Anglers also have problems with algae

800 kg of dead fish indicate a massive problem in the ponds. A fishing club in Ludwigshafen/Rh. did the right thing: with the help of JBL water tests, they first determined the water parameters to get to the bottom of the matter. And now it gets complicated: all the remedial measures that aquarists would take in their aquariums and pond owners in their ponds, anglers MUST NOT carry out!

Leaf fall creates a huge layer of silt in the 6,500 and 7,500 m² lakes, which are between three and four metres deep. However, neither the removal of silt nor the pruning of the trees around the lakes is permitted. Not even measures to reduce the silt are authorised. The city of Ludwigshafen appears to be willing to accept mass fish deaths. Aerators were then purchased at the anglers’ own expense – there was no financial support from the city. JBL provides the dedicated anglers with free water tests so that the condition of the lakes can be fully documented.

Just like an aquarium or a pond, fishing lakes are important places for relaxation, offering great recreational value to many people, not just anglers. Perhaps the city will eventually come to realise that every natural pond will eventually silt up unless regulatory measures are taken in line with biological principles.

Tisk