. The Canadian field-naturalist. 60 The Canadian Field-Naturalist Vol. 104. lOmm Figure L River Darter, Percina shumardi {adapted from Cross 1967). north as Sipiwesk Lake and as far west as Lake Dauphin and the Red River (Scott and Grossman 1973). Protection River Darters are legally protected in the State of Ohio but not elsewhere in the United States, although the species is given special concern in Kansas, Kentucky, North Dakota, and West Virginia (Johnson 1987). In Canada, Percina shumardi have no specific protection, but incidental protection is provided by the Fish Habitat Section of the
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. The Canadian field-naturalist. 60 The Canadian Field-Naturalist Vol. 104. lOmm Figure L River Darter, Percina shumardi {adapted from Cross 1967). north as Sipiwesk Lake and as far west as Lake Dauphin and the Red River (Scott and Grossman 1973). Protection River Darters are legally protected in the State of Ohio but not elsewhere in the United States, although the species is given special concern in Kansas, Kentucky, North Dakota, and West Virginia (Johnson 1987). In Canada, Percina shumardi have no specific protection, but incidental protection is provided by the Fish Habitat Section of the Fisheries Act. Population Sizes and Trends Percina shumardi does not seem to have ever been abundant in Canadian waters (Scott and Crossman 1973). Not many collections have been made in Canada (NMC, OMNR, ROM records), and usually only one or two fish have been taken from a site, the most in a single collection being 10 specimens. The fish's range includes some relatively remote areas of the country and the paucity of collection records may be a reflection of this. It may also be a result of difficulty encountered in sampling the species' favoured habitat, large rivers with fair to moderate currents and a rocky substrate. Most Ontario records of River Darters are from lakes in the northwest of the Province; only two Ontario records actually come from rivers (Vermilion Creek, ROM 07709; Sydenham River (east), OMNR 582). The latter, and the collection from St. Luke's Bay, may indicate a range expansion into Lake St. Clair and southern Ontario. Scott and Crossman (1973) had earlier suggested the possibility of a southwestern Ontario distribution based on records from the Detroit River. Actual numbers of River Darters in Canadian waters cannot be estimated. The species seems to be naturally rare in Ontario and Manitoba, although they may exist undetected in many rivers. Records, although few and far between, seem to indicate stable populations in both provinces. In the United Stat