The department said in a statement that the Chiropsoides buitendijki marine species have been spotted in the sea at Klong Dao beach in Krabi province with a concentration of 12 jellyfish per 100 square metres, and at the Si Kao beach in Trang province with 14 jellyfish per 14 square metres.

The department advised tourists stung by the jellyfish to wash the wound with vinegar for at least 30 seconds.