a method to direct the fish into a tunnelliknande design by turbines in a hydroelectric power station

摘要

The entrance to the pass is indicated by a dark region in front of it, which is created by a frame connecting together pontoons. The frame includes raised sections for maintaining sufficient clearance between the frame and water to allow floating objects to pass underneath. Fish or smolt follow the boundary between the dark region and the brighter area around the pass entrance.