scholarly journals Genetic Variation in DNA of Coho Salmon from the Lower Columbia River : Final Report 1993.

1993 ◽  
Author(s):  
Stephen Fobes ◽  
Kathy Knudsen ◽  
Fred Allendorf
Keyword(s):  
Genetic Variation ◽  
Coho Salmon ◽  
Columbia River ◽  
Final Report

scholarly journals Stock Identification of Columbia River Chinook Salmon and Steelhead Trout, 1986 Final Report.

1986 ◽  
Author(s):  
Carl B. Schreck ◽  
Hiran W. Li ◽  
Randy C. Hjort
Keyword(s):  
Chinook Salmon ◽  
Columbia River ◽  
Final Report ◽  
Stock Identification ◽  
Steelhead Trout

Mitigating Impacts of Natural Hazards on Fishery Ecosystems

2008 ◽  
Keyword(s):  
Coho Salmon ◽  
Radio Telemetry ◽  
Columbia River ◽  
Future Research ◽  
Army Corps ◽  
The North ◽  
Resource Managers ◽  
North Fork ◽  
Natural Resource Managers ◽  
Mount St Helens

<em>Abstract</em>—The North Fork Toutle River drains the northwest face of Mount St. Helens to the Cowlitz River, a major tributary of the Columbia River in southwestern Washington. In response to the 1980 eruption of Mount St. Helens, the U.S. Army Corps of Engineers constructed a sediment retention structure (SRS) in the North Fork Toutle River watershed to reduce the transport of fine sediment to the lower Cowlitz and Columbia River systems. The SRS was built without fish passage facilities and currently presents a significant barrier to migrating adult salmonids. To facilitate passage of coho salmon <em>Oncorhynchus kisutch </em>and steelhead <em>O. mykiss </em>to the upper watershed, a fish collection facility (FCF) was constructed 1.5 km downstream of the SRS, where fish are currently captured and transported to tributaries upstream of the SRS. We used radio telemetry to evaluate the movement of adult coho salmon and steelhead in the North Fork Toutle River in 2005 and 2006. A total of 40 coho and 42 steelhead were released from four different release sites in varied proportions. Release sites included the FCF, the SRS, and Alder Creek and Hoffstadt Creek, both North Fork Toutle River tributaries upstream of the SRS. Results from this research effort suggest that (1) unlike adult coho, adult steelhead are able to ascend the SRS spillway; (2) upstream adult coho and steelhead passage through the sediment plain is possible but may be flow-dependent; (3) adult coho and steelhead released in Alder Creek and Hoffstadt Creek tend to remain within their respective release tributary; and (4) postspawn steelhead emigration is limited. Future research is required to adequately address factors that influence movement of adult coho and steelhead in the upper North Fork Toutle River. The information resulting from this collaborative effort is enabling natural resource managers to determine whether the SRS spillway is a barrier to anadromous fish, to refine existing trap and haul operations, or, if appropriate, to consider modifying the spillway to enable volitional passage by upstream-migrating fish.

Spatiotemporal patterns in migration timing of coho salmon (Oncorhynchus kisutch) smolts in North America

2010 ◽  
Vol 67 (8) ◽  
pp. 1316-1334 ◽  
Author(s):  
Brian C. Spence ◽  
James D. Hall
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Columbia River ◽  
Life Transition ◽  
Regional Patterns ◽  
Migration Patterns ◽  
Watershed Characteristics ◽  
Migration Timing ◽  
Queen Charlotte Islands ◽  
Kodiak Island

The timing of ocean entry by salmon smolts is presumed adaptive to maximize survival during this critical life transition. We analyzed the peak timing, duration, and interannual variation in timing of smolt migrations for 53 coho salmon ( Oncorhynchus kisutch ) populations from central California to Kodiak Island, Alaska. The objective was to examine potential influences of both local watershed characteristics and larger-scale processes in the marine environment on smolt migration patterns. Multivariate analyses demonstrated a strong latitudinal gradient in migration patterns with trends toward later, shorter, and more predictable migrations with increasing latitude. Cluster analysis performed on migration descriptors indicated three major population groupings that coincide with major coastal oceanic regions in the northeast Pacific: a northern group from Kodiak Island to the Queen Charlotte Islands, British Columbia, a central group from the Queen Charlotte Islands south to the Columbia River, and a southern group from the Columbia River southward. These regional patterns transcended local variability associated with watershed characteristics and trap location, suggesting that the patterns reflect adaptation to differences in timing and relative predictability of favorable conditions in the marine environments that smolts enter.

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 2002 Evaluation of Chum, Chinook and Coho Salmon Entrapment near Ives Island in the Columbia River; 2002 Annual Report.

2003 ◽  
Author(s):  
Reed A. Duston ◽  
Jeremy Wilson
Keyword(s):  
Annual Report ◽  
Coho Salmon ◽  
Columbia River
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