Fish move by flapping their fins or through wriggling movements of their body. In addition , they have an air bladder, which they can fill with gases when needed , These features make them lighter and they can float in the water like a submarine, Jellyfish usually drift. To move forward,they pull together their their cap and push the water downwards- a same recoil principle that is used in jet fighters and octopuses.
Most of the jellyfish have long arms, which they use for catching their prey or for defence.
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