scholarly journals Monitoring and Evaluation of Smolt Migration in the Columbia River Basin : Volume VI : Evaluation of the 2000 Predictions of the Run-Timing of Wild Migrant Chinook Salmon and Steelhead Trout, and Hatchery Sockeye Salmon in the Snake River Basin, and Combined Wild Hatchery Salminids Migrating to Rock Island and McNary Dams using Program RealTime.

1998 ◽  
Author(s):  
Caitlin Burgess
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Sockeye Salmon ◽  
Columbia River ◽  
Monitoring And Evaluation ◽  
Columbia River Basin ◽  
Snake River ◽  
Steelhead Trout ◽  
Run Timing

Population Structure of Columbia River Basin Chinook Salmon and Steelhead Trout

2004 ◽  
Vol 12 (2-3) ◽  
pp. 99-232 ◽  
Author(s):  
ERNEST L. BRANNON ◽  
MADISON S. POWELL ◽  
THOMAS P. QUINN ◽  
ANDRÉ TALBOT
Keyword(s):  
Population Structure ◽  
River Basin ◽  
Chinook Salmon ◽  
Columbia River ◽  
Columbia River Basin ◽  
Steelhead Trout

Influence of pinniped-caused injuries on the survival of adult Chinook salmon (Oncorhynchus tshawytscha) and steelhead trout (Oncorhynchus mykiss) in the Columbia River basin

2011 ◽  
Vol 68 (9) ◽  
pp. 1615-1624 ◽  
Author(s):  
George P. Naughton ◽  
Matthew L. Keefer ◽  
Tami S. Clabough ◽  
Michael A. Jepson ◽  
Steven R. Lee ◽  
...  
Keyword(s):  
Oncorhynchus Mykiss ◽  
River Basin ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Columbia River ◽  
Columbia River Basin ◽  
Small Fish ◽  
Steelhead Trout ◽  
Large Fish ◽  
Density Dependent

Increasing pinniped abundance in the Pacific Northwest has coincided with population declines of Pacific salmon ( Oncorhynchus  spp.) and steelhead trout ( Oncorhynchus mykiss ), and concentrated predation may affect the recovery of some threatened and endangered salmonid stocks. We used radiotelemetry to evaluate pinniped-caused injury effects on migration survival of 17 007 adult Columbia River Chinook salmon ( Oncorhynchus tshawytscha ) and steelhead trout. Injuries from pinnipeds were common (mean injury rate across 29 run-years = 36.5%) and were most common for spring Chinook salmon and steelhead trout. Injury was not consistently associated with adult survival to spawning tributaries, but some negative survival effects were detected. Pinniped-caused injury rates decreased as annual run sizes increased, indicating density-dependent or saturation effects. Within a run, large fish generally had a higher injury incidence than small fish, suggesting pinnipeds targeted large fish or more efficiently captured small fish. Seasonal, size-dependent, and density-dependent results imply that pinniped effects likely differ widely among salmonid populations within the Columbia River basin. A better understanding of these effects is needed to guide management and conservation strategies.

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