A Trap for the Capture of Fish and Other Organisms Moving Downstream

Abstract
In connection with a study of salmon and trout in a Swedish river, a trap was developed which has proved successful in capturing, unharmed, downstream‐moving fish and other organisms. It consists of a fine‐meshed screen set at a slight angle to the horizontal, on which water falls after passing over a weir. Fish and other solid particles are caught by the screening and washed down the incline into a trap placed below the lower end of the screen. The device is comparatively simple in design and construction, operates efficiently under widely varying amounts of flow, and may be left untended for periods up to 3 weeks in duration.

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