The Wiese has been very a rich fishing river since time immemorial. Its numerous side branches, gravelly river bed, shady riparian woods and flow conditions provided optimal conditions for fish and other aquatic life. Many chronicles refer to the variety and quantity of salmon. In the Early Middle Ages the fishing grounds were still accessible to everyone, but no later than the implementation of royal rights by the Frankish kings, was the fishery ("Fischweid") established, whereupon the general use of the river by the population was forbidden.