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
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
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!
Read Also: What Do Jellyfish Eat?
Some Jellyfish Have Eyes
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
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
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”
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
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!
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
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
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
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
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
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
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”
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
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
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
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
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
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!