The alert was announced by the Department of Marine and Coastal Resources (DMCR), citing findings from the Upper Andaman Sea Marine and Coastal Resources Research Center. The report followed confirmation from marine biologists at the Sirindhorn Rare Marine Animal Rescue Center, who identified the species after collecting samples.
Officials confirmed the jellyfish as Pelagia, commonly known as ‘fire jellyfish’, measuring around two to three centimetres in size. Despite their small appearance, the species can cause painful stings, itching and skin irritation upon contact.
Initial reports indicated that several tourists and boat crew members experienced minor stings and irritation after encountering the jellyfish in the area. Following the warning, most visitors suspended swimming and other water activities as a precaution.
Authorities are now actively notifying marine tourism operators and visitors, urging temporary suspension of sea activities around Koh Mai Thon until conditions improve. Safety guidance, including first aid instructions, is being distributed via QR codes to help reduce risks and ensure preparedness.
Officials noted that stinging jellyfish are commonly found during high tide and in certain seasonal conditions, and urged the public to remain vigilant.
Tourists and residents are advised to avoid entering the water if jellyfish are spotted or if warning notices are in place. Anyone stung should seek appropriate first aid immediately.