Portuguese galeae trigger beach closures along France's Atlantic coast

Authorities have closed multiple beaches on France’s Atlantic shoreline after a surge of sightings of the Portuguese galea (Physalia physalis). Affected sites include Anglet, Ilbarritz near Biarritz, Mimizan, and stretches in the Basque Country, Landes and Brittany. The siphonophore’s long tentacles, up to 30‑50 metres, carry a potent neurotoxin that can cause intense burning pain, skin lesions and, in severe cases, allergic shock. Even dead specimens and detached tentacles remain toxic for several days, prompting officials to raise red or violet warning flags and prohibit any handling of the organisms.

Local rescue services advise rinsing any contact wounds with seawater only, avoiding fresh water or alcohol, and seeking medical help for serious symptoms. The phenomenon has also been reported in Aquitaine’s coastal waters, leading to temporary bans on swimming in the Arcachon basin and other beaches. Experts link the increased presence to rising sea‑surface temperatures that expand the species’ range. Portuguese coastal authorities have taken similar precautionary measures.

The closures affect tourism and public safety along a large portion of the French Atlantic coast, with health officials urging the public to stay clear of the blue‑violet organisms.