The main component of the jellyfish body is water, and the water content is generally more than 95%. When they are moving, they use the water spray reflex in their bodies to move forward, just like a round umbrella floating rapidly in the water.

People tend to classify jellyfish according to the different appearance characteristics of the umbrella-shaped body: some umbrella-shaped bodies emit silver light, called silver jellyfish; some umbrella-shaped bodies are like white sails on ships, called sail jellyfish; some are like umbrellas, called umbrellas. Jellyfish; some umbrellas shine with colorful rays of light, called Xia jellyfish.

1. Amakusa jellyfish

The largest diameter of Amakusa jellyfish can reach 9cm. It is distributed in some sea areas of the Indian Ocean and North Atlantic jellyfish. It preys on plankton and other jellyfish. The body of the Amakusa jellyfish is translucent, and about eight wrists protrude from the center of the umbrella body, which can be extended behind the umbrella. The small tentacles around the umbrella body are very long, some as long as 1 meter. When swimming in the water, it is like dragging a large net. When it encounters food, it will quickly curl up, hugging the food and sending it to the wrist.

2. Arctic jellyfish

The largest of the jellyfish is the Arctic jellyfish distributed in the Atlantic Ocean. Its canopy can reach 2 to 5 meters in diameter, and there are eight groups of tentacles on the lower edge of the canopy, each with about 150 tentacles. Each tentacle stretches more than 40 meters, and it can shrink the jellyfish to only one-tenth of its original length in one second. There are stinging cells on the tentacles, which can turn out the barbed wire to radiotoxin. When all the tentacles are stretched out, it is like a net covering an area of ​​500 square meters. Once any ferocious animal is thrown into the net, it will be captured.

3. Peach jellyfish

Commonly known as "Peach Blossom Fish", "Parachute Fish". Hydra jellyfish, transparent body, slightly milky white, the size of a thumb, between 0.1 cm and 1 cm in diameter, with about 256 tentacles, which can be divided into seven grades according to length. . The peach blossom jellyfish has extremely high requirements on the living environment, the water quality should not have any pollution, the living body is rare, and it is extremely difficult to make specimens.