Portuguese man o' war are once again disrupting swimming on the Atlantic coast. Since the end of July 2026, their presence has led to several temporary bans between the Landes region, the Arcachon Basin, and the Basque Coast. Behind their small blue floats lie highly irritating tentacles that can extend over 20 meters. For tourism professionals, the issue primarily requires precise information, beach by beach, without turning a local incident into a general alert for the entire destination.
Summary
Portuguese man o' war are not jellyfish
Confusion is common. The Portuguese man o' war, also known as the "bluebottle," is not a jellyfish. The Nouvelle-Aquitaine Regional Health Agency describes it as a marine organism recognizable by its bluish float and, above all, its long, stinging tentacles.
These filaments can reach several tens of meters in length. ANSES indicates that they can measure more than 20 meters and remain difficult to distinguish underwater, sometimes far from the float visible on the surface.
This is what makes the encounter particularly tricky for a swimmer or surfer: seeing the float does not necessarily allow you to know how far the filaments extend.
Why are some beaches closing?
Since the end of July, several areas of the Aquitaine coastline have experienced occasional interruptions to swimming due to the presence of Portuguese man o' war.
According to the nautical press, Vieux-Boucau and Soustons raised the red flag in early August after specimens were detected near the shore. Swimming had already been suspended in Vieux-Boucau a few days earlier.
The situation can change rapidly. Portuguese man o' war drift according to marine and weather conditions. A beach may therefore be affected at one time of day and no longer be so later.
For tourism professionals, this is a crucial distinction. A temporary closure in one town does not mean that the entire Atlantic coastline is inaccessible. Before assisting a client, it is best to verify the information with the relevant town hall or emergency services.
Even when stranded on the sand, a Portuguese man o' war remains dangerous
This is probably the most important point to convey to vacationers. Never touch a beached Portuguese man o' war, even if it appears dead.
The Nouvelle-Aquitaine Regional Health Agency (ARS) specifies that the filaments remain venomous even when detached from the animal or present on the sand. Contact can cause very painful skin lesions, comparable to a burn or severe hives.
ANSES also mentions the possibility of general reactions, sometimes serious. Feeling unwell, difficulty breathing, or loss of consciousness requires immediate medical attention.
Portuguese man o' war sting: absolutely no fresh water
In case of contact, the official instructions are now very clear. You must first get out of the water immediately.
The Regional Health Agency (ARS) then recommends rinsing the area with seawater, ideally a mixture of one part food-grade vinegar and three parts seawater. Fresh water should be avoided as it can encourage the release of any remaining stinging cells.
Do not rub the area with your hand, cut the skin, suck out the venom, apply urine or use hand sanitizer.
If a first aid station is open, it should be the first point of contact. In case of illness, dizziness, vomiting, loss of consciousness, or other general symptoms, the Regional Health Agency (ARS) recommends contacting the first aid station or the emergency medical services (SAMU) by dialing 15. Pain that persists after 30 minutes should also prompt a visit to the doctor.
The right message for hotels, campsites and tourist offices
For a hotelier or campsite located on the Landes or Basque coast, simply announcing "presence of Portuguese man o' war" doesn't help the customer much. The useful information is far more practical: is the nearest beach open, which flag is flying, and where is the lifeguard station?
The closures observed this summer are decided locally based on the presence of organizations and safety conditions. They may therefore be temporary.
In this context, a tourist establishment benefits from updating its information daily rather than keeping an outdated alert for several days. This is particularly true for campsites, hotels, residences, and tourist offices that cater to families unfamiliar with the Atlantic coast.
Portuguese man o' war: no reason to abandon the entire coast
The return of Portuguese man o' war is a real security issue, but we should not draw excessive conclusions about the entire tourist season.
The authorities have significant lifeguard stations and surveillance systems in place along the coastline. In the Pyrénées-Atlantiques department, the prefecture has announced that thirty lifeguard stations and more than 300 lifeguards will be deployed on the Basque coast during the summer of 2026.
For holidaymakers as well as professionals, the reflex remains the same: look at the flag, respect the instructions of the lifeguards and never handle a Portuguese man o' war, in the water or on the sand.
Updated August 12, 2026: Health information and first aid recommendations have been verified with the Nouvelle-Aquitaine Regional Health Agency (ARS) and the French Agency for Food, Environmental and Occupational Health & Safety (ANSES). Beach closures can change rapidly and should be checked locally before traveling.
Sources
- https://www.nouvelle-aquitaine.ars.sante.fr/physalies-attention-aux-filaments-tres-urticants
- https://www.anses.fr/fr/content/physalies-meduses-vives-les-reconnaitre-pour-mieux-eviter-les-piqures
- https://www.ladepeche.fr/2026/08/07/des-filaments-de-vingt-metres-de-long-une-piqure-tres-douloureuse-pourquoi-la-presence-de-physalies-le-long-des-cotes-atlantiques-fait-fermer-des-13500655.php
- https://figaronautisme.meteoconsult.fr/actus-nautisme-escales/2026-08-04/80093-invasion-de-physalies-ces-meduses-toxiques-qui-forcent-la-fermeture-des-plages-francaises
- https://www.pyrenees-atlantiques.gouv.fr/Actualites/Dispositif-de-secours-et-de-securite-du-littoral-2026
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