Abstract
Intraseasonal growth curves for lake trout, Cristivomer namaycush (Walbaum), of Lake Superior are deduced from a consideration of the increment in the number of circuli outside the last annulus of the scales as the season (1961) progressed. These curves are generally sigmoid and differ from one another in ways which suggest that they define differences in the onset, rate and duration of growth in the groups of fish concerned. However, the relationship between this measure of scale growth and the more conventional dimensional measures of both scale and fish growth have not been established.

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