Their hatching cycle coincides with the Olympics as they come ashore to lay eggs by the end of May and hatching starts at the beginning of August.
"This is one of the worst ecological scandals in the
European Union," said Lilli Venizelos from a turtle conservation group.
Activists have reported speed boat races in the harbour and tourists swarming onto the beaches.
The WWF called on Greece to stop a tourist "free for all"
from destroying important habitats.