Denise Heckman

Denise Heckman

Modified & Updated: 07 Sep 2023


If you’ve ever been captivated by the luminous beauty of jellyfish drifting gracefully in the ocean, you may already be familiar with the enchanting moon jelly. These ethereal creatures, with their translucent bodies and mesmerizing pulsating movements, have long fascinated both scientists and nature enthusiasts. In this article, we will delve into the fascinating world of moon jelly, uncovering 18 intriguing facts about these mysterious beings. From their unique appearance to their delicate feeding habits, you’ll learn everything you need to know about moon jelly and gain a deeper appreciation for the wonders of the ocean. So, let’s dive in and discover the captivating world of moon jelly together!

Table of Contents

The Moon Jelly is not actually a jellyfish.

Contrary to popular belief, the Moon Jelly is not a true jellyfish. It belongs to a different class of animals known as Scyphozoa.

Moon Jellies are found in oceans all over the world.

These beautiful creatures can be found in the waters of the Atlantic, Pacific, and Indian Oceans, as well as the Mediterranean Sea.

They have a unique transparent bell-shaped body.

The Moon Jelly’s bell-shaped body is made up of a translucent substance called mesoglea, which allows them to blend seamlessly with their surroundings.

Moon Jellies use their tentacles to capture prey.

They have long, slender tentacles that they use to sting and capture small fish and plankton as a source of food.

They have a mild sting that is not harmful to humans.

Although Moon Jellies have stinging cells, their sting is usually harmless to humans. It may cause a slight irritation or redness, but it is not considered dangerous.

Moon Jellies have a short lifespan.

On average, these jelly-like creatures live for about one year in the wild. However, some individuals have been known to live up to a few years in captivity.

They undergo a unique reproductive process called “medusae”.

Moon Jellies reproduce by releasing their eggs and sperm into the water, where they combine and form planula larvae. These larvae then attach themselves to a surface and develop into polyps before transforming into adult jellyfish.

Moon Jellies have limited control over their movements.

While they can pulse their bells to move, Moon Jellies mostly rely on ocean currents to drift and travel.

They have a beautiful bioluminescent glow.

Moon Jellies have the ability to produce a mesmerizing bioluminescent glow, which is caused by the reaction of certain proteins within their bodies.

They play an important role in marine ecosystems.

Moon Jellies serve as a crucial part of the marine food chain, providing food for various species, including sea turtles and certain types of fish.

Moon Jellies have limited defenses against predators.

Aside from their mild stinging cells, Moon Jellies have few natural defenses. They rely on their transparent bodies and the currents to evade predators.

They are capable of changing their size.

Moon Jellies can adjust their size based on environmental conditions, such as the availability of food and space.

They have a complex nervous system.

Despite their simple appearance, Moon Jellies possess a decentralized nervous system that allows them to respond to their environment.

Moon Jellies are often kept in aquariums.

Due to their otherworldly appearance, Moon Jellies are popular attractions in public aquariums, where visitors can observe their graceful movements up close.

They are a popular subject of photography and art.

Many photographers and artists are drawn to the ethereal beauty of Moon Jellies, capturing their delicate forms and vibrant colors in stunning photographs and artworks.

Moon Jellies can regenerate damaged body parts.

If a Moon Jelly loses a tentacle or part of its bell, it has the ability to regenerate the missing body part over time.

They have a pulsing motion that helps with feeding and respiration.

The rhythmic pulsations of a Moon Jelly’s bell help to propel water through their bodies, aiding in both feeding and respiration.

Moon Jellies prefer coastal waters with mild temperatures.

These fascinating creatures can often be found in coastal areas with water temperatures ranging from 59 to 77 degrees Fahrenheit (15 to 25 degrees Celsius).


In conclusion, moon jellyfish, with their ethereal appearance and interesting characteristics, are truly fascinating creatures. From their translucent bodies and gentle pulsations to their unique life cycle and symbiotic relationships, these jellyfish have captured the attention of marine enthusiasts and scientists alike. As they gracefully swim through the world’s oceans, they serve as a reminder of the incredible diversity of animal life on Earth.The moon jelly’s sting may be milder compared to other jellyfish, but it’s still important to exercise caution when encountering them in the water. Remember to respect their habitats and observe from a safe distance to avoid any potential harm. By learning more about moon jellyfish, we can deepen our understanding of marine ecosystems and appreciate the beauty and complexity of the underwater world.


1. Can moon jellyfish sting humans?

Yes, moon jellyfish have stinging cells called nematocysts, but their sting is generally mild and harmless to humans. It may cause some itching or a slight rash, but it is rare to experience severe reactions.

2. How long do moon jellyfish live?

Moon jellyfish have a relatively short lifespan, typically living for about one year in the wild. However, when kept in captivity, they have been known to live for up to three years.

3. Do moon jellyfish eat other jellyfish?

No, moon jellyfish primarily feed on plankton, small fish, and other tiny organisms. They use their tentacles to capture their prey and then transfer it to their mouths located in the center of their bodies.

4. Are moon jellyfish found in freshwater?

No, moon jellyfish are marine animals and are commonly found in coastal waters around the world. They require saltwater to survive and reproduce.

5. Can moon jellyfish change their color?

While moon jellyfish don’t have the ability to change their color like some other species, their translucent bodies can appear slightly different depending on their food source and environmental conditions.

6. Are moon jellyfish harmful to the environment?

No, moon jellyfish play a vital role in marine ecosystems. They help regulate the population of plankton and other small organisms, and they also provide a food source for larger marine species.

7. Can moon jellyfish swim against currents?

Moon jellyfish have limited swimming abilities and are often at the mercy of ocean currents. They can, however, pulse their bell-shaped bodies to maneuver within the water to some extent.

8. Do moon jellyfish have predators?

Yes, moon jellyfish have several natural predators, including sea turtles, larger fish, and certain species of birds. These predators can feed on the moon jellyfish without being affected by their mild sting.

9. Can moon jellyfish live in captivity?

Yes, moon jellyfish can be successfully kept in captivity under controlled conditions. Specialized aquariums or jellyfish tanks with appropriate water filtration and temperature settings are necessary to ensure their well-being.

10. How do moon jellyfish reproduce?

Moon jellyfish undergo both sexual reproduction and asexual reproduction. During sexual reproduction, males release sperm into the water, which is captured by the females. The fertilized eggs develop into larvae, which eventually settle on a suitable surface and grow into adult jellyfish. Asexual reproduction can occur through a process called budding, where small polyps develop into new medusae.