|Title:||Distribution, abundance, and growth of juvenile salmonids off the Pacific Coast from Tillamook Bay, Oregon, to Copalis Head, Washington, May-September, 1980|
|Author/Editor:||David R. Miller, John G. Williams, Carl W. Sims|
|Institution:||Northwest and Alaska Fisheries Center Processed Report|
Juvenile salmonids (<50 cm) were sampled by purse seine off the Washington and Oregon coasts from May through September 1980. Temporal distribution and abundance of the major Columbia River species were determined. Spring chinook salmon (Oncorhynchus tshawytscha) and steelhead (Salmo gairdneri) were present only during early cruises and were distributed almost entirely in the Columbia River plume and the sample area to the north. Coho salmon (O. kisutch) and fall chinook salmon were distributed more uniformly throughout the sampling area and were relatively abundant throughout the sampling period. Concentrations of fish were found almost entirely within 20 km of the shore. Significant numbers of fish that had been marked before or during their outmigration from Columbia River system were recaptured. It appeared possible that with concentrated sampling in areas with high fish abundances, sufficient numbers of marked juvenile salmonids could be captured to provide relative survival estimates between different stocks of Columbia River fish.