jellyfish | information, habitat , life cycle ,how jellyfish swim? , how do jellyfish catch prey ?

CHARACTERISTICS AND HABITAT -:

jellyfish are found in every ocean in the world from deep to the surface of the sea. true jellyfish(Scyphozoa) are marine, but some are found in freshwater.

jellyfish belongs to a big group of animals called cnidarians. there are more than 10,000 species of cnidarians, so cnidarians are considered to be the most common type of marine animals. along with jellyfish cnidarians included corals, hydras, sea anemones, sea fans, freshwater hydras.

STRUCTURE-:
the smallest jellyfish may only reach about the size of a human thumbnail. the largest jellyfish in the world, the lion mane jellyfish may reach a size of 7 feet or 121 cm across with tentacle 121 feet or 3688cm long.

jellyfishes are invertebrates that mean they do not have a backbone. in fact, jellyfish have no brain at all!

jellyfish do not have a brain, heart, bones, and eyes. unlike fish, jellyfish have no gills. instead, they absorb oxygen through their jellylike skin. the top of the jellyfish known as a bell and their jellylike bodies are made almost of water- 95%.depending on the species of jellyfish, they may also have long tentacles. some jellyfish have light sensors called eyespots. that can help them to sense light and also help to which way is up. some jellyfish are bioluminescent which means that jellyfish can makes light from their body, kind of like a firefly.

however, no one knows the reason behind they light up scientists believe it to be a mechanism for defense, to startle a predator away, or perhaps to attract another predator to eat their attacker. jellyfish are largely transparent which means that you can see through them. this feature makes them difficult to see in the water which helps them to hide from predators.sea turtle, sharks, swordfish and even another jellyfish would like to eat jellyfish

HOW JELLYFISH SWIM?

jellyfish also swim with the help of their jellylike skin. they open their jellylike skin like an umbrella and then close it. by opening and closing their skin. the inside water rushed out of the body of and they move forward. constantly moving is the only thing keeping jellyfish afloat, but even with these efforts jellyfish can be easily pushed by sea current and wind allowing some jellyfish to reach the beach.

HOW DO JELLYFISH CATCH PREY?

jellyfish are carnivores themselves, but they do not hunt their prey. they wait for their prey(fish, small animals) to get caught in their tentacles. the tentacles are covered in stinging cells which inject venom into their prey and paralyzing it.

jellyfish can also sting humans and while some jellyfish stings are just painful. some may be dangerous for us. Although some types of jellyfish are harmless, others are dangerous predators that can prove painful or even deadly to those who try too close.

LIFE CYCLE OF JELLYFISH.

jellyfish have a complex and interesting life cycle. normally, jellyfish begin as eggs floating in the ocean currents. each egg will then grow/ develop into a planula; a swimming larva form. after a specific time, the planula will find something firmly/sturdy to attach itself to and undergo a transformation into a polyp. polyps look a bit like an underwater flower. using their tentacles to catch and eat plankton. eventually, the polyps begin to bud splitting off into ephyra / immature jelly then develops into a medusa from we usually recognize as a jellyfish. a mature jellyfish normally only lives up to about 12 months.