Scientific name: silver jellyfish, alias: blue button, category: Echinococcus.

Distribution: tropical and subtropical Pacific Ocean, Atlantic Ocean and Indian Ocean, eastern Mediterranean and Arabian Sea.

Habit: It mainly feeds on plankton, copepods and crustaceans.

Appearance: the silver jellyfish is relatively small, with a diameter of about 2-4 cm. The circular body in the center of jellyfish is called "air support", which is like a small disk, hard and light, and slightly transparent. Surrounded by blue, purple or yellow tentacles similar to jellyfish, each tentacle has many stinging cells.

Features: The disk-shaped floating sac is named after it looks like a silver coin. Silver jellyfish are passive wanderers. Because it has no swimming ability, it can only float in the sea by current and wind.