Effect of Smolt Release Location and Displacement of Adults on Distribution of Summer Steelhead Trout

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Abstract
Marked smolts of summer steelhead trout (Salmo gairdneri) were released at different locations on the Clackamas River, Oregon, in 1975 and 1976. Adults returning in 1977 and 1978 were tagged, transported, and released at several sites. Distribution and movement of tagged fish were monitored through tag recoveries and fishway counts. The ability of adults to home to the site where they were released as smolts was precise enough to render some release sites unsuitable because of management complications. Movements of adults that were transported upriver from the site where they had been released as smolts depended on the distance they were transported. Fish transported further upstream were less likely to drop back downstream. By careful selection of smolt release location, survival of smolts can be increased and adult fish can be either concentrated in certain stream sections or scattered over several areas.

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