The avocet lake
The avocet lake with the two islands was constructed by Cheminova in 1986 as compensation for the covering up of several small polluted lakes between the treatment plant and the chemical dump at Breakwater 42.
The islands were already in use in spring as a breeding site for a large number of avocets and a smaller number of Arctic terns. Black-headed gulls have also bred on the islands in recent years. Cormorants use the islands as a resting place.
Islands used as breeding places are normally safe from predators, but mink, foxes and now also raccoon dogs have been a problem on many islands in recent years. Attempts are being made in spring 2012 to keep foxes and raccoon dogs away from one of the islands in the avocet lake with the aid of a floating cable around the island.