October 13, 2021

Trapping efforts for 2021 are still ongoing. The final trapping efforts are currently taking place in Heist-Op-Den-Berg, among other places, where the Natuurwerk team has caught a few large specimens in the fykes. Rtv came by for a short report:

July 5, 2021

American bullfrogs, where do they come from and how can you recognize them? What is on their diet and why is the species so harmful to our nature? How are we going to eradicate this threat to our nature? You will find out this and much more in the small exhibition that we have set up and which is now ready for viewing in the Grote Netewoud visitor center. The exhibition can be visited all summer, so be sure to take a look if you have a summer walk planned in the area.

Speaking of summer walks, on August 22 our local division of Natuurpunt is organising a guided walk in the area, with the American bullfrog as its main topic. You can combine a visit to our exhibition with a refreshing walk in the nearby Griesbroek, where you will almost certainly encounter some bullfrogs.

July 4, 2021

The first pond has now been cleared of all fish, drained and cleaned. All we have to do now is wait until everything has settled and we can release the first tadpoles in our enclosures.

May 21, 2021

All pond are now properly fenced. Next step is to prepare the actual ponds for releasing sterile tadpoles. We will need to catch and relocate all fish that are present in the ponds, drain them and clean them out.

Today also happens to be the Birthday of Nature, which we celebrate with a walk in the Griesbroek nature area. 

May 3, 2021

Construction works are going as planned, small dykes have been erected around the ponds to help protect against floods and the first pond is now fulle fenced.


March 25, 2021

The last few sunny days have caused an explosion of amphibian activity in our ponds. Sadly there are also American bullfrogs present and reproducing in these ponds. Before we can use the ponds for raising sterile frogs, the fish and amphibian populations need to be removed and relocated.

Left: common frog and common toad spawn - Right; an adult common toad and a bullfrog tadpole

March 22, 2021

Construction works have commenced for our first site with four ponds in Olmen, where we will be rearing sterile tadpoles and juvenile frogs. The trees surrounding the ponds have been cleared. Luckily most of these were exotic species with fairly low ecological value.

Now that the trees have been cleared, the terrain will be leveled and fencing will be installed around the ponds. This fence (with 1 cm mesh size) prevents escaping frogs and at the same time also prevents animals from entering the ponds from outside. This way the sterile animals can grow up peacefully and safely.



December 11, 2020

The Life 3n-bullfrog project has started around a year ago. But how do we plan to eradicate bullfrogs from Flanders and why is this important? Find out in this info video

August 28, 2020

Yesterday the LIFE 3n-bullfrog project was covered by the news. Fykes, frogs and tadpoles were examined with great interest while our project employees gave explanations. Did you miss it? You can view and read the various reports again with the links below:

August 27, 2020

Today we presented our project to the press. You can read the press release here.

August 14, 2020

We now have a informational folder, which you can download here.

June 16, 2020

Follow us on our newly setup social media pages on youtube, facebook and twitter.

May 6, 2020

To be able to catch even the smallest bullfrog tadpoles, we now use fykes with a mesh size of only 5 mm! The leader is also a bit longer to improve catch efficiency.

fuik voor stierkikkerlarven

May 4, 2020

The first bullfrogs of the 2020 season have arrived in the PXL Bio-Research lab. The breeding season can now fully start! Excellent work by Natuurwerk vzw!

April 25, 2020

Our LIFE project can now also be found on Twitter:

April 10, 2020

Have you spotted or heard a bullfrog? Let us know!

It is of the utmost importance to act quickly on new sightings of American bullfrogs. And for that we need your help! Have you seen or heard a bullfrog? Enter your sighting on

December 2019

The LIFE 3n-bullfrog project officially started in October. Fieldwork preparations have started, and so has the development of a project logo.