National Park officials in southern Thailand are hunting a group of Chinese tourists after they took several urchins out of the sea.
They then bashed them and left them on the beach on Adang-Rawee Island in the Tarutao National Park.
Park chief Kanchanaphan Khamhaeng said there were signs in many languages including Chinese to leave the aquatic life alone.
A police report was filed. The Chinese face a fine of between 5,000 and 50,000 baht.
Kanchanaphan said that cases like this were always followed up. He thanked an environmentalist called Somsak, 38, for bringing it to the attention of the authorities.