Large numbers of purple and brown jellyfish have been reported along parts of the Evia coastline, prompting concern among swimmers as experts point to ecological changes behind the phenomenon.

What bathers should know and avoid when spotting jellyfish

Images circulating online show large numbers of jellyfish drifting close to shore. Experts attribute this early influx to the recent rise in temperatures, which appears to favor their premature arrival.

Quick, correct action can prevent serious complications from summer stings and bites — here’s how to respond on the spot.

The purple jellyfish may be beautiful to behold, but swimmers in affected regions should remain vigilant. It is advised to check live beach maps or local advisories before heading into the sea, especially in central and northern Greece and the nearby island chains

However, swimmers are cautioned to avoid touching their face after close contact, as the jellyfish can release mucus that may cause mild swelling.