Nature conservation organisation Natuurmonumenten wants to limit the number of commercial activities taking place in natural reserves by introducing permits and charges, the Telegraaf reported on Monday.

Professional dog walkers, yoga teachers, photographers and mountain bikers will have to ask permission for their activities, and pay a charge, Natuurmonumenten has said.

Ceremonies such as depositing ashes and placing small memorials in honour of the dead will no longer be allowed either. Charges will start from €50 and companies will have to ask permission six weeks ahead of the event.

“It all depends on the activity and the place. It is up to the local park wardens,” Natuurmonumenten spokeswoman Naomi Persoon told the paper.

Yoga teacher and bootcamp organiser Mark Nauts, who uses the Brunsummerheide heathlands as an outdoor classroom, said he would have to give up. “It would no longer be viable,” he said.

From 2025 dog walkers will no longer be able to walk three or more dogs at the time in Natuurmonumenten reserves either, to prevent attacks on deer and sheep.

Forestry commission Staatsbosbeheer is also contemplating limiting the number of dogs and other changes. “If it’s a small yoga club that meets weekly, that won’t be a problem. But bigger events will need permission from the park authorities,” the organisation said.