The number of dangerous purple jellyfish are now in relative decline as there have not been any recent reports of dense congregations, researchers at the Hellenic Center for Marine Research (ELKETHE) have said. Tentacles of purple jellyfish that can reach up to 2 meters, carry a very painful sting and have proliferated in several parts … The post Purple jellyfish numbers in relative decline, say Greek researchers appeared first on Keep Talking Greece.