Pelagia Logbook: August 2025 update on the ongoing Pelagia noctiluca jellyfish bloom in the Aegean sea

We have compiled a map of purple jellyfish (Pelagia noctiluca) records for August.

Most sightings, as expected, were concentrated in the North Evoikos Gulf and the Pagasitikos Gulf. These semi-enclosed gulfs tend to trap jellyfish populations, allowing them to remain for longer periods.

Although summer has ended for most, it is important to remember that a purple jellyfish outbreak can last up to four years. Monitoring continues throughout the winter, and next summer we are likely to see them again, potentially in new areas as well.
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If you spot jellyfish of any species, we encourage you to take photos and upload them to iNaturalist (preferred) or share them in the Facebook group.

Citizen science is an essential tool for monitoring and keeping the public informed!

🙏 Thank you to all citizen scientists and observers contributing to the effort. Every sighting counts!

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