Beachgoers in Terengganu have been cautioned not to touch venomous jellyfish that have recently washed ashore along several stretches of coastline.
Dr Rosmawati Md Amin, a senior lecturer at Universiti Malaysia Terengganu, said the Portuguese man-of-war remains hazardous even after being stranded on the sand. She stressed that the creature’s stinging cells continue to function despite appearing lifeless.
“Although they may resemble pieces of blue plastic washed up by the tide, their tentacles still contain thousands of active stinging cells capable of releasing toxins upon contact,” she explained, dismissing the common misconception that beached specimens are harmless.
Contact with the species — locally known as “ubur-ubur api” or fire jellyfish — can result in severe pain, dizziness, body aches and breathing difficulties. In more serious instances, victims may suffer allergic reactions that require urgent medical attention.
Rosmawati advised the public to wear shoes or sandals while walking along the shoreline to minimise the risk of accidental contact. Fishermen and individuals handling fishing nets have also been reminded to remain vigilant, as jellyfish can become entangled and pose a hidden threat.
The Portuguese man-of-war is frequently driven ashore on the East Coast during the Northeast Monsoon, when strong winds and currents push them towards land, particularly in Terengganu. Recent sightings have been reported at popular beaches including Pantai Pandak and Pantai Paka.
The species can be identified by its translucent bluish hue and distinctive gas-filled float. Typically measuring between two and 10 centimetres, its small size can be deceptive given the potency of its sting.
While vinegar is sometimes suggested as a remedy, its effectiveness depends on the species involved. Warm water is among the recommended options to help ease pain following a sting.

