Enumeration of Spawning Salmon from Spawner Residence Time and Aerial Counts

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Abstract
A method for estimating populations of spawning chinook salmon Oncorhynchus tshawytscha using aerial counts and residence time of spawning females is presented. Studies of spawning female chinook salmon in the Morice River, British Columbia showed that as the spawning season progressed, the residence time at the redd site decreased. The population estimate method described here is based on several aerial counts and incorporates a correction for the observed difference in residence time.