PHANG NGA, THAILAND – Blue-button jellyfish were discovered in designated swimming areas of Mu Ko Similan National Park, prompting precautionary closures and urgent safety warnings for visitors.
Warning issued in popular marine national park
Park officials in Mu Ko Similan National Park in Thailand’s Phang Nga province reported occurrences of blue-button jellyfish along beach sections inside marked swimming zones. The eastern side of Island No. 4, particularly the Hat Na beach section, was especially affected, where the animals were sighted within the buoyed bathing areas.
Striking appearance and movement of blue-button jellyfish
The blue-button jellyfish were described as bright blue with a distinctive round, button-like disc in the center surrounded by numerous tentacles. The marine organisms typically drift with currents, are pushed toward the coast by winds, and can therefore also be washed up onto the beach.
Health risks and typical symptoms
According to the park, the toxin of blue-button jellyfish was considered less potent than that of box jellyfish, but contact could still cause an immediate burning or stinging sensation. Park information stated that red skin rashes, swelling, itching, or small fluid-filled blisters could occur, and even stranded animals on the sand could continue to cause skin irritation and should not be touched directly.
First aid guidance and emergency response
Park officers recommended rinsing affected skin areas with seawater as a first step, avoiding fresh water initially and not rubbing the wound. Remaining tentacles should be carefully removed, and people experiencing severe pain, spreading rashes, or unusual symptoms were advised to report immediately to park staff.
Swim zone closure and reporting duty for visitors
As a precaution, the national park temporarily closed the eastern Hat Na swimming zone on Island No. 4 until conditions were deemed safe again. Visitors who noticed blue-button jellyfish in other parts of the park were urged to inform officials immediately and follow all issued safety instructions strictly.