Jellyfish and jellyfish are not the same thing. Jellyfish are important large plankton in the ocean, and jellyfish are very short-lived, averaging only a few months of life. Jellyfish are invertebrates, a member of the phylum Coelenterata, jellyfish appeared earlier than the dinosaurs. Dating back to 650 million years ago, there are many species of jellyfish, about 250 or so around the world, with diameters ranging from 10 centimeters to 100 centimeters, and are commonly found in oceans everywhere.

Jellyfish cavernous, umbrella bulge in the shape of a bun, up to 50 centimeters in diameter up to one meter Gelatinous hard usually greenish blue. Tentacles milky white, mouth and wrist eight, split into many flaps, widely distributed in China's north and south of the sea. Can be eaten , and can be used as medicine.

The main component of the jellyfish body is water, and by the inner and outer two embryonic layer is composed of, between the two layers there is a very thick gelatinous layer, not only transparent, but also has a floating effect. They are in motion, the use of the body of the water jet reflex forward, like a top of the round umbrella in the water quickly drifting.

Jellyfish are classified in the genus Jellyfish under the family Jellyfishidae in the order Jellyfish, which refers to a wider range than jellyfish. Jellyfish are only one species in the larger group of jellyfish. Jellyfish umbrella bulge in the shape of a bun, up to 50 centimeters in diameter, the largest up to about one meter five, gelatinous hard, usually greenish-blue.