2006-09-26 08:07:38 · 9 answers · asked by Anonymous in Pets ➔ Fish
Most jellyfish pass through two different body forms during their life cycle. The first is the polyp stage; in this phase, the jellyfish takes the form of either a sessile stalk which catches passing food, or a similar free-floating configuration. The polyp's mouth and tentacles are located anteriorly, facing upwards.
In the second stage, the jellyfish is known as a medusa. Medusae have a radially symmetric, umbrella-shaped body called a bell. The medusa's tentacles hang from the border of the bell. This is the form most people know jellyfish as.
Jellyfish are dioecious (that is, they are either male or female). In most cases, to reproduce, a male releases his sperm into the surrounding water. The sperm then swims into the mouth of the female jelly, allowing the fertilization of the ova process to begin. Moon jellies, however, use a different process: their eggs become lodged in pits on the oral arms, which form a temporary brood chamber to accommodate fertilization.
After fertilization and initial growth, a larval form, called the planula, develops from the egg. The planula larva is small and covered with cilia. It settles onto a firm surface and develops into a polyp. The polyp is cup-shaped with tentacles surrounding a single orifice, perhaps resembling a tiny sea anemone. Once the polyp begins reproducing asexually by budding, it's called a segmenting polyp, or a scyphistoma. New scyphistomae may be produced by budding or new, immature jellies called ephyra may be formed. Many jellyfish can bud off new medusae directly from the medusan stage.
http://en.wikipedia.org/wiki/Jellyfish
Prio to summer the polyp starts to shed parts of its body, each of which grow to form the swimming jellyfish stage.
http://www.reefed.edu.au/explorer/animals/marine_invertebrates/corals/jellyfish.html
jellyfish are capable of both sexual reproduction in the medusa stage and asexual reproduction in the polyp stage
http://en.wikipedia.org/wiki/Lion's_mane_jellyfish
A
2006-09-26 09:16:09 · answer #1 · answered by iceni 7 · 0⤊ 0⤋
The male jellyfish releases a sperm into the water and this matches up with an egg released by a female jellyfish. The sperm and the egg are formed in the gonad. When the sperm and the egg fuse, they make a fertilized egg. A larva or Planula then forms and this attaches to a rock or another object on the bottom of the water and this is known as a polyp. The polyp folds over on itself creating a "colony of polyps" or Strobila. Each of the polyps in the colony detach and are medusa or adult jellyfish. Most jellyfish live less then a year.
See also the book: Making Babies from Powells.com
http://www.powells.com/cgi-bin/biblio?inkey=2-0395953170-1
Synopsis:
This accessible, informative picture book describes the mating rituals and reproductive methods of a variety of animals, including flatworms, jellyfish, chameleons, and walruses. Full color.
2006-09-26 15:33:29 · answer #2 · answered by A R 2 · 0⤊ 0⤋
Did you ever wonder how Jellyfish reproduce with that squishy like body? Well now you're going to find out. Individual Jellyfish are either male or female. The eggs and sperm develop in special areas called Gonads inside the body wall. The gonads are frequently very colorful and add greatly to the beauty of the living Jellyfish. When all of the eggs and sperm are fully developed, they are released into the stomach and then through the mouth into the sea. Some of the eggs stick to the frilly mouth lips which surround the mouth of the Jellyfish. There they are fertilized by the sperm and continue to develop. As in all many-celled animals, the microscopic fertilized eggs begin a series of cell divisions which finally result in an embryo. However, the embryo does not develop directly into a baby jellyfish, but becomes a tiny, flattened creature called a Planula.
2006-09-26 15:11:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
dont listen to half these morons. they are just jokesters you went to the right place. Just read the answers and follow the best on. you have one who sounds like he knows what hes talking about
2006-09-30 11:06:55 · answer #4 · answered by furby_lost 5 · 0⤊ 0⤋
Right here, Sparky.
http://answers.yahoo.com/question/index;_ylt=AqSfWZfAWlxluiJ1Bn0YzU3sy6IX?qid=20060926082904AAgF4yV
2006-09-26 15:15:21 · answer #5 · answered by Anonymous · 0⤊ 0⤋
they don't have rituals since they don't have a brain.
2006-09-26 15:15:27 · answer #6 · answered by a1tommyL 5 · 0⤊ 0⤋
contact spongebob squarepants..
2006-09-26 15:09:35 · answer #7 · answered by Anonymous · 0⤊ 0⤋
try this site
http://oceanlink.island.net/ask/cnidaria.html#anchor143576
2006-09-26 15:13:30 · answer #8 · answered by Jess 2 · 0⤊ 0⤋
Are you for real????
Why dont you try banging one!
2006-09-26 15:08:28 · answer #9 · answered by Anonymous · 0⤊ 0⤋