. The Canadian field-naturalist. 1992 Campbell: Status of the Mountain Sucker 29. Figure 2. Approximate North American range of the Mountain Sucker, Catostomus platyrhynchus. Saskatchewan; upper Missouri River drainage, Montana and Wyoming, and the Black Hills, South Dakota; White River and formerly, possibly, the Niobrara River, Nebraska" (Smith 1966: 60-62). In Canada, the species has been reported from the South Saskatchewan River in Saskatchewan and Alberta; the Milk River drainage in the Cypress Hills region of Alberta and southwestern Saskatchewan; west in southern Alberta to the Fl
. The Canadian field-naturalist. 1992 Campbell: Status of the Mountain Sucker 29. Figure 2. Approximate North American range of the Mountain Sucker, Catostomus platyrhynchus. Saskatchewan; upper Missouri River drainage, Montana and Wyoming, and the Black Hills, South Dakota; White River and formerly, possibly, the Niobrara River, Nebraska" (Smith 1966: 60-62). In Canada, the species has been reported from the South Saskatchewan River in Saskatchewan and Alberta; the Milk River drainage in the Cypress Hills region of Alberta and southwestern Saskatchewan; west in southern Alberta to the Flathead River sys- tem in the Waterton Lakes Region; north along the foothills of the Rockies in streams of the Saskatchewan River System to the North Saskatchewan River (Figure 3) [Scott 1957; Reed 1959; Willock 1969; Scott and Crossman 1973; Atton and Merkowsky 1983]. In British Columbia, the Mountain Sucker has been reported from the Columbia River system, the Similkameen and Tulameen rivers, and Otter and Wolfe creeks; and from the North Thompson (Fraser) River system (Figure 3) [Carl et al. 1967; Scott and Crossman 1973]. Protection No specific measures are in place for the protec- tion of this species in Canada. General protection, if required, could be afforded through appropriate sec- tions of the Fisheries Act of 1867 (as amended to date). D. E. McAllister (Canadian Museum of Nature, Ottawa, Ontario: personal communication) and Scott and Crossman (1973) indicate that the species may be a rare member of the Canadian fauna. The Mountain Sucker was listed as a species of special concern in the State of Washington by (Johnson 1987), but not by Williams et al. (1989). Population Sizes and Trends Information on this species is mostly limited to presence and absence data. The Mountain Sucker was virtually unknown in Canada prior to 1947 when Dymond (1947) recorded the species from the Cypress Hills Region of southwestern Saskatchewan. There is a previous mention by Eigenmann (
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