Introduction – World Jellyfish Day is celebrated every year on November 3 across the world to raise awareness about the importance of jellyfish in the marine ecosystem, The main purpose of this international day is to promote knowledge about the different species of jellyfish and their important role in the marine ecosystem.

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. Jellyfish have existed for more than 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.

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 that are small organisms which float in the water. Several marine animals including seabirds, fish, and turtles eat jellyfish. Jellyfish may help in maintaining the ocean 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.

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

• Jellyfish have no blood, heart, eyes, brain, and bones.
• 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
• Jellyfish can be bioluminescent so they produce their own light for self-defence and prey on small fishes and crabs for their food.
• Jellyfish are made up of bag-like, smooth bodies and tentacles armed with tiny cells.
• Mostly, jellyfish are free-swimming marine animals with trailing tentacles and umbrella-shaped bells.
• The mouth of jellyfish is found or placed in the center of the body.
• Jellyfish have existed for more than 500 million years before dinosaurs lived on the Earth.
• Jellyfish may help in maintaining the ocean healthy by removing waste products from the water.
• Jellyfish are jelly-like creatures that may be found mainly in water both warm and cold water.