|Document Type:||Journal Article|
|Title:||Early ocean dispersal patterns of Columbia River Chinook and coho salmon|
|Author:||Joseph P. Fisher, Laurie A. Weitkamp, David J. Teel, Susan A. Hinton, Joseph A. Orsi, E. Farley, J. F.T. Morris, M. E. Thiess, R. M. Sweeting, Marc Trudel|
|Journal:||Transactions of the American Fisheries Society|
|Keywords:||Columbia River,Chinook salmon,coho salmon,marine ecology,migration|
Several evolutionarily significant units (ESUs) of Columbia River Basin Chinook salmon Oncorhynchus tshawytscha and Coho salmon O. kisutch are listed as threatened or endangered under the U.S. Endangered Species Act. Yet little is known about the spatial and temporal distributions of these ESUs immediately following ocean entry, when year–class success may be determined. We documented differences in dispersal patterns during the early ocean period among groups defined by ESU, adult run timing, and smolt age. Between 1995 and 2006, 1,896 coded–wire–tagged juvenile fish from the Columbia River basin were recovered during 6,142 research trawl events along the West Coast of North America. Three distinct ocean dispersal patterns were observed:
Used recoveries of tagged juvenile Columbia River Chinook and coho salmon to determine their early marine distribution and migration patterns.
|Theme:||Habitats to Support Sustainable Fisheries and Recovered Populations|
Characterize habitat effects on ecosystem processes, ecological interactions and the health of organisms.
Develop methods, in collaboration with ocean users, to reduce/eliminate fishing gear and other anthropogenic impacts on habitat .