Abstract
Beach seine catches indicated a majority of migrating coho salmon (Oncorhynchus kisutch) smolts reached the upper Columbia River estuary between late April and early June, with peak numbers occurring between 6 and 17 May. Length measurements revealed that large individuals tended to migrate downstream before small individuals. Based on size, most Columbia River smolts were of hatchery origin rather than of natural spawning origin. Recovery of tagged fish showed rates of downstream movement increased from late March to mid-May. Beach seine and purse seine catches suggest greater migratory movement with daylight. The principal prey organisms utilized by smolts were insects in the river and amphipods in the middle estuary and near the mouth. Predation on other fish was minor.
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