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Becker, G.C. Buffaloes can be distinguished from most other suckers (Catostomidae) by their long, falcate dorsal fin (Page and Burr 1991). Synonymy. Galt House Publishing, Oakville ON. Many of the rivers in southern Ontario are highly turbid as a result of flowing over clay substrates and through highly agricultural lands. 1974. Scott, W.B. Manitoba Department of Mines and Natural Resources. Other Common Names. 2005. 1970. Synthesis report: identification of the physical and chemical attributes and aquatic species at risk of the Thames River watershed. The Smallmouth Buffalo (Ictiobus bubalus) is a freshwater Cypriniformes fish.Native to major tributaries and surrounding waters of the Mississippi River in the United States. 8 p. Schindler, D.W., and W.F. However, the opening of the Assiniboine River Floodway in 1974 (which diverts floodwater from the river into Lake Manitoba near Delta Marsh) permitted the dispersal of a number of species (including Bigmouth Buffalo) into Lake Manitoba. A total of 58 km of the river channel was deepened and 19 of 32 km of meanders were removed. Wild Species. Aquat. 1970. Females are fecund, bearing about 250,000 eggs/kg of body weight (Kleinholz 2000), although it may be more like 100,000/kg in northern fish (Johnson 1963). In Saskatchewan, Bigmouth Buffalo prefer water shallower than 5 m (Johnson 1963). 1959. It is a long-lived, stocky fish like its relatives the bigmouth buffalo (I. cyprinellus) and the black buffalo (I. niger), although the smallmouth buffalo's mouth is located ventrally like other Catostomidaespecies, while the bigmouth buf… Bigmouth Buffalo are not as impacted by turbidity as other freshwater fishes. Parasites of North American freshwater fishes. Spawning occurs in late April and May in Wisconsin (Becker 1983). Foods of buffalofishes, genus Ictiobus, in central Arizona reservoirs. 1957. The fishes of Missouri. Definition of the (DD) category revised in 2006. 2554: iv+86p. 1979. ), between the Canada–United States border and the south basin of Lake Winnipeg, into which it flows. Ictiobus cyprinellus. 2006. Lacustrine populations of Bigmouth Buffalo are found in habitats with 25–75% littoral areas and protected embayments during the summer months. United States Geological Survey (USGS) – Nonindigenous Aquatic Species (NAS) database, Gainesville, FL. 2004. 102 p. Hlasny, R.E. They prefer waters of low gradient and moderate to slow current, and do not penetrate waters of steep gradient. Smith. COSEWIC assessment and update status report on the Bigmouth Buffalo Ictiobus cyprinellus, Great Lakes – Upper St. Lawrence populations and Saskatchewan – Nelson River populations, in Canada. MS Rpt. and D.A. D. 24-32; A. Bigmouth Buffalo were reported from Lake of the Woods in 1973 and 1976 (Goodchild 1990), headwaters of the Winnipeg River that drains into the south basin of Lake Winnipeg. Due to soft organic substrates, extensive emergent macrophytes and water depths generally greater than 1m, seining can only be undertaken in very small portions of the ponds (H. Surette, University of Guelph, pers. The fishes of Illinois. Zoogoegraphy of freshwater fishes of the Hudson Bay drainage, Ungava Bay and Arctic Archipelago. 30 pp. The only voucher–confirmed specimens of Bigmouth Buffalo collected from the Canadian portion of the Lake Huron drainage were caught at the mouth of the Ausable River by boat electrofishing in 2003 and 2007 (CMN, unpubl. The genetic population structure of the Bigmouth Buffalo in Canada is unknown. 2005. 1967. Other characteristics from Trautman (1981) are: lateral lines scale of 35–43; dorsal fin ray count at 24–32; and subopercle broadest at its middle, with its posterior edge forming an even curve. Ictiobus, Greek, meaning “bull fish;” bubalus, Greek for “buffalo” (Pflieger 1997). MacKinnon and S.E. 10:25 . Williams. 1985), and from there, upstream into the English–Winnipeg system and/or the Assiniboine–Qu’Appelle system (Crossman and McAllister 1986). and E.J. Successful reproduction appears to be associated with spring waters levels, and is dependent on spring flooding to provide access to spawning areas, to activate spawning activity (Johnson 1963), and maintain shoreline vegetation (Moen 1974; Hlasny 2003). Hlasny (2003) also calculated that, based on a mean population estimate of 8700 fish, there would be 2865 fish, weighing 19,390 kg, within the size range of the commercial fishery. Although generally considered a ‘big–water’ fish, in the southern portion of the state of Wisconsin, they are occasionally found in streams only 6–12 m wide, and most frequently found in waters greater than 1.5 m in depth over substrates of mud, silt, sand, gravel, clay and rubble (Becker 1983). Irvin. Attempts were made to obtain Aboriginal Traditional Knowledge (ATK) on the species, but to date have not resulted in any information being brought forward for this species. Heidinger. Houghton Mifflin Company, Boston. Fish. Stewart, K.W., I.M. or sign up with email About this Discussion. 2004. Generation time (average age of parents in the population), Observed percent reduction or increase in total number of mature individuals over the last 45 years (3 generations), Projected or suspected percent reduction or increase in total number of mature individuals over the next 30 years (3 generations), Observed, estimated, inferred, or suspected percent reduction or increase in total number of mature individuals over any 30 year (3 generation) period, over a time period including both the past and the future. Cooper, E.L. 1983. Pond culture is profitable and Bigmouth Buffalo have been reared in ponds in the southern U.S. since the early 1900s. Species at Risk Act: COSEWIC assessments and status reports,, Great Lakes-Upper St. Lawrence Biogeographic Zone, Saskatchewan-Nelson River Biogeographic Zone, Figure 1: The Bigmouth Buffalo (Ictiobus cyprinellus), Figure 6: Commercial Catch of Bigmouth Buffalo Taken from Pasqua Lake Between 1950 and 1983, with the Available 2000 Catch in kg Shown, Figure 7: Age Distribution of Bigmouth Buffalo Caught in 2000 in Pasqua Lake, Saskatchewan, Table 1: Index of Area of Occupancy Calculated Using 2 km x 2 km Grids for the Saskatchewan-Nelson River Biogeographic Zone, Table 2: Saskatchewan-Nelson Sampling Effort, United States Geological Survey (USGS) – Nonindigenous Aquatic Species (NAS). American commercial fishermen depend on these fishes for their livelihoods. Locations are thus defined as occupied sites where dispersal between such sites is rare or impossible, and a single threatening event could rapidly affect all individuals (see Limiting Factors and Threats). Coker, G.A., C.B. In most areas, the maximum reported age for Bigmouth Buffalo has been less than 10 years; although the oldest previously reported Bigmouth Buffalo was 20 years, it is now known that they may live considerably longer. 176 pp. Seasonal variation in diet items consumed was apparent in a diet study of Bigmouth Buffalo in Oklahoma reservoirs, with cladoceran consumption peaking in early spring, while ostracod consumption peaked in the fall (Tafanelli et al. A comparison of growth rates in Pasqua Lake calculated from measurements of 1831 specimens caught in 1955/6 (Johnson 1963), and 1024 specimens caught in 2000 (Hlasny 2003), indicated that rates had not changed between the 1955/56 samples and those of 2000. Fish. 1999. 2004. Used under licence to DFO. 47. Are there extreme fluctuations in number of populations? As successful reproduction appears to be associated with flooding of shoreline vegetation, loss of spawning habitat associated with regulated water levels is a threat to Bigmouth Buffalo. Goodchild (1990) speculated that its gradual movement into Canadian waters might be the result of overall climatic warming. In contrast to smallmouth buffalo, bigmouth buffalo do not have an arched or ridge-like back. Buffalo Creek (2005), Second Creek (2003), Truro Creek (2002); M. Erickson, Manitoba Water Stewardship, pers. Here is a Buffalo. Bigmouth buffalo (left) have long filaments on their gills that strain food from the water and they feed primarily by filter feeding, similar to paddlefish. Watkinson. 574 p. Kleinholz, C.W. It is listed as special concern on the Species at Risk in Ontario List (OMNR 2005). Smallmouth buffalo (right) by contrast feed primarily on the bottom. Misc. Fishing the tiny torpedo for smallmouth bass.

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