"How do fish ladders work? Fish that encounter obstacles during their migration upstream can be guided in the direction of the fish ladder by means of attracting currents. There are …
The Prüm is a 95 km long, orographically left tributary of the Sauer in the Eifel. It flows in the Vulkaneifel district and Eifelkreis Bitburg-Prüm in Rhineland-Palatinate. The river is …