Anordning för räkning av fisk i fisktrappor eller andra system för att leda vandrande fisk

摘要

The counting device has at least one guide wall (9) pivotally mounted on an axle (8) on the upstream side of a gate (10) or similar narrow passage for the fish to swim through. The wall is made to vibrate as the fish swims through the gate and these vibrations are recorded.