. The Canadian field-naturalist. 128 The Canadian Field-Naturalist Vol. 102. Figure 2. Distribution of Deepwater Sculpin, Myoxocephalus thompsoni, in Canada: • Identified populations in smaller lakes; //// Extant population in larger lakes: (1) Lake Erie — Rare, possibly Extirpated; (2) Lake Ontario — Extirpated. (Mansfield et al. 1983). The Deepwater Sculpin had declined in abundance in the early 1960s as a result of recruitment failure, perhaps stimulated by Alewife predation/competition (Wells 1980) and possibly cannibalization of their own eggs (Wells 1980). Deepwater Sculpin were reported
. The Canadian field-naturalist. 128 The Canadian Field-Naturalist Vol. 102. Figure 2. Distribution of Deepwater Sculpin, Myoxocephalus thompsoni, in Canada: • Identified populations in smaller lakes; //// Extant population in larger lakes: (1) Lake Erie — Rare, possibly Extirpated; (2) Lake Ontario — Extirpated. (Mansfield et al. 1983). The Deepwater Sculpin had declined in abundance in the early 1960s as a result of recruitment failure, perhaps stimulated by Alewife predation/competition (Wells 1980) and possibly cannibalization of their own eggs (Wells 1980). Deepwater Sculpin were reported as locally common in western Lake Superior during the late 1960s (Anderson and Smith 1971). The studies of Anderson and Smith (1971) suggest that this species was common in the Apostle Islands area, comprising approximately of the total catch, and were the most common species at depths of 50- 59 fathoms ( m). Elsewhere, evidence of the continued well being of this species is provided only by recent collection records. Specimens have been reported from several lakes in northwestern Ontario, an area in which they were previously unknown (G. Gale, Ontario Ministry of Natural Resources, Toronto, Ontario, personal communication). Atton and Merkowsky (1983) also provided recent collection records from northern Saskatchewan which suggest that this species may be common in some lakes. F. Atton (Fisheries Branch, Saskatchewan Department of Parks and Renewable Resources, Saskatoon, Saskatchewan, personal communica- tion) also cautioned against defining population status or trends without further sampling. McPhail and Lindsay (1970) suggested that this fish may be common in Great Bear lake and possibly other lakes of the Northwest Territories. Habitat The Deepwater Sculpin is a bottom dwelling species. In the Great Lakes this species is most abundant at depths greater than 40 fathoms [73m] (Wells 1968; Anderson and Smith 1971; Scott and Grossman 1973). In other lakes,
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