Jellyfish are floating animals that eat the fishes in the sea. Only a few species of jellyfish can be seen in fresh water. They are soft bodied animals that have long, stinging, and poisonous tentacles that are used to catch the fish. Jellyfish is made up of 98% of water.
There are many types of jellyfish and the size of the jelly fish also ranges from a few inches to the lion mane. Some jellyfish have the ability to glow in the dark.
The deadliest jellyfishes that can even kill a man are box jelly, Irukandji jelly, etc.
The life cycle of the jelly fish is quite dissimilar from the others.
The egg and the sperm are released in to the water by the adults and they meet in the water.
Then the Planula larva develops. It is a free swimming state.
Then it develops into a Polyp which settles on a hard surface and anchors itself and grows fully in the winter season.
Then the polyp hydroid colony forms which is linked by the feeding tubes. During the spring season the polyps bud off the tiny jellyfish.
Which grows into an adult having hood, oral arms, mouth and tentacles?
The body of the jellyfish comprises of six basic parts:
- Epidermis to protect the inner organs
- Gastrodermis – the inner layer
- Mesoglea – the area between the epidermis and gastrodermis
- Gastrovascular cavity – functions as a gullet, stomach and intestine.
- Orifice – functions as a mouth and anus
- Tentacles
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