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Interesting Facts About Jellyfish

By Amy Lee

Out of the many creatures of the sea, one that really stands out is the jellyfish. This is because it is a simple yet very interesting organism with a genetic makeup worth talking about. There is even the immortal jellyfish that is named so because of its possible immortal being because it can cheat death. Keeping jellyfish as pets in jellyfish tanks is an actual possibility as long as you know some facts about them.

It is a great fact that there are about 200 jellyfish species. Examples of jellyfish species include Blue Jellies, Lion’s Mane Jellyfish which is the largest of them, Sea Nettles, Moon Jellies and many others. A true jellyfish can be found in salt and fresh water while those that are not actual jellyfish can only survive in fresh water like the Craspedacusta Sowerbii. Jellyfish have been on earth for over 650 million years, longer than the now extinct dinosaurs.

When it comes to the anatomy of a jelly fish, it is said to only have one opening which acts as the mouth. Their movement resembles a jet propulsion. Jellyfish eyes are merely 2 small dots that are sensitive to light. It is also important to note that they have no brain, blood and their bodies are made of about 95% water. This means that jellyfish tanks must always have clean water foe their very existence. This also means that their bodies merely collapse and they die if taken out of their habitat and you will not be able to look into their jellyfish eyes to notice any problem, unlike other fish.

When it comes to the care of jellyfish, you must have jellyfish tanks and the right kind of food and water if you wish to keep them alive. Their jellyfish eyes are photosensitive so it would be wiser to keep them in a shady spot. The water must be at temperatures plus/minus 2 degrees of 77 degrees. The water must be adequately freshwater or salted depending on the jellyfish you have. You will note that they will swim slower than usual if the water is not conducive.

There are times that a bubble can enter a jellyfish, gently turn it upside down and it will make its way out. Its jellyfish eyes and the rest of the body become smaller if they are hungry so it is a good idea to put just the right amount of food. Unclear water means that you put too much so do this in moderation. Jellyfish tanks must be kept clean and the water change must be the same temperature as the existing water to ensure it lives long.

Discover the wonderful kinds of jellyfish in the world. Learn more today about interesting jelly fish including some neat things about jellyfish eyes. Believe it or not, You can also grow and breed jellyfish yourself. Check out our information on jellyfish tanks.

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Article Citation
MLA Style Citation:
Lee, Amy "Interesting Facts About Jellyfish." Interesting Facts About Jellyfish. 7 Oct. 2010. 26 Nov 2014 <>.

APA Style Citation:
Lee, A (2010, October 7). Interesting Facts About Jellyfish. Retrieved November 26, 2014, from

Chicago Style Citation:
Lee, Amy "Interesting Facts About Jellyfish"

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