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Jellyfish are not fish.
Jellyfish are made mostly of water.
Jellyfish don't have heart, brain or bones.
Jellyfish live in all of the world's oceans.
Jellyfish swim by jet propulsion. A jellyfish expands and then quickly contracts its bell-shaped body.(Like opening and closing an umbrella quickly) This movement forces water away from the bell and pushes the jellyfish in the opposite direction.
To protect themselves, some jellyfish are transparent and can hide from predators such as sea turtles.
Others have stinging cells that injects poison into anything that touches the jellyfish. The stinging cells are also used to catch prey. (animals that the jellyfish eats)
Go here for information and a diagram about the life cycle of a jellyfish.
http://www.infovisual.info/02/013_en.html
Here you watch a video about the life cycle of moon jellyfish http://www.youtube.com/watch?v=Id53jmsdxfQ
Some other facts:
Most jellyfish are not harmful to people. But, Australia’s box jelly is the most dangerous jellyfish in the world.
Jellyfish have been in the oceans for over 650 million years. That's before the dinosaurs!
In some countries, people eat jellyfish.
If you use any of this information in your own work acknowledge this source in your bibliography like this:
Thomas, R. & Sydenham,S. Jellyfish [Online] www.kidcyber.com.au (2010)
All images on this page © [2007] Jupiterimages Corporation
updated April 2010 (copyright kidcyber)