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Jellyfish or jellies are softbodied, free-swimming aquatic animals with a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate to acquire propulsion and locomotion. The tentacles may be utilized to capture prey or defend against predators by emitting toxins in a painful sting. Jellyfish species are. Most jellyfish have a bell-shaped body and long tentacles at the underside of the body. Tentacles are long "arms" with special stinging cells called nematocysts. They move by contracting their bodies, but they do not have much control over where they go: most of the time, they drift with the water current. The largest type of. Jellyfish have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. The jellylike creatures pulse along on ocean currents and are abundant in cold and warm ocean water, in deep water, and along coastlines. But despite their name, jellyfish aren't actually fish—they're invertebrates.

As the world's oceans are degraded, will they be dominated by jellyfish?. Noun[edit]. jellyfish (countable and uncountable, plural jellyfish or jellyfishes). An almost transparent aquatic animal; any one of the acalephs, especially one of the larger species, having a jellylike appearance. A cnidarian, a member of the phylum Cnidaria. A scyphozoan, a member of the class Scyphozoa (the true jellies). What causes jellyfish blooms? Scientists do not know the ultimate causes. The increase in the temperature of the water due to climatic change, the reduction in the number of predators due to over-fishing and the increase in nutrients due to contamination of the coasts may be some of the reasons. What are jellyfish? Jellyfish.

Nothing ruins a day at the beach faster than a jellyfish sting. The animal's venomous tentacles can stick to arms and legs, delivering burning pain to a large swath of skin. In severe cases, the stings can be life-threatening. And yet, the most common first-aid guidelines not only fail to ease the pain, they can even make the.


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