Fun Facts about Jellyfish

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Some jellyfish are bigger than a human and others are as small as a pinhead? … people in some countries eat jellyfish? … that jellyfish have been on Earth for millions of years, even before Dinosaurs

What is a jellyfish?

The word jellyfish is a common term used to describe animals that are gelatinous or made up of ‘jelly-like’ material. There are many different types of jellyfish, including stinging kinds called medusae and non-stinging kinds called comb jellies or ctenophores. Another type of jelly animal called a salp is even in the same group as humans!

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.

Photo: deep_onion / cc
Photo: deep_onion / cc

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.

The Turritopsis nutricula can regenerate its cells, and this feature could allow it to live forever. (Photo: Peter Schuchert/The Hydrozoa Directory)
The Turritopsis nutricula can regenerate its cells, and this feature could allow it to live forever. (Photo: Peter Schuchert/The Hydrozoa Directory)

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.

© Virginia Tech, one of the robots developed in the Navy study
© Virginia Tech, one of the robots developed in the Navy study

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.

Photo: Ben Raines
Photo: Ben Raines

There’s 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.”

CC BY 2.0 Michael Bentley
CC BY 2.0 Michael Bentley

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.

Not all jellies have tentacles

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

Some jellyfish look like trash bags.

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

CC BY 2.0
CC BY 2.0

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.

A raw caramel craze is sweeping Japan
A raw caramel craze is sweeping Japan

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.

Photo by Schristia via Flickr Creative Commons
Photo by Schristia via Flickr Creative Commons

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.

Jellyfish Anatome
Jellyfish Anatome

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.

Jellyfish don’t have brains

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

References:  www.jellywatch.org,Treehugger.com

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November 7, 2016 |

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