A surge in jellyfish sightings in the waters off the Greek island of Evia has sparked concern among residents and beachgoers, as large swarms of purple and brown jellyfish have recently appeared along the coastline.
The phenomenon has been particularly noticeable in the coastal areas of Dafni and Politika, where dense concentrations of jellyfish have been reported. According to local accounts, the swarm stretches across a sea zone of roughly five nautical miles, from Politika to Dafni.
The sight has been described as both striking and worrying, with growing unease among those living in or visiting the area.
Experts note that the increase in jellyfish populations is linked to a significant decline in their natural predators, such as fish species that typically feed on them. This ecological imbalance is believed to have contributed to their rapid and widespread growth.
The species most commonly observed in the area is the purple jellyfish, known scientifically as Pelagia noctiluca. It is found in warm and temperate seas worldwide and is recognized for its bioluminescent properties, meaning it can emit light in dark conditions.
Despite its small size and colorful appearance, the jellyfish is covered in stinging cells both on its tentacles and its bell. Encounters with humans are frequent and often painful. In some cases, however, jellyfish swarms have been reported to significantly impact marine environments, including fish farms.
Contact with the jellyfish can cause a range of symptoms, including burning pain, skin redness and swelling, and occasionally more severe reactions such as nausea, low blood pressure, rapid heartbeat, and breathing difficulties. In rare cases, more serious systemic symptoms may require urgent medical attention.
Health authorities advise that in the event of a sting, affected areas should be rinsed with seawater, tentacles should be carefully removed without direct hand contact, and cold compresses may be applied to reduce irritation. Medical assistance is recommended if symptoms persist or become severe.
