Reproduction system of a Lion's Mane Jellyfish
By Kamala Schroeder 8A
The Lion's Mane Jelly fish is an aquatic creature which commonly lives in oceans and coastal waters in the Arctic, Atlantic and Pacific ocean. It's body (otherwise known as the bell) grows up to 1m in diameter and the tentacles can grow to 10m long! The tentacles are fine and difficult to see, this is the resemblance to the lion. As they live in the sea, larger fish, sea birds, sea turtles and other jellyfish species are predators.
Fertilization / Developement
The Jellyfish reproduce both sexually and asexually! The adult Jellyfish (otherwise known as a Medusa) grow their sex cells on the lining of the stomach. The female Medusa goes through gesturation every 48 - 55 days. One of each cell is then released out of the mouth, where it is fertilised externally in the water. Only one egg is released, so fertilisation is crucial. The fertilized egg is called a Planula (that developes viviparity), which swims until it finds a hard surface such as a rock, where it turns into a Polyp. The Polyp can clone itself as many times as it wants, this being the asexual reproduction. It remains at this stage for approximatly 7 months until it's triggered by seasonal change to turn into a Strobilation Polyp. Each segment then breaks of into it's own independant larva called Ephyra which then takes 7 months to grow into an adult Medusa! Even though there is a chance that the egg may not be fertilised, i think this is a very productive way of reproducing, as the species goes through sexual and asexual reproduction, creating mass mounts of offspring at the Polyp stage.
The lifecycle of the Jellyfish
Even though the mortality rate is low for the offspring of the sexual reproduction, not much parental care is given, as the offspring then goes to create many duplicates of itself during the Polyp stage.
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