Some species of jellyfish use a form of jet propulsion to swim and get around the sea. For instance, the jellyfish <em>Polyorchis penicillatus</em> contracts its subumbrellar swimming muscles to gain power, which it uses as mechanical energy to perform a jet cycle while swimming. Some studies in this regard have been performed, measuring even the amount of energy needed in the muscles for the jellyfish to swim.
Jelly fish belongs to the group of animals known as the coelenterates. They are an invertebrates with no eyes, brain, bones or heart and are made up of about 95% water.
Jelly fish moves through water in two ways:
Swimming by jet propulsion using a structure known as coronal muscles.
By attaching themselves to another objects that moves through water currents.
