Moon jellyfish (Aurelia aurita), Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

moon jellyfish aurelia aurita aquarium gipuzkoa basque country spain europe marine life ocean underwater jellyfish aquatic science biology exhibit creatures nature swimming color ethereal ecosystem transparency beauty habitat observation research species public display aquatic environment visitors tranquil mesmerizing life invertebrates circling currents delicate pulsing blue organisms animal behavior sea underwater world silky jelly like fluid movement swimming behavior illumination