Are JellyFish Dangerous?

Jellyfish are among the strangest sea creatures because they are almost entirely made of jelly. They do not look like fish and they are not related to them at all.

They protect themselves with a sting that is unpleasant and can sometimes be very dangerous. Jellyfish are shaped  like an overturned  bowl. The digestive system is under the bowl.

The digestive track end is a tube which hangs down from the center and has a mouth at the lower end. Tentacles, hanging from the edge of the bowl, gather food and are sometimes used for swimming. Between tentacles are nerve centers and sense organs.

The bowel of jellyfish is made up of two thin layers of tissue with jelly-like material between them. If a jellyfish is removed from the water it dries up very quickly because 98 per cent of the body is water. Of course, if the jellyfish  exist with a bowl of nearly 4 meters in diameter and with tentacles more than 30 meters long.

When a jellyfish like this “embraces” you, it may make it hard for you breathe and even partially paralyse you. The portuguese man of war, which is one of the largest jellyfish, can kill and eat full-sized mackerel. It can cause serious injury to human beings.
There is a kind of jellyfish found off the coast of Australia called “the sea wasp”, which has been known to cause death in many cases. 

What makes the jellyfish dangerous are the tentacles. Some of them are barbed and pierce the body of its prey. The barbed cells are connected to poison glands which kill or paralyse they prey.  

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