A new threat has emerged in Mediterranean waters with the appearance of the silver-cheeked pufferfish (Lagocephalus sceleratus), a species known for its sharp teeth and potent neurotoxin. Originally native to the Indian Ocean, the fish has entered the Mediterranean through the Suez Canal, where it is now increasingly common due to rising water temperatures and salinity linked to climate change.

The silver-cheeked pufferfish poses multiple hazards to both fishermen and swimmers. Its powerful bite has been reported to cause significant damage to fishing nets and to shred catches, while the fish itself is capable of inflicting serious injuries on humans. In one reported incident, an elderly woman was bitten by a pufferfish while swimming near the resort town of Vouliagmeni, close to Athens. The attack occurred without provocation, highlighting the unpredictable nature of this invasive species.

Beyond its aggressive behavior, the pufferfish carries tetrodotoxin, a neurotoxin that can lead to heart and respiratory failure if ingested, making the species unsafe for consumption. It also has no known natural predators in the Mediterranean, allowing its population to grow rapidly and potentially disrupt local ecosystems.

Experts have warned swimmers and beachgoers to exercise caution around the fish. Nota Peristeraki of the Hellenic Centre for Marine Research advised avoiding contact with the pufferfish if encountered. Injuries caused by its bite require immediate cleaning with soap and water, followed by covering the wound with a clean cloth or gauze, and prompt medical attention.

The arrival of the silver-cheeked pufferfish adds to a growing list of invasive marine species, including the lionfish, that are adapting to the shifting conditions of the Mediterranean Sea. As summer holidaymakers return to coastal resorts, awareness of the risks posed by these new species is becoming increasingly important for both safety and environmental management.