Blue jellyfish swim in the shallows of the waters of Thermaikos – Watch the video


“Although every year we have jellyfish, now their density is higher” comments the professor of the Department of Biology of the Aristotle University of Thessaloniki, Hariton-Charles Hintiroglou

As the professor of the Department of Biology of the Aristotle University of Thessaloniki explains in GRTimes, Chariton-Charles Hintiroglou«these jellyfish come from the sea currents. They are carried and carried by the movement of water. Although every year we have jellyfish, now their density is higher».

According to Mr. Hintiroglou, “these jellyfish usually come in the shallows». This is the reason why, as you will see in the GRTimes pictures from Thursday, it is easy to be noticed by passers-by on the beach.

As he further analyzes, “spread depending on the waves and the turbulence of the waters». He himself, explaining why blue jellyfish meet on the surface of Thermaikos, explains that “are animals that want light, ie do not have shade-loving behavior, so they move in the water column».

In addition, Mr. Hintiroglou points out that blue jellyfish usually appear at the end of July, adding that “We have them every year in Thessaloniki, but now we observe them more because they have a high density».

What do blue jellyfish cause?

According to the Hellenic Biodiversity Observatory, if our jellyfish touch us we feel a burning and itching, but due to the mucus with the toxins they release into the water we can feel the burning and itching even if we do not touch them and just swim next to them.

Although one can easily push them off their bell and due to their size it is difficult for someone to fall on them, he wants great care if someone touches them not to touch his face because it will swell immediately (it is like touching a chilli pepper inside and then resting on your face).

Activate JellyReport for weekly updates

JellyReport will be published every Sunday with useful information on jellyfish appearances for the month we are in, for weather conditions such as winds coming next week and other information regarding jellyfish in general.

For proper information, citizens are invited to upload their registrations to iNaturalist through the website: or the corresponding application “iNaturalist” that exists for android and ios mobiles.

As the Hellenic Biodiversity Observatory points out, the systematic refusal of some citizens to take personal care only of their own baths and not to spend 1-2 minutes to put jellyfish recordings in iNaturalist creates a small problem of lack of proper information about which beaches they have jellyfish appear, what species of jellyfish and their population outbreaks if they exist in the respective area.

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