. The Canadian field-naturalist. 172 The Canadian Field-Naturalist Vol. 101. Figure 1. Lake Sturgeon, Acipenserfulvescens. of the freshwater fisheries and in some areas ( Alberta) there are Hmited sport fisheries. The species was undoubtedly important to native peoples as a source of food before the coming of Europeans to the continent. Later, in the 19th century, it became an important commercial species. Distribution The Lake Sturgeon has one of the widest geographic ranges of any North American freshwater fish (Figure 2). Its range includes the three major watersheds: the Great Lakes, H
. The Canadian field-naturalist. 172 The Canadian Field-Naturalist Vol. 101. Figure 1. Lake Sturgeon, Acipenserfulvescens. of the freshwater fisheries and in some areas ( Alberta) there are Hmited sport fisheries. The species was undoubtedly important to native peoples as a source of food before the coming of Europeans to the continent. Later, in the 19th century, it became an important commercial species. Distribution The Lake Sturgeon has one of the widest geographic ranges of any North American freshwater fish (Figure 2). Its range includes the three major watersheds: the Great Lakes, Hudson-James Bay, and the Mississippi River. In the United States, the Lake Sturgeon appears to have been limited to the Mississippi drainage and its larger tributaries south to Nebraska, Missouri and Alabama (Harkness and Dymond 1961; MacKay 1963; Scott and Grossman 1973). In Ganada, the Lake Sturgeon has been reported from the large rivers draining into Hudson Bay (Figure 3; known areas of historic fisheries indicated by circles) as far north as the Seal River on the west coast and Fort George on the east coast (Harkness and Dymond 1961). In the prairie provinces it is found in Alberta in the North Saskatchewan River as far upstream as Edmonton and commonly in the South Saskatchewan River (Roberge, personal communica- tion); in Saskatchewan in the Saskatchewan, Ghurchill and Nelson rivers and in Gumberland Lake (Scott and Grossman 1973; Roberge, personal communication); and in Manitoba in lakes Winnipeg, Winnebago, Manitoba, Playgreen and Gross, and the Assiniboine and Red rivers (Scott and Grossman 1973; Roberge, personal communication). In Ontario, Lake Sturgeon have been reported from the Great Lakes basin and the drainage of Hudson Bay. They extend east in the St. Lawrence to St. Roch des Aulnaires, beyond which salinity levels are apparently too high forthe species (Harkness and Dymond 1961). In Quebec, Lake Sturgeon have been observed in most of the rivers of the James B
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