Brown Jellyfish in Sunshine City (Tokyo, Japan) (by Shanti Basauri)
Chrysaora melanaster's ellegance in Sunshine City, Ikekuburo
Just 5 millimetres wide, the tiny Turritopsis dohrnii has discovered how to cheat death. More commonly known as the immortal jellyfish, it has been silently invading oceans all over the world with its ever-increasing population—due to the fact it can age backwards. The jellyfish’s reproduction cycle involves the meeting of free-floating sperm and eggs, which then settle on a hard surface and form a blob-like polyp, which slowly matures. Most mature jellyfish species die soon after reproducing, but the Turritopsis is able to transform from back into a polyp and restart life anew, inverting their ‘umbrella’ and absorbing their tentacles. This can only be done in an emergency such as starvation, physical damage, or temperature or salinity change, but the cycle can be repeated indefinitely, rendering the Turritopsis immortal. Remarkably, their cells are completely transformed in the process. Biologist Stefano Piraino thinks that they’re able to “switch off some genes and switch on [others], reactivating genetic programs that were used in earlier stages of the life cycle.” However, researchers have dismissed ideas that the species could hold the key to anti-aging drugs—and maybe that’s for the best. If the Turritopsis can spread this rapidly through the world’s oceans, then I don’t think immortality would very healthy for humans.
The jellyfish Atolla lives worldwide in the deep sea, where light levels are very low. The jellyfish is bioluminescent — emitting blue-green light — and so are most of its prey. Scientists think that the deep red color of the animal’s stomach serves a purpose — to keep the blue light of its luminescent lunch from escaping and giving away Atolla’s location to its own predators.
Photo by Larry Madin
Aurelia Aurita (moon jelly) (by isayx3)
Blue Jellyfish (by 1garysan)
Miyajima Island Aquarium, Japan
Light me a light any kind of light (by FLEECIRCUS)
Shanghai Ocean Aquarium
Jellyfish by Prem Balson
Tentacle Surplus (by sansceriph)
sea jelly; ocean park, hong kong 2011
Moon Jellyfish by macropoulos