Abstract
Cutthroat trout were collected periodically from April 3 to September 20, 1968, by electrofishing and were preserved in formalin. Within a few days, each fish was measured and a sample of scales was taken for study. Scales first appeared on these cutthroat trout immediately above and below the lateral line on the anterior portion of the caudal peduncle. Scales were always selected from this area for study, mounted in glycerin–gelatin, and examined at a magnification of 127 diameters. Scales grow relatively more slowly as the fish increases in length, causing the body–scale relation to be curvilinear. Growth of the fish was determined both by calculating size-at-age data from the scales and by comparing mean lengths of age-groups collected at different times of the year.The growth of cutthroat trout from Chef Creek was slow; calculated mean fork lengths for the first three annuli were 50, 84, and 119 mm. Only a few fish of age-group IV were collected and these were considered to be nonanadromous individuals on the basis of scale examination and small size.
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