Jellyfish eat different foods at different growth stages, and they don't need to eat when they are in the stage of floating wave larvae. Because they were just born at this time, they could not prey and eat. Only when they enter the stage of hydra larvae will they grow four tentacles, which are the organs they prey on, so they can start eating at this time. They will eat some smaller plankton at this time.

When they continue to grow in size and reach the stage of saucer larvae, they will grow a mouth, which is usually square. At this time, they can eat more plankton, such as ostracods and cladocera. When they grow into adults, they will develop many suction ports. At this time, they will eat some plankton and some shellfish larvae. However, jellyfish are mainly plankton-based, and other foods are only used as AIDS.

Some common plankton can be fed for cultured jellyfish, such as ostracods, amphipods, cladocera and so on. If jellyfish are cultivated in large quantities, a pond can be specially opened to cultivate plankton. This can not only ensure the freshness of food, but also avoid carrying other bacteria and parasites.