SALTONSTALL KENNEDY GRANT PROGRAM
Pinniped-Salmon Co-Occurrence: Assessment....
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GRANT NUMBER:  97-NW-04

REPORT TITLE:  Pinniped-Salmonid Co-Occurrence: Assessment of Potential Impacts of Pinnipeds on Salmonids in Selected Estuaries

AUTHOR:

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AVAILABLE FROM: National Marine Fisheries Service, National Program Office, 1315 East West Highway, Silver Spring, MD 20910.  TELEPHONE:   (301) 713-2358

ABSTRACT

A pilot program was conducted in the Alsea, Rogue and Umpqua Rivers in Oregon in the fall of 1997 when pinnipeds (Pacific harbor seals and California sea lions) were known to occur in the mouths of these rivers during the migration of coho salmon. Methodology included surface foraging observations and pinniped scat collection in the Alsea and Rogue Rivers, scat collection in the Umpqua River, and pinniped scarring data collection at a hatchery in the Alsea River system. The data collected during the fall season of 1997 were determined to not be adequate for an assessment of pinniped impacts on salmon. Investigators identified the need to adjust and expand studies to include more observations especially upriver in the systems, increased scat sampling, and multi season work to address interannual variability.

 
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