![]() description.provenance : Submitted by Joe Nguyen ( on.description.provenance : Made available in DSpace on (GMT).CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale), using Capture Perfect 3.0.82, on a Canon DR-9080C. Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in TIF format.College of Oceanic and Atmospheric Sciences.Seasonal changes in growth of coho salmon (Oncorhynchus kisutch) off Oregon and Washington and concurrent changes in the spacing of scale circuli. Our results indicate that seasonal change in the spacing of scale circuli is a useful indicator of seasonal change in growth rate of coho salmon in the ocean. Average apparent growth rates of groups of maturing coded-wire-tagged coho salmon caught in the ocean hook-and-line fisheries also decreased between June and September. Average growth rate of maturing fish was about 2 mm/d between May and June, then decreased to about 1 mm/d between June and September. Changes over time in length of fish caught during research cruises indicated that the average growth rate of juvenile coho salmon between June and September was about 1.3 mm/d and then decreased during the fall and winter to about 0.6 mm/d. ![]() Spacing of circuli at the scale margin was greatest during the spring and early summer, decreased during the summer, and was lowest in winter or early spring. Seasonal changes in the spacing of scale circuli reflected seasonal changes in apparent growth rates of fish. Regression analyses indicated that the spacing of circuli was proportional to the scale growth rate raised to the 0.4-0.6 power. Average spacing of scale circuli and average rate of circulus formation were significantly and positively correlated with average growth rate among groups of juvenile and maturing coho salmon and thus could provide estimates of growth between age groups and seasons. In this study we present new information on seasonal variation in absolute growth rate in length of coho salmon (Oncorhynchus kisutch) in the ocean off Oregon and Washington, and relate these changes in growth rate to concurrent changes in the spacing of scale circuli.Citeable URL: Descriptions Attribute Name
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