Spatial and trophic overlap of marked and unmarked Columbia River Basin spring Chinook salmon during early marine residence with implications for competition between hatchery and naturally produced fish Public Deposited

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  • Ecological interactions between natural and hatchery juvenile salmon during their early marine residence, a time of high mortality, have received little attention. These interactions may negatively influence survival and hamper the ability of natural populations to recover. We examined the spatial distributions and size differences of both marked (hatchery) and unmarked (a high proportion of which are natural) juvenile Chinook salmon in the coastal waters of Oregon andWashington from May to June 1999–2009. We also explored potential trophic interactions and growth differences between unmarked and marked salmon. Overlap in spatial distribution between these groups was high, although catches of unmarked fish were low compared to those of marked hatchery salmon. Peak catches of hatchery fish occurred in May, while a prolonged migration of small unmarked salmon entered our study area toward the end of June. Hatchery salmon were consistently longer than unmarked Chinook salmon especially by June, but unmarked salmon had significantly greater body condition (based on length-weight residuals) for over half of the May sampling efforts. Both unmarked and marked fish ate similar types and amounts of prey for small (station) and large (month, year) scale comparisons, and feeding intensity and growth were not significantly different between the two groups. There were synchronous interannual fluctuations in catch, length, body condition, feeding intensity, and growth between unmarked and hatchery fish, suggesting that both groups were responding similarly to ocean conditions.
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  • Daly, E. A., Brodeur, R. D., Fisher, J. P., Weitkamp, L. A., Teel, D. J., & Beckman, B. R. (2012). Spatial and trophic overlap of marked and unmarked columbia river basin spring chinook salmon during early marine residence with implications for competition between hatchery and naturally produced fish. Environmental Biology of Fishes, 94(1), 117-134. doi: 10.1007/s10641-011-9857-4
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  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-01-10T16:41:48Z (GMT) No. of bitstreams: 1 DalyElizabethAHMSCSpatialTrophicOverlap.pdf: 1764863 bytes, checksum: 0593adaa28c5985b7ae797df5b4436f2 (MD5)
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2013-01-10T16:37:17Z No. of bitstreams: 1 DalyElizabethAHMSCSpatialTrophicOverlap.pdf: 1764863 bytes, checksum: 0593adaa28c5985b7ae797df5b4436f2 (MD5)
  • description.provenance : Made available in DSpace on 2013-01-10T16:41:48Z (GMT). No. of bitstreams: 1 DalyElizabethAHMSCSpatialTrophicOverlap.pdf: 1764863 bytes, checksum: 0593adaa28c5985b7ae797df5b4436f2 (MD5) Previous issue date: 2011-06-04

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