Jellyfish float in the sea. A jellyfish eats other fish. A jellyfish moves with its tentacles. They have bodies and long stinging tentacles. They can sting you. They are crazy. If you have been swimming with them and you get stung it would hurt. The jellyfish predators are sea turtles, and sunfish. Jellyfish have stingers. A jellyfish is 98% water.