Tell some amazing facts about Jellyfish ?

Another jellyfish-derived product takes advantage of the jellies' fluorescent protein, and could be used to power medical devices in the future.

In the past decade, jellyfish blooms have been responsible for shutting down several nuclear reactors, which often rely on ocean water intakes. The jellyfish swarms can clog the intake pipes, forcing facilities to stop operating temporarily.

Jellyfish might take over the ocean
You may have heard that jellyfish are taking over the world's oceans. However, there's actually a good deal of debate about this issue among scientists.

Jellyfish first appeared about 650 million years ago and are found in every ocean, from the surface to the deep sea. Some are also found in fresh water

Medusa (plural medusae) is another word for jellyfish. Medusa is also the word for jellyfish in: Greek, Finnish, Portuguese, Romanian, Hebrew, Serbian, Croatian, Spanish, French, Italian, Hungarian, Polish, Czech, Slovak, Russian and Bulgarian

Since jellyfish are not actually fish, some people consider the term jellyfish a misnomer, and American public aquariums have popularized use of the terms jellies or sea jellies instead

Jellyfish do not have a respiratory system since their skin is thin enough that the body is oxygenated by diffusion

Jellyfish do not have a brain or central nervous system, but rather have a loose network of nerves, located in the epidermis, which is called a “nerve net.”

Jellyfish are composed of more than 90% water. Most of their umbrella mass is a gelatinous material (the jelly) called mesoglea, which is surrounded by two layers of cells which forms the umbrella (top surface). The subumbrella (bottom surface) of the body is known as the bell

Jellyfish are dioecious; that is, they are either male or female. In most cases, to reproduce, both males and females release sperm and eggs into the surrounding water, where the (unprotected) eggs are fertilized and mature into new organisms

Box jellyfish venom is the most deadly in the animal kingdon and has caused at least 5,568 recorded deaths since 1954. Each tentacle has about 500,000 sindasites which are harpoon shaped needles that inject venom into the victim

The lion’s mane jellyfish is the largest known species of jellyfish. The Arctic Lion’s mane jellyfish is one of the longest known animals and the largest recorded specimen had a bell (body) with a diameter of 2.3 m (7 feet 6 inches) and the tentacles reached 36.5 m (120 feet). It was found washed up on the shore of Massachusetts Bay in 1870

Jellyfish are found in every ocean, from the surface to the deep sea. They are even found in some freshwater lakes and ponds.

Most jellyfish are found in warm, shallow coastal waters, but there are a few species that live in the cold depths of 30,000 feet.

There are over 200 species of Scyphozoa (sometimes called true jellyfish, though they are no more truly jellyfish than the others), about 50 species of Staurozoa (stalked jellyfish), about 20 species of Cubozoa (box jellyfish), and the Hydrozoa includes about 1000–1500 species that produce medusae (there are many more hydrozoan species that do not produce medusae).

The lion’s mane jellyfish (Cyanea capillata), also known as the giant jellyfish or the hair jelly, is the largest known species of jellyfish. The largest recorded specimen found, washed up on the shore of Massachusetts Bay in 1870, had a bell with a diameter of 2.3 metres (7 ft 6 in) and tentacles 37.0 meters (121.4 feet) long; At 37.0 meters (121.4 feet) it was longer than a blue whale and is considered one of the longest known animals in the world.

jellyfish have bioluminescent organs, which emit light. This light may help them in a number of different ways, like attracting prey or distracting predators.