Fish

ladder....

For the canalization the Leijgraaf was often dry in summer. In the 50s and 60s of the 20th century the Leijgraaf is channeled and there are dams built to regulate the water level. This makes that the Leijgraaf has become a stream with long straight sections. Currently, the Aa and Maas Water activities conducted to make the banks more natural. They also created the dams and fishway or fish passage. Main purpose of this work is that amphibians and fish provide more opportunities to expand their habitat...
(wikipedia)