The vertical distribution of juvenile salmon (Oncorhynchus spp.) and associated fishes in the Columbia River plume

Robert L. Emmett, Richard D. Brodeur, Philip M. Orton

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Simultaneous trawling at surface and at depth at one location off the Columbia River, Oregon, in June 2000 identified the depth distribution of juvenile salmonids and associated fishes. Juvenile salmon off the Columbia River were distributed primarily near the surface, within the upper 12 m. Highest densities of subyearling chinook salmon (Oncorhynchus tshawytscha) off the Columbia River were associated with high surface currents and decreasing tidal levels, with time of day possibly a co-factor. Densities of yearling chinook salmon increased with higher turbidity. Pacific herring (Clupea pallasi) was the most abundant and commonly caught forage fish, with density increasing at night, probably related to diel vertical migration. Catches of juvenile salmonids were not associated with catches of forage fishes. Daytime surface trawling appears to be an appropriate method for assessing the distribution and abundance of juvenile salmonids in marine habitats.

Original languageEnglish
Pages (from-to)392-402
Number of pages11
JournalFisheries Oceanography
Volume13
Issue number6
DOIs
StatePublished - Nov 2004

Keywords

  • Columbia River
  • Depth distribution
  • Diel
  • Pacific salmon
  • Surface trawling
  • Tides

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