Dangerous "False Jellyfish" Forces Beach Closures in Southwest France
If you're planning a beach trip along the Basque coast or Landes region this summer, it's worth paying close attention to the red flags flying on several beaches. Over the past few days, a surprising yet dangerous visitor from tropical waters has made an unexpected appearance: the Portuguese man o’ war, or Physalia physalis . Despite its jellyfish-like appearance, it's not actually a jellyfish—it’s a siphonophore, a colonial organism made up of several specialized bodies working together.
This striking marine creature, often called a “false jellyfish,” is instantly recognizable by its translucent pinkish-blue bladder that floats on the surface. But the real danger lies beneath: tentacles that can extend up to 20 meters long—and are highly venomous. Even when washed up and apparently lifeless on the beach, their sting remains potent.
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In response to their sudden and significant presence, several beaches from Bidart to Anglet, including Uhabia, Ilbarritz, and the Petite Chambre d’Amour, have been closed since Friday, July 25th. Red flags have been raised, meaning swimming is strictly forbidden. The same scenario has unfolded further north in the Landes region, where beaches like Cap de l’Homy and Seignosse’s Le Penon have also been shut down.
The closure comes at the height of the tourist season, understandably frustrating for vacationers—but authorities aren’t taking any chances. The venom delivered by these creatures can cause extreme pain, skin burns, rashes, and in rare cases, even cardiac complications. Though the specimens currently spotted in France are smaller and less aggressive than those typically found in tropical waters, they are still considered a serious health hazard.
So, what should you do if you come into contact with one? First of all, don’t rinse the affected area with fresh water—that only activates the stinging cells further. Instead, rinse with seawater, apply shaving foam if available, and gently remove any remaining tentacles using a rigid card like a credit card. And absolutely do not rub the area with your hands. If symptoms worsen or breathing difficulties occur, head straight to a lifeguard station or call emergency services.
The presence of Physalia physalis this far north is unusual but not unprecedented. Some experts link these migrations to rising ocean temperatures, another sign of how changing climate conditions are affecting marine life—and our daily lives.
So for now, swimmers are being kept on dry land, and caution is strongly advised. It’s a vivid reminder that nature, as beautiful as it is, always deserves our respect.
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