12 amazing truths about jellyfish

japan aquarium jellyfish

Visitors take a look at jellyfish during a media preview for the Epson Aqua Park Shinagawa aquarium’s re-opening in Tokyo, Japan, July 6, 2015.

Toru Hanai/Reuters.

  • Jellyfish are believed to pre-date the dinosaurs by millions of years.
  • Thousands of jellyfish have been released into space for experiments.
  • Here are 12 things you probably didn’t understand about these remarkable animals.
  • Go to Business Insider’s homepage for more stories.

As beach season gets underway, reports are currently emerging of jellyfish sightings and stings Lion’s Mane jellyfish were spotted in Dublin, Ireland; a number of beaches in Mexico’s Sinaloa state were closed after hundreds of reported stings; and numerous Portuguese man-of-wars (a jellyfish relative with a painful sting) have washed ashore in South Carolina

Although these invertebrates can be frightening, they’re likewise fascinating and improperly understood.

Jellyfish do not have brains, hearts, or eyes, and they have actually been around for over 500 million years of history– today’s jellies are incredibly comparable to their prehistoric forefathers.

Here are 12 surprising facts you probably didn’t learn about jellyfish.

One kind of jellyfish can eliminate a fully grown human.

Curtis Cuba, a lifeguard in Hawaii, holds up two box jelly fish on Waikiki Beach, July 22,2003 The dripping capsules can cause a scratchy, stinging rash when in contact with skin, even after the jellyfish passes away.

Lucy Pemoni/Reuters.

The box jellyfish is believed to be the most venomous marine animal worldwide It has a cube-shaped body and is generally discovered in waters around Australia and the Indo-Pacific. Its tentacles are covered in poison-filled darts. Just a couple of types of box jellyfish have venom that’s deadly for human beings, however an individual who gets stung by one of these jellies can go into heart attack or pass away within minutes.

Jellyfish are almost totally consisted of water.

Jellyfish swim in a fish tank at Palma aquarium in Palma de Mallorca on the Spanish island of Mallorca, July 16, 2007.

Dani Cardona/Reuters.

About 5%percent of jellyfish bodies are made of structural proteins, muscles, and afferent neuron, while the remaining 95% is water. Bodies, by comparison, are as much as 60%water

A group of jellyfish can go by 3 different names.

Young visitors stand in front of jellyfish at Chimelong Ocean Kingdom in Zhuhai, China, September 4, 2018.

Bobby Yip/Reuters.

Groups of animals typically have their own names: A group of cows is a herd, for instance, while lots of fish swimming together are a school. Jellyfish groups can pass three different names. A collection of jellyfish are called a “flower,” “smack,” or “swarm.”

Urinating on a jellyfish sting won’t alleviate pain.

Swimmer Diana Nyad reveals Portuguese Man-of-War jellyfish stings in Key West, Florida, September 25, 2011.

Swimmer Diana Nyad reveals Portuguese Man-of-War jellyfish stings in Key West, Florida, September 25,2011

It’s a common misconception that if an individual is stung by a jellyfish, another individual needs to urinate on the sting to alleviate pain. But that’s merely not real. According to the Mayo Center, if you find yourself stung by a jellyfish, your best course of action is to get rid of any tentacles carefully with tweezers and soak the sting in hot water. Of, if an individual gets an extreme response or ends up being unconscious after a sting, seek medical attention immediately.

Jellyfish aren’t fish at all.

Japanese Sea Nettles are seen throughout the preview for “The Jellies Experience” exhibition at the Monterey Bay Aquarium in Monterey, California, March 30, 2012.

Richard Green/Reuters.

Despite their name, jellyfish aren’t truly a type of fish. Fish are vertebrates that live in water and breathe through their gills. Jellyfish, on the other hand, are invertebrates, meaning they have no backbone and they take in oxygen from water through membranes.

Over 60,000 jellyfish have been in area.

Visitors look at jellyfish throughout a media preview for the Epson Aqua Park Shinagawa aquarium’s re-opening in Tokyo, Japan, July 6, 2015.

Toru Hanai/Reuters.

In 1991, over 2,000 jellyfish polyps were blasted into space to check how they reacted to the lack of gravity. Those jellyfish recreated in area, producing over 60,000 jellies, but the space-bred jellies weren’t able to operate properly when they returned to Earth.

There are over 25 kinds of edible jellyfish.

David Jeffrey Morgan/ Shutterstock

Jellyfish can be a special– there are over 25 edible types of jellyfish. They’re generally found in salads or marinaded, and some people say they have salted taste and a comparable consistency to noodles.

One type of jellyfish is believed to be never-ceasing.

A tourist takes a photo of jellyfishes swimming in an aquarium of the Oceanographic Museum of Monaco, March 22,2019 (Turritopsis dohrnii disappointed.)

Eric Gaillard/Reuters.

The Turritopsis dohrnii jellyfish is believed to be immortal, given that it can transform back into a nest of polyps (private organisms). As the jelly ages, it eventually settles onto the sea floor and becomes polyps. The polyps then spawn brand-new, genetically similar jellyfish.

If a Turritopsis dohrnii gets physically hurt or begins to starve, it can transform back into a polyp at will– then in turn produce new, genetically similar jellyfish.


Jellyfish can be found in all ocean waters.

Jellyfish fall from a filter into a container at Orot Rabin coal-fired power station in Israel, July 5,2011 The power station uses seawater for cooling functions and needs to filter out and deal with heaps of jellyfish that are drawn into its system daily.

Ronen Zvulun/Reuters.

Since jellyfish tend to simply follow the currents of the ocean, they can be found around the world in every kind of ocean water They can prosper in warm tropical water or cold Arctic water. They have actually been found at the bottom of the ocean and near the surface

A 505- million-year-old fossil recommends jellyfish pre-date dinosaurs.

White-spotted jellyfish are envisioned throughout the annual stock in Hagenbeck’s zoo in Hamburg, Germany on December 29, 2014.

Fabian Bimmer/Reuters.

Considering that jellyfish don’t have any bones, fossils of ancient jellies are challenging to find. But in 2007, a maintained jellyfish fossil was discovered in Utah that’s believed to be over 505 million years of ages. Dinosaurs lived from about 245 million to 66 million years ago, suggesting jellyfish pre-date them by at least 250 million years.

Jellyfish eat other sea creatures.

Jellyfish have a surprising diet.

Jim G/Flickr

Jellyfish usually eat small plants, shrimp, or fish they utilize their tentacles to stun prey prior to consuming it.

Some jellyfish are bioluminescent.

A jellyfish swims off the island of Salamina, Greece, August 23, 2018.

Stelios Misinas/Reuters.

Bioluminescence is the term for a creature’s ability to produce its own light. Some jellyfish have this and produce an internal glow.



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