What Do Jellyfish Eat? Do Have Brains? and All about Types of it

What Do Jellyfish Eat? Jelly fish are beautiful creatures. There is 90% of water in their bodies but still they flow along with the flow of water. These creatures eat meat and mate constantly. Jelly fish have certain things which they have in common with other animals.

These are the only similarities they have but that should not refrain us from studying jelly fish. What are the eating habits of jelly fish and what is the food given to jellyfish you kept as pet? Let s try to figure out.

What Do Jellyfish Eat in the Wild

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Jellyfish have been living in the ocean from a very long time. The best thing is that they can adapt themselves in every type of water. The can also live in coastal waters that are shallow.

Jellyfish are known to depend on other animals for their food. They are very good predators. It is very surprising that how can a round thing that is mostly made of water containing 7-8 tentacles eat other animal?

Jellyfish are able to paralyse their prey by stinging it. There are cells present in the tentacles of jellyfish that attacks their food and the creature is shocked as they eat them. The top portion of the body of jellyfish is like a bell where is mouth is located.

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The mouth of jellyfish is like an opening found in mammals. After stinging its prey the jellyfish swallows the food in the opening and eats it within no time. The process of digestion has to be quick as it is not easy for the jellyfish to move around in the water with heavy food inside its body.

The waste is also taken out from this opening. Although this may sound weird to humans but the physical mechanism of jellyfish is very different from mammals which makes this process interesting.

Favourite Food of Jellyfish

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But what is that which jellyfish hunt with their deadly tentacles? The answer is living creatures that is quite small which they can catch with their tentacles.

For instance creatures like plankton, crustaceans, and eggs of fish, fish, and other jelly fish are the favourite foods of jelly fish. They even eat plants which they come across.

You should know that jellyfish are not avid hunters and will only eat what they may get. Their tentacles work just like the net of fisherman for them.

The process of swimming of jellyfish involves contraction and expansion of their bodies. When the bells of these creatures expand they get more area to track their prey.

When jellyfish are found in big groups it is called bloom. The blooms of jellyfish can be a big problem for fisherman and other creatures who frequently visit the area of bloom.

This is because the tentacles of jellyfish cover a lot of area and so they can eat everything which comes under that area. It implies that jellyfish eat the food of bigger sea creatures which limits the survival of other creatures as the bloom moves on.

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The diet of jellyfish is full of variety. They are able to eat anything that is trapped in their tentacles if it is a living creature. Jelly fish are also known to eat small creatures of the sea.

Although jellyfish do not eat everything in the ocean but they can be a big problem if they form a bloom as they can finish the food of other sea animals. Jellyfish can reduce the population of habitats of ocean in spite of the fact that they do not eat big creatures.

Best Food for Jellyfish Which is Kept in an Aquarium

What do Jellyfish eat which is Kept in an Aquarium
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The jellyfish which is kept in an aquarium leads a much different life than the jellyfish in the wild. In addition when they live in an aquarium they eat very less than a bloom can. If you have kept a jellyfish or planning to get one then you should know about the foods that can be added to your tank.

The Aquarium Food for Jelly Fish

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It is not very commonly seen that people own a jelly fish aquarium but this trend is becoming popular. The most common jellyfish which is kept by people in the aquarium is known as “moon jellyfish”. There are only two types of moon jelly fish that is found and it is not easy to get them. But if you want to keep a jellyfish you should know about its eating habits.

Feeding Your Jellies

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It is important to keep your jelly fish full otherwise they will get weak and lazy. Jellyfish are transparent and you are able to see through them. For example if your jellyfish has not consumed any food you can see the bluish colour in their bellies. After about an hour of eating food you can see the red colour of the food being digested in front of your eyes. If you are able to see the reddish colour of the food inside the jellyfish it means your jellyfish is getting the right amount of food to eat.

Do You Know The Right Food for Your Jellyfish?

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Jelly fish looks great whether they are living in an ocean or an aquarium. You may not have kept a jellyfish in an aquarium but you would certainly want to see them in an aquarium. You may not know that they even like to eat eggs of fish and small shrimp.

If in case you want to keep a jelly fish tank at home you should do a proper research in order to find a good source to get food. Jelly fish do not eat much as they are known to eat what they get.

Types of Jellyfish

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The NOAA Okeanos Explorer recently discovered a new type of Jellyfish that pertains to the Crossota gender which is pushing through the ocean. This is a very impressive, beautiful specimen, but many others will impress you with their unique appeal and distinct set of visuals, to begin with.

Cauliflower Jellyfish

Cauliflower jellyfish
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A thing to note here is that this particular type of jellyfish is named based on the bell projections that will remind you of the cauliflower plant. You can find it in the West Africa region, as well as the Atlantic Ocean, Indo and Mid-Pacific.

This is a rather large jellyfish species, as it can reach diameters of around 1.5-1.9 feet. They are known as a delicacy in some regions like Japan and China. However some people do use them for medical purposes.

Crystal Jellyfish

Crystal Jellyfish
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A thing to note about this species is the fact that it’s colorless. Aside from that, it has no less than 50 different tentacles, and these tend to line near the bell which is similar to glass. It’s one of the few jellyfish species that seems clear in daylight.

Based on data from the Monterey Bay Aquarium, these are bright, and they do have some glowing points right near the globe. What leads to the bioluminescence includes things like aequorin which is a protein activated by calcium, and you will also find GFP that gets the aequorin energy and delivers a green light based on that.

The protein is helpful for scientists as it allows them to improve their research and find better results in a very simple and efficient manner.

White-spotted Jellyfish

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Although many species are rather fearful, the white spotted jellyfish isn’t one you should be afraid of. The venom isn’t bad for humans, since this species is only killing zooplankton for its survival. It can filter up to 13k gallons of water as it tries to find the zooplankton.

The issue here is that they tend to eat a lot of zooplankton to the point where crustaceans and fish will find it had to stay alive. You can find them in regions like the Caribbean sea, as well as the Gulf of Mexico as well as the Gulf of California.

Bloodybelly Comb Jellyfish

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This is a rather common name, but a distinct one at that. They do offer a very impressive light show, and they can be rather impressive when they come out of the abyss. The thing to keep in mind here is that they aren’t related to jellyfish from a technical perspective.

While they lack tentacles, they do have cilia, which are projections similar to hair, used for swimming inside the water. This species is known for its red look, however, at massive depths, this still seems like black. However, they do get added protection when they come in lighted areas due to their impressive design.

Black Sea Nettle

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The black sea nettle is another red jellyfish. This one is known to appear in Baja California, Southern California, and the Pacific as a whole. It’s a very large species, and it can have a bell that’s up to 3 feet, and the arms can have up to 25 feet in total. Yes, this is a very scary sight and one that will impress you quite a lot for the longer term.

Despite the fact that it’s a very large species, the black sea nettle is known for offering a multitude of interesting features and ideas. They aren’t exactly old. Instead, they were just uncovered a few decades ago. Scientists don’t know where the creatures stay and what they want when they appear in groups.

Flower Hat Jellyfish

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This particular species is rather odd, and you can find it in regions like the Southern Japan coast and the Western Pacific as a whole. You can also find it in Argentina and Brazil. This is not a species that pulses, instead you can mostly find it near the ocean floor. The reason is simple; its diet consists out of smaller fish!

Despite the fact that they look great, these creatures are very challenging to deal with, and they do sting a lot. The MBA mentioned above stated that their sting is very painful. It can bring a bright rash, and in the end, it can easily interfere with shrimp fishing!

Mediterranean or Fried Egg Jellyfish

Mediterranean or fried egg jellyfish
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Are you interested to see how this species got its name? Simply put, this is known as the Mediterranean jellyfish because it can be found mostly in the regions near the Mediterranean Sea. The thing to note here is that their bell is surrounded by a lighter ring.

Another thing you have to note here is that they have a truncated mouth and the projections are long, sometimes even disk-like. They can survive for multiple months, and they will die right when the water will end up cooling down.

Like other jellyfish species, they also feed on zooplankton, and they do tend to eat some smaller fish too. They do hide inside the tentacles to receive the right amount of protection, a rather interesting thing to say the least.

Atolla jellyfish

Atolla jellyfish
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Known as the Coronate Medusa, the Atolla jellyfish is living in the deep sea regions. Because of that, it does have some interesting bioluminescent capabilities. They tend to attack their prey and stay away from enemies, which is rather nice, to begin with.

When this type of jellyfish is attacked, it will usually generate flashes similar to a police siren. This will end up attracting more predators that will most likely find the initial attacker a much better meal. This allows the jellyfish to escape, which is a rather distinct and elaborate plan.

That’s why some people call this species the alarm jellyfish because the way it works makes it feel like a real alarm.

Narcomedusae Jellyfish

Narcomedusae jellyfish
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This particular species has two stomach pouches, and it keeps the tentacles in front of it while swimming. This makes it very efficient as a predator, and it can provide you with some great results in the end.

Some species can grow within their mother which will allow them to receive better care and protection. At some point, they will leave their mother, and they will find another jellyfish, attack the flesh and stay in their body.

All these jellyfish species are rather distinct, and they do show the uniqueness offered by these amazing creatures. With this information, you should be able to know all you want about jellyfish and the way they live, where you can find them and all the other pieces of relevant info that you always wanted!

Do Jellyfish Have Brains?

Jellyfish are known for being distinct predators, and at the same time, they don’t have a brain like other beings. They are regular organisms which are basic, but you will be quite impressed with their unique looks, that’s for sure.

No Brains for Jellyfish

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Yes, the Jellyfish is a plankton, and it lacks brains. They don’t have a nervous system, and obviously, there are no brain signals. However, there are other ways they use to send the signals. They have touch receptors that are placed on the tentacles and near the mouth.

They do have neurons, though, and this means that they can figure out when the water chemistry will shift. In this particular way, they can also understand the motion of their prey and the size of those particular creatures is identified as well.

The receptors can also help them react to a wide variety of factors. Some consider them to be nerve nets, although this is a rather ambiguous thing, to say the least.

Balance and Light

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A thing to note here is that the nerve net allows a Jellyfish to perform routine capabilities. They allow a Jellyfish to maintain balance and they can also let the creature understand if there are any threats. The creature can also determine if there is any light emergency.

A thing to keep in mind is that the Jellyfish can sense the difference between surface and sea floor, not to mention they have a magnificent instinct that manages to keep them alive!

Some Jellyfish Have Eyes

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Although not all types of Jellyfish have eyes, there are some included in the Cuboza class that have eyes with lenses, corneas, and retinas. This allows them to see everything near them.

Of course, this is not a complete visual system, and in the end, this lacks the connection to a nervous system. Researchers are unsure how they process the information since they have no brain, but the nerve rings might be the explanation here.

Jellyfish Body Basics

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As we mentioned above, Jellyfish don’t have brains. Also, they lack many of the body parts that seem rather mandatory for other animals. You can’t find bones, hearts or ears here. They do have muscles which allow them to swim and they also have around 95% water inside their body.

Unlike other creatures, they are very delicate, and they don’t have any hard structures. This allows them to squeeze in between locations without that much of a problem!

Read Also: A Glimpse of the Life of Pictus Catfish

10 Incredible, Fun Facts You Need to Learn About Jellyfish

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Jellyfish are some of the most impressive creatures in the world. They have a massive history that spans over multiple years, and you can easily find an interesting fact about Jellyfish all the time. This shows you the incredible opportunities and unique ideas that you can find here and there.

That’s why we created a list to include 10 interesting pieces of fun facts about Jellyfish. If you ever were interested in jellyfish, you need to consider checking out this list!

1. Jellyfish Are basically “Cnidarians”

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Cnidarians are named after the Greek “Sea Nettle, ” and they are marine animals that have a body similar to jelly. They also have cnidocytes on the tentacles, and this allows them to attack their prey with ease. Such a thing does pay off a lot.

There are around 10000 species of cnidarians, and around half that are anthozoans. The rest is a combination of scyphozoans, hydrozoans as well as cubozoans which are Jellyfish.

These are some of the oldest animals that you can find on our planet. Scientists found some fossils that are around 600 million years old.

2. You can find Four Main Jellyfish Groups

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You first have the scyphozoans which are known as the true jellies. Then you have the cubozoans which are box jellies. The difference here is that the cubozoans are faster and their bells are boxier when compared to the other category.

Then you have hydrozoans as well as staurozoans. The latter ones tend to attach to the sea floor. A thing to note here is that these are medusozoans, which are a special invertebrate class that comes right under the cnidarian order.

3. Jellyfish are some of the simplest animals in the world!

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Jellyfish don’t have a nervous system and a circulatory system; they don’t even have a respiratory system. That’s why they are simple organisms because there are no major characteristics to be had here.

You just need their organless bodies that have only a gastrodermis, mesoglea and epidermis. That’s all, not to mention that most of their body is water, around 98% which is more than the 60% water a regular human has in his body.

4. Jellyfish Begin Their Lives as Polyps

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Even if they hatch from an egg at first, the reality is that they are a swimming planula. It does seem rather similar to a large paramecium. The planula will end up attaching to any firm surface.

It will then grow, and it will become a stalked polyp that will launch itself from that place, and then it becomes an ephyra, plus it will become a jelly in the end.

5. Some Jellyfish Have Eyes

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Not all of them have eyes, only some of them do. The cubozoans have around 2 dozen eyes that have their corneas and retinas. These are found near the bells, one of them looks upward and one downward.

This delivers a 360-degree vision to the Jellyfish. This alone shows how unique Jellyfish are, to begin with. They can use their eyes to find any predators, but they mostly use them for orientation as they swim.

6. Jellyfish Have a Unique Way of Delivering Venom

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We know that Jellyfish are indeed venomous and they deliver venom via biting. You will be able to find hundreds, and even thousands of different structures named nematocysts, and these can be seen on the tentacles.

Upon their stimulation, they will generate a large pressure of around 2000 pounds for square inch. This will lead to an explosion that will piece the skin of that victim with venom. As you can imagine, this can easily end up a tragic moment.

7. The Sea Wasp is the most dangerous Type of Jellyfish

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You will always end up worried that the rattlesnakes and black widow spiders are very poisonous. Jellyfish are also poisonous and the Sea Wasp is a good example here. It’s the largest one of the box jellies, and it does have around 10 feet in length.

You can find it in SE Asia and Australia as well. The Sea Wasp is known for killing 60 people in the last 100 years. This type of Jellyfish can deliver a lot of pain, and a person can easily die in up to 5 minutes!

8. Jellyfish will Move via Bell Ondulation

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These Jellyfish are known to be equipped with some hydrostatic skeletons. Their structure comes from hundreds of millions ago, and they have a bell where you can find fluid as well as circular muscles.

In order to move, the Jellyfish will perform a bell ondulation and it will contract the muscles then squirt the water in the opposite direction. Jellyfish will also be able to move based on the ocean currents, which is rather interesting to keep in mind.

9. There is a Jellyfish Species That May be Immortal

Turritopsis dornii jellyfish
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Yes, we all know that Jellyfish tend to have a short lifespan, but there is a species named Turritopsis dornii that gets to be immortal. How does it do that? It manages to revert to the initial Polyp stage.

This is rather interesting, and it does show the true value of this species. You can see this behavior solely in the labs, but it’s still something very impressive!

10. Jellyfish Groups are Called a “Bloom” or “Swarm”

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You can always find Jellyfish groups, but they aren’t exactly called groups, to begin with. As you can see here, they are called a swarm or bloom. They tend to have a few hundred or sometimes even thousands of Jellyfish. This makes them very attractive, unique and distinct.

These groups are becoming more frequent nowadays. We can imagine that this happens due to things like global warming and pollution. Plus, the oxygen levels in marine environments are lower, which is something pretty bad, to be honest.

11. Jellyfish Powder is an Ingredient for Salted Caramel

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Can people eat Jellyfish? A lot of people tried to answer this. It seems that numerous persons studied this and in the end, they found that Jellyfish can be suitable for human consumption if they are a part of a salted caramel recipe. Not exactly a vegan approach, but it’s certainly a rather delightful way to add Jellyfish to your meal.

12. Jellyfish can Eat Peanut Butter

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What seems like pretty much an amusing story, two aquarists from Dallas fed Jellyfish with some peanut butter and saltwater mix. It seems that jellies are fond of this particular combination. It was a simple trial, but one that shows that jellies do tend to like quite a lot of unusual combinations, that’s for sure.

13. Jellyfish Create Clones

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According to researchers, the lifecycle of a Jellyfish includes a unique combination of cloning and sexual reproduction. Plus, the damaged tissues or Jellyfish can easily regenerate, something that was proved by various researchers including an Australian marine biologist.

15. Jellyfish Have a Look Similar to Aliens

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It’s hard to figure out what Jellyfish look like, just because their looks are so distinct, to be honest. That’s why you could say that they look pretty much like aliens.

Some of them are very long; they do tend to have a wide variety of shapes and sizes and so on. If you do look and analyze them, they do seem like something from another world.

16. Some Jellyfish Have Glow in the Dark Capabilities

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Quite a lot of Jellyfish tend to have light-emitting organs. They can be used in a multitude of ways, such as gaining the attention of predators or attracting any possible prey. These bioluminescent organs are used for powering medical devices, among others!

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