Swimmers in the Euboean Gulf have faced years of disruption due to the mass arrival of jellyfish, which frequently cause painful stings and, in rare instances, severe allergic reactions. To address this persistent issue, the Municipality of Chalkideon has initiated the installation of specialized floating barriers, a measure similar to those typically used for containing marine pollution.
The rollout began in mid-June at Rodies beach in Chalkida, with the project representing a total investment of €366,950.10. Specialized divers are tasked with installing these systems across six municipal beaches, including Alykes, Mpourntontas, Valopoula, Kalamia, and Zephyros. Concurrently, the Ports Organisation of Evia (OLNE) is preparing to implement similar protective measures at the beaches of Sykies, Kourenti, Souvala, and Papathanasiou.
Expressing support for the project, the Mayor of Chalkideon thanked the Region of Central Greece for the funding, noting that the barriers will help limit the entry of jellyfish and floating waste, thereby improving beach safety and the overall experience for residents and visitors. Experts confirm that such barriers can be effective if installed correctly, as they create a sealed, semi-circular or rectangular safety zone that prevents both jellyfish and fish, such as the pufferfish, from entering the bathing area.
For the system to function as intended, the net must extend from the shore into deeper water and return to the land. The bottom of the net requires weighted chains to maintain contact with the seabed, minimizing gaps where marine life might slip under. Furthermore, the top must feature reinforced buoys standing 30 to 50 centimeters above the surface to prevent jellyfish from washing over the barrier during rough seas. While the initiative has been welcomed, some beachgoers at Rodies have raised concerns regarding the depth of the placement, noting that it restricts the available area for swimming. To maintain ongoing efficacy, authorities must ensure regular cleaning by specialized crews to prevent the accumulation of seaweed and marine organisms, which can weigh down or damage the nets.
