. The Canadian field-naturalist. 90 The Canadian Field-Naturalist Vol. 104. Figure 3. D'lstnhution oi Ictiobus cyprinellus in Camaia. The Assiniboine River Floodway which diverts floodwater from the river into Lake Manitoba near Delta Marsh was probably the avenue of dispersal used by a number of species (including Bigmouth Buffalo) recently reported from Lake Manitoba. The floodway was opened briefly in 1970 but the west dike, which allows excess water to flow directly into Delta Marsh, was not opened until 1974 (Stewart et al. 1985). Further substantiation is the recent report of Ictiobus cy
. The Canadian field-naturalist. 90 The Canadian Field-Naturalist Vol. 104. Figure 3. D'lstnhution oi Ictiobus cyprinellus in Camaia. The Assiniboine River Floodway which diverts floodwater from the river into Lake Manitoba near Delta Marsh was probably the avenue of dispersal used by a number of species (including Bigmouth Buffalo) recently reported from Lake Manitoba. The floodway was opened briefly in 1970 but the west dike, which allows excess water to flow directly into Delta Marsh, was not opened until 1974 (Stewart et al. 1985). Further substantiation is the recent report of Ictiobus cyprinellus from the Assiniboine River in Manitoba (Grossman and McAllister 1986). Bigmouth Buffalo may have originally dispersed into Manitoba from the Mississippi River via the Red River. Stewart et al. (1985) suggest that it entered the Red River after 2000 BP. Glacial Lake Agassiz was probably not involved in the dispersal as Bigmouth Buffalo likely invaded much later than the recession of the ice flows due to limiting water temperature ( Mandrak, personal communication). Lake Agassi/ is generally considered to have been formed earlier than other glacial waters (Radforth 1944) and Bigmouth Buffalo is a warm water species limited to the southern part of the Hudson Bay watershed. There are many species which occur in the Red River but not in the Souris River. Some have moved upstream into the English-Winnipeg system which possibly explains its occurrence in the Lake of the Woods. Others such as the Bigmouth Buffalo, have dispersed into the Assiniboine-Qu'Appelle system and become established (Grossman and McAllister 1986). In Saskatchewan, Bigmouth Buffalo are abundant in the eight larger lakes of the Qu'Appelle drainage system (Johnson 1963; Atton 1983). Extensive seining of the Frenchman, Souris, and Assinboine river drainages in Saskatchewan has failed to disclose its presence there. Despite its occurrence in the Milk River of Montana, part of the Missouri drainage, it a
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