scholarly journals Ecology of Juvenile Salmonids in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2007 Annual Report.

2008 ◽  
Author(s):  
Kathryn Sobocinski ◽  
Gary Johnson ◽  
Nichole Sather
Keyword(s):  
Annual Report ◽  
Columbia River ◽  
River Delta ◽  
Tidal Freshwater ◽  
Juvenile Salmonids ◽  
Freshwater Habitats

scholarly journals Ecology of Juvenile Salmonids in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2007

2008 ◽  
Author(s):  
Kathryn L. Sobocinski ◽  
Gary E. Johnson ◽  
Nichole K. Sather ◽  
Adam Storch ◽  
Tucker A. Jones ◽  
...  
Keyword(s):  
Columbia River ◽  
River Delta ◽  
Tidal Freshwater ◽  
Juvenile Salmonids ◽  
Freshwater Habitats

Residence times of juvenile salmon and steelhead in off-channel tidal freshwater habitats, Columbia River, USA

2015 ◽  
Vol 72 (5) ◽  
pp. 684-696 ◽  
Author(s):  
Gary E. Johnson ◽  
Gene R. Ploskey ◽  
Nichole K. Sather ◽  
David J. Teel
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Chinook Salmon ◽  
Coho Salmon ◽  
Columbia River ◽  
Tidal Freshwater ◽  
Life History Strategies ◽  
Residence Times ◽  
Juvenile Salmonids ◽  
Freshwater Habitats

We documented two life history strategies for juvenile salmonids as expressed in off-channel tidal freshwater habitats of the Columbia River: (i) active migrations by upper river Chinook salmon (Oncorhynchus tshawytscha) and steelhead (Oncorhynchus mykiss) during the primary spring and summer migration periods and (ii) overwinter rearing in tidal freshwater habitats by coho salmon (Oncorhynchus kisutch) and naturally produced Chinook salmon mostly from lower river sources. During spring–summer 2007–2008, acoustic-tagged fish originating above Bonneville Dam (rkm 234) had short residence times in off-channel areas (rkm 192–203): median 2.5 and 2.6 h for yearling (mean lengths 134 and 158 mm) and 3.0 and 3.4 h for subyearling (104 and 116 mm) Chinook salmon and 2.5 h for yearling steelhead (215 mm). The percentage of fish in off-channel areas out of the total in the main- and off-channels areas was highest for yearling Chinook salmon (8.1% and 9.3% for 2007 and 2008, respectively) and lowest for steelhead (4.0% for 2008) and subyearling Chinook salmon (3.6% and 6.1% for 2007 and 2008, respectively). In late January and early February 2010, 2011, and 2012, we captured and tagged yearling Chinook and coho salmon occupying off-channel tidal freshwater habitats. Median residence times in off-channel areas were 11.6–25.5 days for juvenile Chinook (106, 115, and 118 mm, respectively by year) and 11.2 days for coho salmon (116 mm). This study is the first to estimate residence times for juvenile salmonids specifically in off-channel areas of tidal fresh water and, most importantly, residence times for Chinook salmon expressing a life history of overwintering in tidal fresh water. The findings support restoration of shallow off-channel habitats in tidal freshwater portions of the Columbia River.

scholarly journals Ecology of Juvenile Salmon in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2008

2009 ◽  
Author(s):  
Nichole K. Sather ◽  
Gary E. Johnson ◽  
Adam Storch ◽  
David Teel ◽  
John R. Skalski ◽  
...  
Keyword(s):  
Columbia River ◽  
River Delta ◽  
Tidal Freshwater ◽  
Juvenile Salmon ◽  
Freshwater Habitats

Survival Estimates for the Passage of Juvenile Salmonids through Snake and Columbia River Dams and Reservoirs, 2002-2003 Annual Report.

2003 ◽  
Author(s):  
William D. Muir ◽  
Steven G. Smith ◽  
Richard W. Zabel
Keyword(s):  
Annual Report ◽  
Columbia River ◽  
Juvenile Salmonids
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