Jellyfish – are jelly-like creatures that may be found mainly in water both warm and cold water. They are commonly found in coastal zones across the world.  Many jellyfish are clear and some are vibrant colors of purple, yellow, blue, and pink. Jellyfish may be bioluminescent so they produce their own light. As per a study, Jellyfish are one of the oldest creatures of Earth for about 700 million years ago such as comb jellies as they are older than sharks (450 million years ago) and trees (385 million years ago). But as per research, the fossil dates of jellyfish is about 500 million years before dinosaurs lived on the Earth.

Most of the types of jellyfish may produce bioluminescence or own light that makes them glow in the dark. Thus, jellyfish are more visible in the deep oceans with their different colors such as blue, yellow, red, and violet. The main use of bioluminescence or light is for self-defence by confusing predators in the ocean and sea. Jellyfish also use this light to attract and prey small fish and crabs for their food. Mostly, jellyfish are free-swimming marine animals with trailing tentacles and umbrella-shaped bells. This marine animal is found from surface waters to the deep sea across the world. Jellyfish eat plankton which are small organisms that float in the sea and ocean water. Several marine animals including seabirds, fish, and turtles eat jellyfish. Jellyfish may help in maintaining the ocean clean or healthy by removing waste products from the water. They are also beneficial in controlling or maintaining the population of marine animals in the sea and ocean.

Impressive facts about jellyfish – There are several important facts about jellyfish are given below –

1. Jellyfish are not a fish and they are really a type of invertebrate called as cnidarian, which is closely related to sea anemones and corals.
2. Jellyfish are jelly-like creatures, which may be found mainly in both warm and cold water and they are also commonly found in coastal zones across the world.
3. As per a study, Jellyfish are one of the oldest creatures of Earth for about 700 millions years ago such as comb jellies as they are older then sharks (450 million years ago) and trees (385 millions years ago). But as per research, the fossil dates of Jellyfish is about 500 millions years before dinosaurs lived on the Earth
4. Jellyfish have no blood, heart, eyes, brain, and bones.
5. Jellyfish can be bioluminescent so they produce their own light for self-defence and prey on small fishes and crabs for their food.
6. The life span of some jellyfish is about 12 to 18 months and several others live only for around three months to a year.
7. Jellyfish are made up of bag-like, smooth bodies and tentacles armed with tiny cells.
8. Box jellyfish have 24 eyes and their eyes are bundled into four groups in which two of the eye types may form images and the other two types perform easy task like avoiding obstacles and reply or responding to light. These eyes are placed at every corner of their bell-like body.
9. The mouth of jellyfish is found or placed in the centre of the body.
10. Mostly, jellyfish are free-swimming marine animals with trailing tentacles and umbrella-shaped bells.
11. Jellyfish are available in each ocean and every corner of Earth such as the temperate and warm water of the tropic oceans and also found in the coldest water of the Arctic Ocean.
12. Jellyfish eat crabs, tiny plants, shrimp, larvae, and small fish and digest their food very fast
13. Jellyfish may help to keep the ocean clean or healthy by removing waste products from the water.
14. Jellyfish may swim fast as 1.5 to 2 meters per second
15. Many jellyfish are clear and several others are available or found in different colors such as purple, yellow, blue, and pink.
16. Lion’s mane jellyfish is one of the giant jellyfish across the world.
17. Marine animals including sea turtles and seabirds eat jellyfish
18. Irukandji jellyfish is the smallest types or species of jellyfish and is mainly found in the Northern Australia.
19. Box jellyfish are very poisonous due to their tentacles are covered by poison.
20. Jellyfish look like squishy and appear just like a water droplet or blob because jellies are 95 percent water. They do not have heart, blood, and brain.
21. Different types of jellyfish are suitable for food which may be used as ingredients to make different dishes.
22. Crystal jellyfish are found in the western part of North America and is one of the largest types of jellyfish.
23. Medusa is the adult stage of jellyfish that reproduce sexually by spawning sperm cells and eggs which are deposited into the water. Male and female jellies release their sperm cells and eggs through their mouths.
24. Jellyfish are found from surface waters to the deep sea across the world.
25. Jellyfish are beneficial in controlling or maintaining the population of marine animals in the sea and ocean.
26. Jellyfish are made up of about 95 percent water with simple body structure and no bones, brain, and heart.
27. Jellyfish are jellylike, and bell-shaped invertebrates with stinging tentacles which capture food.
28. Jellyfish are also eaten by human beings in certain or many cultures and are considered a delicacy in several Asian countries.