On watercourse, weir and dam prevent migratories fishes to go up the stream to spawning areas. Fish passes (also called fish ladder or fish scale) are built in order to allow fishes to overcome these obstacles.

The principle is to lead the fish from one pond to another considering that the device can change depending on the general slope.

Our studies office commits to construct these device in a natural way to avoid any artificial character and promote its integration in the landscape.