Project area

Project area

There are several self-sustaining bullfrog populations currently known in Flanders. These consist of several isolated populations in the municipalities of Kasterlee, Hoogstraten, Huldenberg and Sint-Agatha Rode, as well as a large expanding metapopulation along the valley of the Grote Nete in the Province of Antwerp. This population stretches from Balen in the East, to Lier in the West.  It is primarily from this population that bullfrogs are spreading. Logically, the project area is mainly situated within this large metapopulation along the valley of the Grote Nete. In total the project area encompasses 152.000 Hectares, which includes over 400 ponds along more than 50 km of catchment area. Additionally the isolated populations in Kasterlee, Hoogstraten, Arendonk, Huldenberg and Sint-Agatha Rode are also included in the project area.

The first release of sterile bullfrogs will take place in the heart of the population, in the Nature reserve Scheps and close to the Straalmolen in the municipality of Balen. These areas are a part of the Grote Netewoud. Specific netting efforts will also take place in this population to help prevent this population from expanding. These netting efforts use the same techniques as those used for isolated populations.

The map shown below illustrates the currently known populations (bron: Gbif.org, 2015- present day). Current populations are restricted to the provinces of Antwerp, Limburg and Flemish Brabant. Sightings of American Bullfrogs have been reported in some of the other Flemish provinces, but for now these have remained unconfirmed.


The current range of the American bullfrog in Flanders. A particularly large metapopulation is situated in the valley of the Grote Nete.