14 Fascinating Facts About Jellyfish

Written by Margaret Badore

Jellyfish and jelly-like sea creatures come in an immensely diverse range of forms. Animals that are typically called jellyfish belong to the phylum Cnidaria, which includes over 10,000 species. However, some jelly-like animals, like the comb jelly, belong to the phylum Ctenophora. This taxonomic difficulty has lead marine biologists to ask if there’s even such a thing as a jellyfish.

Let’s set those questions aside for now, and dive together into the fascinating world of creatures commonly known as jellyfish.

1. Some jellyfish can glow in the dark

Many jellyfish have bioluminescent organs, which emit light. This light may help them in a number of different ways, like attracting prey or distracting predators.

2. Jellyfish can clone themselves

If a jellyfish is cut in two, the pieces of the jellyfish can regenerate and create two new organisms. Similarly, if a jellyfish is injured, it may clone itself and potentially produce hundreds of offspring.

3. Some jellyfish are immortal

There are two phases to jelly life: the stationary polyp stage and the mobile medusa phase. It’s the medusa phase that we’re usually referring to when we talk about jellyfish. Typically, jellies start as polyps and develop into medusas, but the Turritopsis nutricula has earned it the nickname “the immortal jellyfish” for having the ability to travel backward to the polyp stage in times of stress.

NOAA/Public Domain

4. Jellyfish can teach us about efficient underwater propulsion

The movements of bell-shaped jellyfish have provided researchers with a new understanding of propulsion. The flexibility of their umbrella-like bodies allow them to pulse upwards and downwards without expending much energy. Researchers have created biomimetic robots with flexible bells, which may one day lead to better undersea vehicles.

5. Not all jellies have tentacles

The scyphomedusa deepstaria, shown in the video below, doesn’t need tentacles to trap its prey.

6. Theres a giant jellyfish called the pink meanie

The scientific name for this jelly is Drymonema larsoni, but its aggressive sting and distinctive color have earned it the nickname “pink meanie.”

7. Jellyfish dont have brains

Instead, jellyfish have nerve nets which sense changes in the environment and coordinate the animal’s responses.

Jaro Nemčok/CC BY-NC 3.0

8. Jellyfish movements inspired a new way to fly

It’s probably not that surprising that jellyfish have served as inspiration for swimming robots. However, it’s more unusual to see a sea creature inspire a flying machine, but that’s just what happened at New York University.

9. Jellyfish powder has been used to make salted caramel

Turtles eat jellyfish, and larger jellies may eat smaller ones, but are jellyfish fit for human consumption? A group of high school students in Japan came up with a salted caramel recipe that uses powered jellyfish. It’s not vegan for sure, but it is one way to deal with an invasive jellyfish bloom.

10. Glowing jellyfish goo could power medical devices

Another jellyfish-derived product takes advantage of the jellies’ fluorescent protein, and could be used to power medical devices in the future.

11. Jellyfish are surprisingly good at shutting down nuclear reactors

In the past decade, jellyfish blooms have been responsible for shutting down several nuclear reactors, which often rely on ocean water intakes. The jellyfish swarms can clog the intake pipes, forcing facilities to stop operating temporarily.

Nubobo/CC BY 2.0

12. Jellyfish will eat peanut butter

Peanut butter jellyfish! Need I say more?

Ok, I will: two Aquarists in Dallas, Texas created a saltwater/peanut butter mix and fed it to moon jellies. Apparently, the jellies found this mix to be an acceptable source of protein. “We would love to claim we conducted this trial with noble purpose, but the truth is that we just wanted to make peanut butter and jellyfish simply to see if it could be done,” the researchers write.

13. Some jellyfish look like trash bags.

They’re known as Deepstaria enigmatica, and are usually found in the Arctic seas.

14. Jellyfish might take over the ocean

You may have heard that jellyfish are taking over the world’s oceans. However, there’s actually a good deal of debate about this issue among scientists.

Still want to know more? I recommend JellyBiologist, the excellent blog by researcher Rebecca Helm.

This post originally appeared on TreeHugger

Photo Credit: Henry Kaiser, National Science Foundation

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Jim Ven
Jim Ven3 months ago

thanks for the article.

Carrie-Anne Brown
Carrie-Anne Brown9 months ago

thanks for sharing :)

Sonia Minwer Barakat Requ

Very interesting article,thanks for sharing

Oleg Kobetz
Oleg Kobetz1 years ago


Tom Sullivan
Tom C Sullivan1 years ago

You forgot to mention they hurt like hell when stung.

Leanne B.
Leanne B.1 years ago

Very interesting thanks.

Lynn C.
Lynn C.1 years ago

These were interesting - thanks

Borg Drone
Borg Drone1 years ago

Brilliant, Thanks for this.

Tina Hawkins
Trina Hawkins1 years ago

To watch these Jellyfish Float/Swim is Mezmerizing ,they seem so Delicate,even though some are Deadly ! I'm Amazed at Nature,and all the Wonders Big and Small that are still unseen by us,the ocean is Full of Beautiful Creatures ! I just Hope that We as humans can leave these creatures alone to Live as they should ! Thanks for this interesting story ! :)

Steven Gregory Davis

Very informative and interesting...Peanut Butter and JellyFish anyone???...Yum Yum!!!