. The Canadian field-naturalist. Natural history. 628 The Canadian Field-Naturalist Vol. 115 Cape Breton Counties and have been reported from Annapolis, Halifax and Richmond Counties (Semple 1973; Edge 1987). Although not normally associated with brackish and saltwater habitats, the Lake Whitefish has been recorded along the east coast of James Bay, shores of Hudson Bay, and in brackish water adjacent to Ungava Bay (Scott and Scott 1988). It also occurs in brackish water in Arctic Ocean drainages of the Northwest Territories (Scott and Crossman 1973). The species also may occur in Atlantic coa
. The Canadian field-naturalist. Natural history. 628 The Canadian Field-Naturalist Vol. 115 Cape Breton Counties and have been reported from Annapolis, Halifax and Richmond Counties (Semple 1973; Edge 1987). Although not normally associated with brackish and saltwater habitats, the Lake Whitefish has been recorded along the east coast of James Bay, shores of Hudson Bay, and in brackish water adjacent to Ungava Bay (Scott and Scott 1988). It also occurs in brackish water in Arctic Ocean drainages of the Northwest Territories (Scott and Crossman 1973). The species also may occur in Atlantic coastal drainages but reports of this species in salt water off the Atlantic Coast of Canada have generally been in reference to the Atlantic Whitefish, with the excep- tion of one Lake Whitefish specimen caught in salt water off Black's Harbour, New Brunswick (Scott and Scott 1988). The Mira River population of Lake Whitefish has been found only in the Mira River (46°02'N 59°58'W) and the Salmon River (45°55'N 60°18'W), Cape Breton Island, Nova Scotia (Figure 3). The Salmon River is a tributary of the Mira River. Col- lection sites reported by Edge (1987) were approxi- mately 10 km apart. The population of Lake Whitefish from the Mira and Salmon Rivers is geographically separated from other extant populations of this species in the rest of Nova Scotia by St. Georges Bay and the Strait of Canso. Although Lake Whitefish are tolerant of salt water and may sometimes act in an anadromous fashion, they rarely stra^ too far from their rivers of origin and therefore would not likely disperse to other areas through marine waters. Despite relatively extensive sampling including field surveys conduct- ed during 1982, 1983 and 1985, Lake Whitefish have not been found at any other localities in Cape Breton Island, particularly the Lake Ainslie and Lake O'Law Brook localities where they were reportedly stocked in the later part of the last century (Edge 1987). The Mira and Salmon Rivers ar
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