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Passage of Salmonids Through a Darkened Fishway

Abstract
An experiment to produce specific information on rate of ascent of salmonids through a darkened fishway was conducted in a short, pool-and-overfall fishway without submerged orifices. The fish (98 percent steelhead - Salmo gairdneri) negotiated the 6-pool fishway significantly faster in near-total darkness than in light conditions approximating a bright, cloudy day.
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article
Date
1959
Publisher
US Fish and Wildlife Service
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