Jellyfish

Dinara Godage Period 8 5/16/16

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Habitat

A majority of jellyfish live in the salty oceans of: Antarctica, America, Africa, Australia, and France. Some do live in rivers and lakes, or in any freshwater area. Usually jellyfish live at surface of the water. However some species of jellyfish live in the very depths of the ocean(Lauren Tarshis).

Movement

Jellyfish move around in the water by opening and closing their thin body wall, like a plunger. Along with opening their body, their tentacles glide with the movement. Jellyfish are able to find a rhythm as they move so they can move faster through the water. Most jellyfish move slowly but in certain circumstances they need to go fast(L. K. Lerner and B. W. Lerner).
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Body Covering

Jellyfish have tentacles that are covered in sting-cells. Tentacles can vary from jellyfish to jellyfish, some are long and slender while others are short and large. Their second defensive body feature is their oral arms. They are also covered in sting cells for attacking purposes. Also their bodies are covered in a jelly-like material, mesogloea, that is extremely thin. Jellyfish have only two layers of mesogloea. Jellyfish have a mouth that hangs from the top of the mesogloea(Lynn Brunelle).
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Diet

Jellyfish eat small animals, such as brine shrimp and zoo-plankton. They get their food by staying still, which makes themselves sink down. As they sink small animals get stung and paralyzed. Once the prey is paralyzed the jellyfish can move it's food into it's mouth without trouble(K. Joseph Brennan).

Reproduction

Adult jellyfish reproduce sexually and internally. The jellyfish go through a cycle before becoming an adult. First, a male jellyfish must send out its sperms. The sperms go into the female's central oral cavity to fertilize the eggs. The eggs, that have drifted out of the female, become larva over a period of about 6 days. These larva sink to the floor of the ocean and settle themselves into the sand, coral, and dirt. Next they grow into a polyp, these polyps reproduce multiple medusas(jellyfish) asexually, the polyp grows tentacles out of the top of itself. The jellyfish then forms upside down in the polyp. Lastly, the young jellyfish will emerge out of the polyp and search for food. After all these stages, they will become an adult jellyfish(Robert S. Prezant).

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Adaptations

Jellyfish have adapted by being born with "stinging cells that explode when touched ..." (Robert S. Prezant) so that they could get their food easier. Also they have found ways to hide or attack their predators, turtles and fish. Such as using both their tentacles and oral arms to attack their predators.

Other Info

  • Nicknames/Species: Medusa, Sea Nettles, Sea Wasps, and Box Jellyfish
  • Some swim in shoals
  • "Range in size from microscopic to about 7 feet"(Robert S. Prezant).
  • Some have tentacles longer than 100 feet long
  • "Classyfied as cnidarian"(Robert S. Prezant)
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Works Cited

Brennan, Joseph K. Jellyfish and Other Stingers. Chicago: Scott Fetzer Company, 2001. Print. Animals of the World.

Brunelle, Lynn. “No Bones about It.” National Geographic Explorer Sept. 2012: 8+. SIRS Discoverer. Web. 15 May 2016. <http://discoverer.prod.sirs.com/discoweb/disco/do/article?urn=urn%3Asirs%3AUS%3BARTICLE%3BART%3B0000346542>.

“The Common Sand Flea Is an Amphipod.” SIRS Discoverer. N.p., 1 Aug. 2011. Web. 12 May 2016.

Lerner, K. Lee, and Brenda Wilmoth Lerner. “Jellyfish Swimming Offshore Cape Hatteras in the Atlantic Ocean.” Research in Context. N.p., 2008. Web. 11 May 2016. <http://go.galegroup.com/ps/retrieve.do?sort=RELEVANCE&docType=Photograph&tabID=Images&prodId=MSIC&searchId=R1&resultListType=RESULT_LIST&searchType=BasicSearchForm&contentSegment=&currentPosition=3&searchResultsType=SingleTab&inPS=true&userGroupName=auro18260&docId=GALE%7CCV2210078480&contentSet=GALE%7CCV2210078480>.

Means, D. Bruce. “Turtle.” World Book. N.p.: n.p., n.d. N. pag. World Book Advanced. Web. 15 May 2016. <http://www.worldbookonline.com/advanced/article?id=ar571480&st=turtles#tab=homepage>.

Montgomery, Sy. “The World of Jellyfish.” Animals July-Aug. 1995: 8-12. SIRS Discoverer. Web. 10 May 2016. <http://discoverer.prod.sirs.com/discoweb/disco/do/article?urn=urn%3Asirs%3AUS%3BARTICLE%3BART%3B0000026380>.

Prezant, Robert S. “Jellyfish.” World Book. N.p.: n.p., n.d. N. pag. World Book Advanced. Web. 15 May 2016. <http://www.worldbookonline.com/advanced/article?id=ar287200&st=polyps#tab=homepage>.

- - -. “Jellyfish.” The World Book Encyclopedia. Vol. 11. Chicago: Scott Fetzer company, 2011. N. pag. Print.

“School of Fish.” World Book. N.p.: n.p., n.d. N. pag. World Book Advanced. Web. 15 May 2016. <http://www.worldbookonline.com/advanced/media?id=pc368622&st=fish+in+schools>.

Trashis, Lauren. “The World’s Deadliest Creature.” Scholastic Inc. 12 Dec. 2011: n. pag. SIRS Discoverer. Web. 10 May 2016. <http://discoverer.prod.sirs.com/discoweb/disco/do/article?urn=urn%3Asirs%3AUS%3BARTICLE%3BART%3B0000337366#>.