The Park's management decided to take this step owing to the fact that the natural nest-sites of  Common as well as Little Terns are becoming increasingly endangered and that their breeding success is small as a result of the rigours of the weather and land predators. With the iad of the LIFE programme financial means, part of the abandoned salt-pans was transformed into islands for the breeding terns. The islands' design follows the shape of salt-fields, surrounded by wooden enclosure, while the surface is covered by sand. Around the area, a ditch was dug, whereas the entire area is indindated with seawater that will stop the foxes, martens and other predators reaching the nest-site. In the ditch, wooden gates were built for the regulation of seawater inflow around the islands.