Spawning Migration of Adult Chinook Salmon (Oncorhynchus tshawytscha) Carrying External and Internal Radio Transmitters

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Abstract
Upstream movements of radio-tagged and control adult chinook salmon (O. tshawytscha) were monitored during spring and fall, 1976 and spring, 1977 in the lower Snake River, southeastern Washington [USA]. Travel time from point of fish release and percent return to upstream trapping facilities were compared for experimental and control fish. Experimental fish carried anchor tags and either external or internal radio transmitters. Control fish carried anchor tags only. Chinook salmon that lost external transmitters moved upriver more slowly than control fish although percent returns to upriver trapping facilities were similar. Travel times and percent returns of chinook salmon that retained external transmitters did not differ significantly from those of control fish. Although some salmon tagged with internal transmitters moved upriver, all failed to cross Little Goose Dam 6.5 km from the release site. Most internally tagged salmon eventually swam downstream.

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