They are not jellyfish, despite how they appear at first glance. Portuguese man-of-war jellyfish (Physalia physalis) are marine organisms that live in tropical and subtropical environments. They are notorious for their bright blue color and menacing tentacles that can grow to be thirty meters long. In recent years, they have been spotted all across the Mediterranean, from the Spanish and French shores to Italy, particularly in Sicily and Sardinia. According to the WWF, evidence of their presence dates back to the nineteenth century, but never on such a large scale. Their venom can cause skin burns, acute pain, and, in severe circumstances, systemic reactions leading to anaphylactic shock. For this reason, specialists advise against touching them, even after death, as the tentacles can sting for days.
In the event of a sting, immediately submerge the injured region in hot water (about 45 degrees) for at least twenty minutes while waiting for medical attention. Scientists explain that rising water temperatures caused by climate change facilitate their arrival along our beaches. This situation, which has already resulted in the closure of some beaches in the Basque Country, must also be addressed in Italy.