BANGKOK, Thailand – Mu Ko Similan National Park has issued an urgent safety warning and temporarily suspended swimming at certain locations after detecting Blue Button organisms (Porpita porpita) along the coastline.
On February 24, 2026, park officials announced the temporary closure of the eastern swimming zone (Front Beach) on Ko Si (Island 4) until conditions are safe. The Blue Button is recognized by its vibrant blue color and central disc-like body with numerous tentacles. These organisms drift with sea currents and often wash ashore in clusters.
Although Blue Button stings are generally less severe than those of the Box Jellyfish, contact can cause sharp pain, stinging, rashes, swelling, and blisters. Officials warn that these organisms can still cause skin irritation after washing ashore and advise the public to avoid direct contact.
If contact occurs, rinse the affected area with seawater only. Do not use fresh water or rub the wound, as this may release more toxins. Carefully remove any remaining tentacles. Seek medical attention immediately if rashes spread or symptoms are severe.
The National Park office requests that tourists report any sightings to on-site staff and follow all safety instructions to ensure public safety. (NNT)
