needs, and take actions to mitigate threats to the population have been numbered and organized according to the following broad strategies: Table 3 identifies the conservation measures to be undertaken by Fisheries and Oceans Canada in collaboration with other organizations/jurisdictions to support the conservation of Bigmouth Buffalo. Poff, N.L., M.M. Figure 2. Cudmore, B., C.A. #I-2. The bigmouth buffalo fish, or Ictiobus cyprinellus, is one of 67 fish species found in Saskatchewan waters, but it is also one of the six fish species currently at risk of extirpation (gone from a once-populated area) in the province. Table 1. In Canada, this designated unit is found in three disjunct areas: the Lake of the Woods, Ontario; the Lower Assiniboine, Red, La Salle and Seine rivers, Delta Marsh, southern Lake Manitoba, and southern Lake Winnipeg, Manitoba; and the Qu’Appelle River system, Saskatchewan (COSEWIC 2009). This species is second in size among suckers to the bigmouth buffalo. • Bigmouth Buffalo can grow nearly a meter long and can weigh as much as a Labrador re-triever (36 kg). Donahue. comm.) 1970). It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. These fish have already moved considerable distances, with an average movement of >150 river km in four months. and E.J. Fishes of Alabama and the Mobile Basin. Mooney. Bigmouth Buffalo Fish are susceptible to anchor parasites which lead to secondary infections and can be harmful in poor water conditions. #2-4. This designated unit was assessed as Not-at-Risk by COSEWIC (2009). … Therefore, current management of the species is required. Committee on the Status of Endangered Wildlife in Canada. Atton, F.M. comm.). In Illinois, spawning was observed in a reservoir at depths of 0.5 to 0.75 m over a bottom of hard-packed clay and some gravel, with decomposing vegetation (Burr and Heidinger 1983). Details on the habitat use of adult Bigmouth Buffalo in the upper Qu’Appelle River system are limited. In Manitoba, more information on the distribution of Bigmouth Buffalo is needed to understand the full extent of this species. The bigmouth buffalo, a North American species of freshwater fish, can live for more than 100 years – that’s over 80 years longer than previously thought. Sereda and Pollock (2014) reported that in Buffalo Pound Lake (within the Qu’Appelle River system), when the water temperature reached 17-19oC the first YOY (sac fry 7 to 10 days post spawn) appeared on May 21 with all eggs hatched by May 24. Mathews, W. J., and F. R. Gelwick. Successful reproduction is dependent on spring flooding to provide access to spawning areas and to initiate spawning activity (Johnson 1963). Water management for fish and wildlife of the Qu’Appelle River System. Scale bar = 400 km. Will hybridize with smallmouth buffalo (Johnson and Minckley 1969). Jenkins, R. E., and N. M. Burkhead. It is characterized by a robust, deep and laterally compressed body (figure 1). As all Canadians are invited to join in supporting and implementing this management plan for the benefit of the Bigmouth Buffalo and Canadian society as a whole, table 4 identifies measures that would support the conservation of Bigmouth Buffalo that could be undertaken voluntarily by other jurisdictions, groups and individuals interested in participating in the conservation of this species. MacKinnon and S.E. Bigmouth Buffalo. This information is preliminary or provisional and is subject to revision. Missouri Department of Conservation. However, populations are dwindling in the northern range including parts of Minnesota, North Dakota and Canada where majority of individuals are more than 80 years old. Version 7.1. Individual fish were detected with an acoustic telemetry network. 86798).Feeds on cladocera and cyclopoid copepods supplemented with midge larvae (Ref. comm. Geographic Range Bigmouth buffalo (Ictiobus cyprinellus) are native to much of North America. 10294).Oviparous (Ref. A Field Guide to Freshwater Fishes. T.F.H. Government of Saskatchewan. Publications, Neptune City, New Jersey. A provincially administered list of Species at Risk in Saskatchewan lists Bigmouth Buffalo as S3 (Vulnerable/Rare to uncommon: moderate risk of extinction or extirpation) (Saskatchewan Conservation Data Centre 2017), and in Manitoba as S5 (widespread, abundant, and secure throughout the province) (Manitoba Conservation Data Centre 2016) (table 1). In the Missouri River, the species was observed spawning in water so shallow that their backs were exposed (Pfleiger 1975). Top. Further investigation to confirm additional spawning areas is important to determine applicable conservation measures needed to protect this population. University of Wisconsin Press, Madison, WI. comm.). The dark-gray shaded area within the USA and Canada represents the endemic range of Bigmouth Buffalo 5,62. University of Manitoba Press, Winnipeg MB. 281 pp. Management Plan for the Bigmouth Buffalo (Ictiobus cyprinellus) in Canada (Saskatchewan-Nelson River populations) (Proposed). Top. Increasing demands for water for agricultural purposes may also be limiting for other population components in this Biogeographic Zone. Kolton Jamel. Scientific Name: Ictiobus cyprinellus Other/Previous Names: Bigmouth Buffalo (Great Lakes - Western St. Lawrence populations) Taxonomy Group: Fishes COSEWIC Range: Ontario COSEWIC Assessment Date and Status Change: April 2008 COSEWIC Status: Not at Risk COSEWIC Status Criteria: COSEWIC Reason for Designation: Populations … #III-1. 1998. Nelson, P. 2003. The SEA concluded that this plan will have a positive effect on the environment and will not entail any significant adverse effects. In Manitoba, two water control structures exist in the Assiniboine River and one in the upper Red River. Crossman. Buffalo have large mouths and lack the fleshy lips common to other suckers. However, it is recognized that plans may also inadvertently lead to environmental effects beyond the intended benefits. Bigmouth Buffalo are found in lakes and medium– to large–sized rivers in slower waters. Spawning: Bigmouth Buffalo exhibit broadcast spawning in the spring, and may move long distances to find suitable habitat (Cooper 1983). The Nonindigenous Occurrences section of the NAS species profiles has a new structure. Development and installation of educational signs about Bigmouth Buffalo at sites important to the conservation of the species will help to inform and educate the public on the species. For additional copies contact: COSEWIC Secretariat c/o Canadian Wildlife Service Environment Canada Ottawa, ON K1A 0H3 Tel. Up to ~750,000 eggs per spawning female – eggs adhere to vegetation. Draft. Habitats that were created benefited Walleye (Sanders vitreus) and Northern Pike (Esox lucius), two important recreational fish species (Dunn and Hjertaas 1981). The results of the SEA are incorporated directly into the plan itself, but are also summarized below. 2006. The Portage la Prairie Water Control Structure blocks upstream fish movement, but there is potential for fish to move downstream through the Portage Diversion channel and, in high flows, over the Assiniboine River control structure at Portage la Prairie. However, although regular fisheries assessments have occurred in Ontario waters, no Bigmouth Buffalo have been reported from the Lake of the Woods since 1976 (Dextrase IN COSEWIC 2009). 48 pp. Sereda, J. and M.S. comm.). Brinson, and J.W. Species at Risk Act Management Plan Series. This management plan will contribute to the FSDS goal and key priority (healthy wildlife populations) that ensures all species have healthy and viable populations. The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. Distribution of the Buffalo Fish Each of the five species has its own unique distribution and range. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables. 1991. Arizona Fish and Game Department. They have a coppery sheen. Journal of Great Lakes Research 38 (Supplement 3):115-122. COSEWIC status history: The species was considered a single unit and designated special concern in April 1989. Johnson, R.P. Occurs from Lake Erie south through Ohio and Mississippi River basins to the Tennessee River in northern Alabama, west to Arkansas, south to near the Gulf of Mexico in Louisiana, northwest through eastern Texas and Oklahoma (rare), north through Iowa and South Dakota to the Milk River in central Montana. Medium priority measures may have a less immediate or less direct influence on reaching the recovery population and distribution objectives, but are still important for recovery of the population. For instance, some information is available for certain areas such as Pasqua Lake (Hlasny 2000), but the summer, fall and winter staging sites of adults in the other areas are largely unknown. Conservation of Bigmouth Buffalo will be dependent on this overall collaborative approach, in which Fisheries and Oceans Canada is a partner in conservation efforts. viI + 40 pp. Work under this goal will support progress towards the 2020 Biodiversity Goals and Targets for Canada and the global conservation objectives of the United Nations Convention on Biological Diversity – in particular, by ensuring that needed management plans are in place. Foods of buffalofishes, genus. However, recent analysis has indicated that water management practices have resulted in periodic increased flow down the Qu’Appelle valley, potentially creating more areas with inundated or submergent vegetation (Sereda et al. Osprey. and K.F. To measure the progress toward meeting the long term objectives of this management plan, the following performance indicators have been identified: Detailed reporting on implementation of this management plan under s.72 of SARA will be done by assessing progress towards implementing the broad strategies and conservation measures. Water Security Agency. Dams on the rivers are represented by a vertical bar (l) and identified as follows: A=Qu’Appelle dam, B=Eyebrow dam, C=Buffalo Pound dam, D=Craven dam, E=Echo dam, F=Katepwa dam, G=Crooked dam, H=Round dam, I=Brandon rock ramp, and J=Portage Diversion River Control Structure, K=St. However, low level passage would likely result in fish mortality due to high turbulence and contact with the energy dissipating device immediately below the control structure. Rough fish - species considered undesirable as food/sport, Government of Manitoba Stop Zebra Mussels. The comment period has closed. #2-3. Hubbs, C.L. Burr, B.M. 1983. So tossing out a couple of . comm. Wrubleski, and B.G. Lagler. Mettee, M. F., P. E. O'Neil, and J. M. Pierson. #2-2. Regina: 83-2. Unlike other suckers, this species eats plankton as well as benthos, feeding primarily on cladocera and cyclopoid copepods supplemented with midge larvae (Etnier and Starnes, 1993). In the Red River, YOY appeared in early to mid-July (Stewart and Watkinson 2004). Range map credit: COSEWIC. 276 pp. Fishes of Arizona. 1963. Rankin, Valeport and Fairy Hill marshes, and other areas in the Qu’Appelle River system contain spawning sites for the Bigmouth Buffalo. Recommended citation: Fisheries and Oceans Canada. It is the largest member of the sucker family, growing to over 70 lb. 2002; Schindler and Donahue 2006). The Bigmouth Buffalo has a more terminal mouth, (that is, opening at the front of the head), which allows it to feed on plankton as well as bottom organisms and detritus. Low priority recovery measures will likely have an indirect or gradual influence on reaching the recovery objectives, but are considered important contributions to the knowledge base and/or public involvement and acceptance of species. Sereda, J., G. McMaster, and M.S. The back and sides of the smallmouth buffalo are light brown or otherwise dark with a coppery or greenish tint. It is important to locate these areas where adults spend the majority of their time outside the spawning window so potential threats may be identified and mitigated. Bigmouth Buffalo, Ictiobus cyprinellus in Canada, prepared under contract with Environment Canada, overseen and edited by Robert Campbell and Eric Taylor, Co-chairs, COSEWIC Freshwater Fishes Specialist Subcommittee. 432 pp. 1991. Long dorsal fin like other suckers but has a large oblique terminal mouth with thin sucker lips. Common Carp use Delta Marsh to spawn and are believed to be responsible for reduction of submerged aquatic vegetation in the wetland; habitat required for successful Bigmouth Buffalo spawning. Off-channel habitat with moderate to slow current such as side-channels, oxbows, sloughs, bayous or shallow lakes are preferred (Johnson 1963, Trautman 1981, Becker 1983). Stewart, K.W. Saskatchewan Wild Species at Risk Regulations of the province’s The Wildlife Act (Government of Saskatchewan 1998), Globally secure and subspecies/varieties unranked (G5TNR), Commerical fishery (rough fish or bycatch), Survey areas of Manitoba to better understand the estimated extent of occupancy of the Bigmouth Buffalo and document species biological information, Determine Bigmouth Buffalo distribution, movement, and habitat preference in Lake Winnipeg drainage, Manitoba via acoustic telemetry, Determine species distribution, movement and habitat requirements, Determine potential movement of Bigmouth Buffalo between the Qu’Appelle River in Saskatchewan and the Assiniboine River in Manitoba via acoustic and/or radio telemetry, Determine species distribution and movement, Manitoba Sustainable Development, University of Saskatchewan, Identify additional spawning areas for Bigmouth Buffalo in Manitoba and Saskatchewan, Ducks Unlimited, Manitoba Sustainable Development, Saskatchewan Water Security Agency, Saskatchewan Ministry of Environment, University of Saskatchewan, Investigate the impacts of Common Carp on the spawning habitat (submersed aquatic vegetation) of Bigmouth Buffalo in Delta Marsh, Manitoba, Ducks Unlimited, Manitoba Sustainable Development, Develop educational signs about Bigmouth Buffalo and install in strategic locations in Manitoba and Saskatchewan, Increase public awareness and stewardship, Manitoba Sustainable Development, Saskatchewan Water Security Agency, Saskatchewan Ministry of Environment, University of Saskatchewan, Identify summer, fall and winter distribution and habitat use for adult Bigmouth Buffalo in the upper Qu’Appelle River, Saskatchewan, Determine species distribution and habitat requirements, Determine age demographics of spawning Bigmouth Buffalo in the Qu’Appelle River system, Saskatchewan, Improve knowledge of species biology and population characteristics, Presentations to interested parties (cabin owners, land owners, Indigenous groups, resource users) on how they can participate in the conservation of the Bigmouth Buffalo, Environmental non-governmental organizations, Presentation to rough fish fishers on the Bigmouth Buffalo as a bycatch in Manitoba, Breach dykes at Last Mountain Lake to allow Bigmouth Buffalo access to additional wetlands/ spawning habitats, improve our knowledge of the species’ biology and population characteristics, determine species distribution, movement, and habitat requirements, increase public awareness and stewardship, identify and mitigate threats to the species, assess the distribution of Bigmouth Buffalo in Manitoba and document species biological information, study the Bigmouth Buffalo population in the Lake Winnipeg drainage, Manitoba to increase understanding of its distribution, movements, and habitat use, determine if there is mixing of Bigmouth Buffalo populations in the lower Qu’Appelle River, Saskatchewan and the Assiniboine River, Manitoba, identify additional spawning areas for Bigmouth Buffalo in Manitoba and Saskatchewan, investigate the impact of the Common Carp (, determine summer, fall, and winter distribution and habitat use of adults in the upper Qu’Appelle River system, Saskatchewan, analyze the age demographics of spawning Bigmouth Buffalo in the Qu’Appelle River system, Saskatchewan, develop educational signs about Bigmouth Buffalo and install in strategic locations in Manitoba and Saskatchewan, present information to interested parties in Manitoba and Saskatchewan on how they can participate in the conservation of the Bigmouth Buffalo, breach dykes at Last Mountain Lake, Saskatchewan to allow Bigmouth Buffalo access to additional wetlands/spawning areas, Threat category I: habitat loss/access/fragmentation, Broad strategy 4: management, coordination and threat mitigation, knowledge of the species biology and population characteristics have improved to facilitate management of the species and achieve the population and distribution objectives, sufficient quality and quantity of habitat have been secured to maintain existing population levels and distribution, some threats to the populations have been identified and mitigated. Range and habitat In North America, the bigmouth buffalo ranges from Montana east through the Great Lakes states and from Saskatchewan south through Louisiana. Sims Printing Company, Inc., Phoenix, AZ. Global distribution of Bigmouth Buffalo. comm. They are tolerant of low levels of dissolved oxygen (Gould and Irvin 1962), and readily adapt to new conditions such as reservoirs and ponds (Goodchild 1990). It is usually found in schools near the middle of the water column as well as along the bottom of medium- to large-sized rivers of low gradient and moderate to slow current. Communication in the form of presentations and factsheets on this subject could help mitigate impacts on Bigmouth Buffalo in the province. Where the three species coexist the Smallmouth Buffalo and Black Buffalo are observed to prefer deeper water and the Smallmouth Buffalo exhibits a preference for fine substrates (Becker 1983). Canadian Manuscript Report of Fisheries and Aquatic Sciences. Assessment of the Bigmouth Buffalo population in Pasqua Lake. and R.C. iv + 21 pp. Inhabits main channels, pools, backwaters of small to large rivers, lakes, and impoundments (Ref. #4-1. You can find most species in the United States, but they also range north into Canada and south into Mexico and Guatemala. 1996). and northern water milfoil (Myriophyllum sibiricum) (Sereda et al. The fishes of Missouri. Development of best management practices for the protection of Bigmouth Buffalo habitat in the Qu’Appelle River system. Bigmouth Buffalo are currently facing potential resource competition (food and habitat) from Common Carp (Pollock pers. Canadian occurrence: Saskatchewan, Manitoba. c Causal certainty: reflects the degree of evidence that is known for the threat (High: available evidence strongly links the threat to stresses on population viability; Medium: there is a correlation between the threat and population viability for example, expert opinion; Low: the threat is assumed or plausible). Edwards, E.A. Egalement disponible en français sous le titre : Plan de gestion du buffalo à grande bouche (Ictiobus cyprinellus) au Canada (populations des rivières Saskatchewan et Nelson) (proposition). Johnson (1963) reported that in Saskatchewan, Bigmouth Buffalo prefer water shallower than 5 m. Limiting factors: Natural factors that may limit the distribution of the Bigmouth Buffalo include hybridization, heavy parasitic infestations, and drought. Understanding the age demographics of spawning adults would allow a better understanding of recruitment. 1975. b Severity: reflects the population-level effect (High: very large population-level effect, Moderate, Low, Unknown). Split into two populations in April 2008 to allow a separate designation of the Bigmouth Buffalo (Great Lakes - Upper St. Lawrence populations). Heavy parasitic infestations, particularly by Myxosporidian spores, may debilitate populations due to interference with feeding mechanisms (COSEWIC 2009). Report FWS/OBS- 82/10.34 September 1983. Wild Species 2005: The General Status of Species in Canada.