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In the spring of 19*+9 and the spring and summer of 1950, a study was made of the biology of the Arctic grayling (Thymallus signifer) in the southern parts of the Athabaska drainage. Measurements which were taken on fish from Alberta and Saskatchewan indicate that no racial differences exist between fish from two widely separated areas. The study of growth rates demonstrated that stream grayling grow at a slightly slower rate in the Athabaska drainage than the lake fish studied by other authors, and that the rate varies from stream to stream. There is an indication of a correlation between growth rate and bottom food0 However, grayling are versatile feeders and terrestrial insects are important in the summer diet. Sexual maturity is reached at the end of the third year of life. Spawning takes place in May after the fish have migrated into the smaller streams. Various aspects of the spawning habits are described. After spawn¬ ing, the fish remain in the stream for the summer, then leave in the autumn before ice formation is extensive.

The biology of the Arctic grayling in the southern Athabaska drainage