Jellyfish: recognize, avoid, coexist
Pelagia, cassiopea, sea lung. Which really sting in Salento, what to do if it happens, and why they are increasing.
Until ten years ago, seeing a jellyfish in Salento was an event. Today, in the months of July and August, scirocco (south-easterly wind) storms can bring thousands in a single night. Not all are dangerous, and many are harmless to touch. Knowing which is which saves you unnecessary panic — and helps you decide whether to enter the water that day.
The five jellyfish of Salento
Pelagia noctiluca · stinging
The most common, and the only truly annoying one. Small (5-10 cm in diameter), violet-pinkish, with red dots. It has long, thin, hard-to-see tentacles. It stings every time you touch it. The sting burns for 20-40 minutes, leaving a red mark for a few days. Not dangerous for those not allergic, but definitely unpleasant. Present from June to September.
Rhizostoma pulmo · sea lung
Huge (up to 80 cm in diameter), white-bluish with purple edges. Looks scary, but is harmless. It only has minimal stinging cells at the tentacle ends, enough to irritate sensitive skin but nothing more. If you see one floating, you can swim safely 2 meters away. It's the "gentle giant" jellyfish of the Mediterranean.
Cotylorhiza tuberculata · cassiopea / fried egg
Brownish with a white edge (hence the name "fried egg"). Up to 30 cm. Harmless. Often carries small fish that use the jellyfish as shelter. If you encounter it, you can admire it.
«Not all jellyfish sting. If you can recognize them, you save yourself a summer of paranoia.»
Physalia physalis · Portuguese man o' war
Rare but very dangerous. Not a jellyfish, it's a colony of organisms. It has a transparent-blue "sail" above the water and tentacles up to 10 meters below. The sting is painful and can cause severe reactions. In Salento, it is reported sporadically (once or twice a season). If you see one, get out of the water and alert the lifeguard. Even stranded specimens are stinging for hours.
Aurelia aurita · moon jellyfish
Transparent with four reproductive circles visible in the center, up to 25 cm. Harmless. Very common, often seen at the shore in summer months. Children can touch it without risk.
What to do if you get stung by the pelagia
99% of jellyfish stings in Salento are Pelagia. Here is the correct protocol, updated to the latest guidelines.
- Rinse with seawater, not freshwater. Freshwater makes the stinging cells left on the skin explode.
- Remove any tentacles with a plastic card (credit card), not with fingers.
- Apply astringent gel with aluminum chloride. Sold in Salento pharmacies for €5-8. Keep one in your beach bag if you are sensitive.
- Do not use ammonia, urine, or vinegar. These are popular remedies debunked by research. Vinegar works only on certain tropical jellyfish, not on Pelagia.
- Do not scratch. Even if it itches, scratching releases more cells.
- If you have nausea, dizziness, difficulty breathing → emergency, call 118. It's rare, but allergic people can have anaphylactic shock.
How to predict a "jellyfish day"
Jellyfish do not distribute evenly. They follow currents and winds. Two recurring patterns in Salento:
- Strong scirocco for 2+ days pushes Pelagia shoals from Greece towards the Adriatic coast of Salento. On the third day, at Torre dell'Orso, Alimini, and San Cataldo, you can find hundreds.
- Libeccio at the end of August brings Rhizostoma (large, harmless) to the Ionian coast. Pescoluse and Torre Pali in particular.
QualeSpiaggia takes into account wind direction and duration, but we do not specifically model jellyfish. If you are sensitive, always check local Facebook groups "Meduse Salento" (which we read every morning to know where they are at that moment).
Why they are increasing
Three factors contribute: sea warming (+1.5°C in the Mediterranean since 1980), overfishing of natural predators (tunas, turtles), and nutrient pollution that favors their reproduction. It's not a short-term reversal: we will have to learn to coexist with them.
The good news: with the right precautions, 9 out of 10 beach days in Salento are still jellyfish-free. The bad: the 10th day can be annoying. The secret is knowing when it's about to arrive.