Sue Daly / Barrel jellyfish (Rhizostoma octopus) swimming past, Sark, British Channel Islands, UK, September.

Stephane Granzotto / Jellyfish (Rhizostoma pulmo) Mediterranean sea, Corsica

Stephane Granzotto / Jellyfish (Rhizostoma pulmo) Mediterranean sea, Corsica

Stephane Granzotto / Jellyfish (Rhizostoma pulmo) Mediterranean sea, Corsica

Stephane Granzotto / Jellyfish (Rhizostoma pulmo) Mediterranean sea, Corsica

Stephane Granzotto / Jellyfish (Rhizostoma pulmo) Mediterranean sea, Corsica

Pascal Kobeh / Jellyfish (Rhizostoma sp) is the host of commensal juveniles fish looking for a protection against their predators, Sulu Sea, Philippines

Graham Eaton / Rhisostome / Barrel jellyfish (Rhizostoma octopus) stranded on a sandy beach, Abersoch, Gwynedd, Cardigan Bay, Wales, April.

Pascal Kobeh / Barrel jellyfish (Rhizostoma sp), Maldives, Indian Ocean.

Sue Daly / Barrel Jellyfish (Rhizostoma pulmo) against crepuscular light rays. Sark, British Channel Islands, July.

Sue Daly / Barrel Jellyfish (Rhizostoma pulmo) against crepuscular light rays. Sark, British Channel Islands, July.

Sue Daly / Barrel Jellyfish (Rhizostoma pulmo) Sark, British Channel Islands, July.