Don't Panic but keep an eye out! Purple jellyfish outbreak expands rapidly in Greek waters

The Pelagia noctiluca, commonly known as the purple jellyfish, is rapidly proliferating in various areas of Greece, especially in the Pagasetic Gulf, northern Evia, and the Sporades.

The Greek Biodiversity Observatory reports that the species outbreak, noted for its vivid appearance and painful sting, is occurring with more intensity than first anticipated, with conditions resembling the extensive jellyfish blooms seen from 2020 to 2023.

While present data indicate a concentration in certain regions, scientists warn that the spread is expected to persist, potentially moving toward areas like Eastern Attica, influenced by sea currents.

The observatory, which provides a live map showing movement, advises beachgoers and swimmers in impacted areas to stay vigilant, highlighting the species’ potent sting and the dangers it presents, particularly to those with a history of allergic reactions.

According to marine ecologist Professor Stelios Katsanevakis from the University of the Aegean, although the phenomenon is not new, its increasing frequency and intensity are connected to more profound environmental changes.

According to the professor, the primary factors behind these frequent jellyfish blooms are overfishing, which has greatly diminished the numbers of their natural predators, and the expansion of marine infrastructure, which provides more suitable breeding environments for jellyfish and prolongs their life cycles. 

Furthermore, climate change is transforming the marine ecosystem in ways that encourage the growth of jellyfish populations. Rising temperatures and shifts in current patterns have enabled tropical species such as Rhopilema nomadica, which were once found near the shores of Israel or Libya, to appear in Greek waters in recent years.

Professor Katsanevakis highlights that although jellyfish should not incite panic, being aware and taking precautions is crucial. In regions where their population surges, it is advisable to refrain from swimming. He also suggests that wearing UV-protective swimwear can minimize the risk of stings.