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Meristic Differences Between Anadromous and Freshwater-Resident Arctic Char (Salvelinus alpinus) in the Sagavanirktok River Drainage, Alaska

1971; Canadian Science Publishing; Volume: 28; Issue: 1 Linguagem: Inglês

10.1139/f71-022

0015-296X

P. McCart, Peter Craig,

Fish Biology and Ecology Studies

Both anadromous and freshwater-resident populations of Arctic char (Salvelinus alpinus) occur in the Sagavanirktok River drainage, Alaska. A comparison of the gill-raker and pyloric-caeca counts of populations of the two types revealed that anadromous fish had lower gill-raker and pyloric-caeca counts than freshwater-resident fish. Freshwater-resident populations correspond meristically to McPhail's Eastern Arctic form, and anadromous population scor-respond to his Western Arctic–Bering Sea form (McPhail, J. Fish. Res. Bd. Canada 18: 793–816, 1961). It is suggested that the former was the original inhabitant of the area but has been replaced by the latter except in inaccessible, headwater lakes.