Seasonal changes in growth of coho salmon (Oncorhynchus kisutch) off Oregon and Washington and concurrent changes in the spacing of scale circuli Public Deposited

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  • 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. 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. Regression analyses indicated that the spacing of circuli was proportional to the scale growth rate raised to the 0.4-0.6 power. Seasonal changes in the spacing of scale circuli reflected seasonal changes in apparent growth rates of fish. 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. 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. 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. 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. 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.
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  • Fisher, J. P., & Pearcy, W. G. (2005). Seasonal changes in growth of coho salmon (Oncorhynchus kisutch) off Oregon and Washington and concurrent changes in the spacing of scale circuli. Fishery Bulletin, 103(1), 34-51.
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  • Master files scanned at 600 ppi (256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in TIF format. PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale), using Capture Perfect 3.0.82, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Joe Nguyen (jnscanner@gmail.com) on 2009-12-02T21:28:49Z No. of bitstreams: 1 SeasonalChangesGrowthCohoSalmonOregon.pdf: 2264557 bytes, checksum: 59c1fc685ebaa9271f1220f45667162a (MD5)
  • description.provenance : Made available in DSpace on 2009-12-03T14:37:32Z (GMT). No. of bitstreams: 1 SeasonalChangesGrowthCohoSalmonOregon.pdf: 2264557 bytes, checksum: 59c1fc685ebaa9271f1220f45667162a (MD5) Previous issue date: 2005
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2009-12-03T14:37:32Z (GMT) No. of bitstreams: 1 SeasonalChangesGrowthCohoSalmonOregon.pdf: 2264557 bytes, checksum: 59c1fc685ebaa9271f1220f45667162a (MD5)

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