Title
Passage of Salmonids Through a Darkened Fishway
Publication Date
1959
Keywords
day/night samples, fish passage, light conditions, orifices, pool and weir, rate of passage, salmonids, steelhead
Report number
Fisheries No. 300
Publisher
US Fish and Wildlife Service
Series Title
Special Scientific Reports
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.