Gary Bell/ Oceanwide / Jellyfish (Cyanea rosella), Spencer Gulf, South Australia, Australia

Jordi Chias / Jellyfish (Diplulmaris antarctica). Cuverville, Antarctic Peninsula, Antarctica.

SCOTLAND: The Big Picture / Jellyfish (Pelagia noctiluca) amongst plankton , Shetland Isles, Scotland.

Alex Mustard / Lion's mane jellyfish (Cyanea capillata) with feeding tentacles spread swimming in the sun in shallow water. Gulen, Norway. North East Atlantic Ocean.

Luis Quinta / Moon jellyfish (Aurelia aurita) near the surface, Santa Maria Island, Azores, September.

Aflo / Northern sea nettle (Chrysaora Melanaster) floating, with Mackerel fry ( Carangidae) Izu, Japan. January.

Pascal Kobeh / Multitudes of Moon jellyfish (Aurelia labiata), Alaska, USA, Gulf of Alaska. Pacific ocean.

Richard Herrmann / Black Sea Nettle (Chrysaora achlyos), Coronado Islands, Baja California, Mexico

Richard Herrmann / Pacific Sea Nettle (Chrysaora fuscescens) group, Carmel, Monterey Bay, California

Scott Leslie / Lion's Mane (Cyanea capillata) jellyfish, Atlantic Ocean, Nova Scotia, Canada

Norbert Wu / Medusa (Desmonema glaciale) near the surface, bell can reach over one meter in diameter, Antarctica

Norbert Wu / Giant Pelagic Jellyfish (Pelagia panopyra) many animals are associated with this poisonous floating object, Monterey, California