Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 8418
Title: Residency and movement of juvenile Chinook salmon at multiple spatial scales in a tidal marsh of the Columbia River estuary
Author: Regan A. McNatt, Daniel L. Bottom, Susan A. Hinton
Publication Year: 2016
Journal: Transactions of the American Fisheries Society
Volume: 145
Issue: 4
Pages: 774-785
Keywords: juvenile Chinook salmon, residency, habitat use, Columbia River Estuary, growth,

Juvenile salmon use of the Columbia River estuary is garnering more attention as managers look to improve salmon survival through estuary restoration.  Studies have shown that juvenile salmon are abundant in shallow–water habitats within the Columbia River estuary, but information regarding how juveniles exploit specific estuarine habitats is lacking.  In this study we use a combination of physical marks and PIT–tag technology to record residence time, movement, and growth of juvenile Chinook salmon within an emergent marsh of the Columbia River estuary during 2005, 2006, and 2008.  We document marsh–scale residency and movement within the marsh complex and channel–scale residency and movement within two small secondary channels.  Many juvenile Chinook salmon remained in the marsh for two to four weeks and increased in size by 10–20 mm, with an average growth rate of 0.53 mm/d.  Salmon entered secondary channels most frequently in late afternoon and occasionally against the tide.  Our results indicate that subyearling Chinook salmon take advantage of shallow estuarine habitat to a greater extent than previously documented in the Columbia River. 

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Theme: Habitats to Support Sustainable Fisheries and Recovered Populations
Foci: Characterize relationships between habitat and ecosystem processes, climate variation, and the viability of organisms.
Develop effective and efficient habitat restoration and conservation techniques.