The jellyfish is a very beautiful aquatic animal. It has no spine, but its body is very large, and it relies mainly on the buoyancy of the water to support its huge body.
The jellyfish body is shaped like a transparent umbrella, the umbrella diameter of large and small, large jellyfish umbrella diameter of up to 2 meters. From the edge of the umbrella body to grow some baleen-like strip, this strip is called tentacles, tentacles can be as long as 20 meters to 30 meters, equivalent to the length of a large whale. Jellyfish floating in the water, stretching out long tentacles in all directions, some jellyfish umbrella body also has a variety of color patterns. In the blue ocean, these swimming colorful jellyfish look very beautiful.
Jellyfish predate the dinosaurs, dating back 650 million years. At present, the world has found about 200 species of jellyfish, China's common about eight species, namely, the sea moon jellyfish, white haze jellyfish, jellyfish, mouth crown jellyfish and so on.
The tentacles of jellyfish are covered with stinging cells, like a small bean stuck to the tentacles. These stinging cells can shoot out poisonous filaments, and when they encounter "enemies" or prey, they will shoot out poisonous filaments to scare the "enemies" away or poison them to death. Jellyfish tentacles in the middle of the thin handle on a small ball, there is a small "hearing stone", which is the jellyfish "ears". Scientists have experimented with simulating the jellyfish's acoustic organ and found that they could detect an ocean storm 15 hours before it arrived.
Don't look at the jellyfish in the water is very beautiful, at ease, but without water it simply can not survive. Jellyfish body water content of 98%, it eating, digestion, excretion must be completed in the water. Without water, the jellyfish's body will become smaller and harder to see.
Jellyfish are more dangerous than cobras. A few years ago, the U.S. magazine World Wildlife synthesized the opinions of scholars from various countries and listed 10 of the world's most venomous animals, and at the top of the list was the box jellyfish, which lives in the ocean. The box jellyfish, also known as the sea wasp, is a coelacanth, mainly living in the northeastern coastal waters of Australia. Adult box jellyfish are the size of a soccer ball, mushroom-shaped and nearly transparent. An adult box jellyfish has billions of venom sacs and needles on its tentacles, enough to kill 20 people, and the toxicity is evident. Its venom mainly damages the heart. When the box jellyfish's venom invades a person's heart, it disrupts the consistency of the rhythm of the muscle cells beating, thus preventing the heart from supplying blood normally, leading to a person's rapid death.
The largest jellyfish is distributed in the northwestern waters of the Atlantic Ocean, the northern great jellyfish. 1870, a northern great jellyfish washed into the United States, Massachusetts Bay, its umbrella body diameter of 2.28 meters, tentacles up to 36.5 meters. And the smallest jellyfish is only 12 millimeters in total length.
The ctenophore will emit blue light when it swims in the sea, and when it glows, the ctenophore becomes a radiant ball of color; when it swims, the light band sways with the waves, which is very beautiful. Biologists in Singapore are currently conducting an experiment to transplant the luminescent gene from jellyfish into other fish.
The fierce and deadly jellyfish also has natural enemies. One species of sea turtle can move freely through a school of jellyfish and easily tear off their tentacles with its beak, causing them to roll up and down and eventually lose their ability to resist and become a "meal" for the turtle.
Internet forums also refer to female water-flooding maniacs as "jellyfish."
Jellyfish are a type of lowly coelacanth, taxonomically belonging to the phylum Coelacanths and the class Potamonoidea. There are about 250 species of jellyfish in the world, ranging from 10 to 100 centimeters in diameter, and they are common in the oceans everywhere. They are often categorized according to their umbrella-like body: some have a silvery umbrella body and are called silver jellyfish; some have an umbrella body that looks like a monk's hat and are called monk's hat jellyfish; some have an umbrella body that looks like a white sail on a ship and are called sail jellies; some look like umbrellas and are called umbrella jellies; and some have an umbrella body with a colorful haze of light and are called haze jellies ... ...Most of them live only a few weeks, but some live up to a year or so, and some deep-sea jellyfish can live even longer. Ordinary jellyfish umbrella is not very large, only 20 to 30 centimeters long, but the larger size of the giant umbrella of the summer jellyfish can be up to 2 meters in diameter, the drooping tentacles up to 20 to 30 m. In 1865, in the United States, Massachusetts coast, there is a summer jellyfish by the waves washed up on the shore, its umbrella diameter of 2.28 meters, tentacle length of 36 m. The umbrella was pulled out of the sea, and the tentacle was pulled out of the sea, and the tentacle was pulled out of the sea. Pull the tentacles of this jellyfish, from the tip of a tentacle to the tip of another tentacle, there are 74 meters long. Therefore, it can be said that the Kasumi jellyfish is the world's longest animal.
The main component of the jellyfish body is water, and by the inner and outer layers of the two embryonic layer is composed of, between the two layers there is a very thick gelatinous layer, not only transparent, but also has a floating effect. They are in motion, the use of the body of the water jet reflex forward, from a distance, as if a round umbrella in the water quickly drift. When the jellyfish in the sea swarms, live closely together as a whole like a deep floating on the sea surface, looks very spectacular. The waves are like snow, and the blue sea is dotted with many graceful umbrellas, shining with a faint pale green or blue-violet glow, some with a rainbow-like halo. Many jellyfish glow. The slender tentacles stretch out in all directions, drifting along with them in a beautiful display of color and swimming. Jellyfish have a special gland inside their umbrella that emits carbon monoxide, which causes the umbrella to expand. When a jellyfish encounters an enemy or is caught in a big storm, it will automatically let off the gas and sink to the bottom of the sea. Once the sea is calm, it only takes a few minutes for it to produce the gas to inflate itself and float. When the ctenophore swims in the sea, the eight meridian tubes can emit blue light, and when it glows, the ctenophore becomes a glorious ball of color; around and in the middle part of the banded jellyfish, there are several parallel bands of light, and when it swims, the bands of light sway with the waves, which is very beautiful. Jellyfish rely on a wonderful protein called Equimine, which emits a strong blue light when mixed with calcium ions. The more the amount of Equinine in the jellyfish, the stronger the light, and each jellyfish contains an average of only fifty micrograms of this substance.
Although jellyfish are beautiful and gentle, they are actually very fierce. Underneath the umbrella body, those slender tentacles are its digestive organs, but also its weapons. In the tentacles of the top covered with stinging cells, like poisonous filaments, can shoot out venom, after the prey was stung, will quickly paralyzed and die. The tentacles then grab these prey tightly, shrink back, and suck them in with the polyps under the umbrella body, each of which is able to secrete enzymes that rapidly break down the proteins in the prey. Because jellyfish do not have respiratory organs and circulatory systems, but only primitive digestive organs, the captured food is immediately digested and absorbed in the cavernous intestine. In the hot summer, when we swim in the sea tide, sometimes will suddenly feel the body of the chest, back or limbs of a burst of stinging pain, as if by the whip feeling, that will be the jellyfish in the strange sting. However, the general broken jellyfish stings, only feel the pain and red swelling, as long as the application of nitritive medicine or vinegar, after a few days that will be able to reduce the swelling and stop the pain. However, in the sea from Malaysia to Australia, there are two kinds of jellyfish called Sea Wasp Jellyfish and Hiking Jellyfish, whose secretion of toxicity is so strong that if you are stung by them, you will die of respiratory distress within a few minutes, so they are also known as Killer Jellyfish. So when stung by a jellyfish and breathing difficulty occurs, artificial respiration should be carried out immediately or cardiotonic injection should be given, and no carelessness should be exercised to avoid accidents. Once a jellyfish meets its prey, it never lets go easily. But just like the rhinoceros and the little bird that ****survives for it to clean up its parasites, the jellyfish has its own ****surviving partner. It's a small shepherd fish, no more than 7 centimeters long, that can swim between the jellyfish's tentacles as it pleases without being afraid at all. Encountered a big fish swimming, the small Shepherd fish will swim to the giant umbrella under the tentacles in the middle, as a safe "shelter", the use of jellyfish stinging cell device, cleverly avoided the enemy's attack. Sometimes, the small herring can even lure a big fish into the jellyfish's hunting range and kill it, so that it can also eat the leftover scraps of the jellyfish. So why don't the stinging cells on the jellyfish's tentacles hurt the Little Mako? This is because the small Shepherdfish is flexible and can skillfully avoid the poisonous filaments and is not easily harmed, but only occasionally there are inadvertent deaths under the poisonous filaments. Jellyfish and small herdsmen **** born together, each other for the use of the jellyfish "protect" the small herdsmen, and the small herdsmen swallowed the jellyfish inhabited by small organisms.
The fierce and deadly jellyfish also have natural enemies, a turtle can be in the group of jellyfish free shuttle, easy to use their mouths to tear off their tentacles, so that they can only roll up and down, and finally lost the ability to resist, become a "meal" of the turtle.
Jellyfish tentacles in the middle of the thin handle on a small ball, there is a small grain of hearing stone, which is the jellyfish's "ears". By the waves and air friction and the infrasound generated by the impact of listening to the stone, stimulating the surrounding nerve receptors, so that the jellyfish in the storm before the arrival of more than ten hours will be able to get the information, so they are as if they received an order as if, from the surface of the sea all of a sudden disappeared. Scientists have simulated jellyfish acoustic organs to do experiments, the results were found to be able to measure 15 hours before the message of the ocean storm.
Although jellyfish are lowly coelenterates, they have three enviable generations. Jellyfish give birth to baby jellyfish, which can survive on their own, but the bond between parent and child seems too strong to separate, so the baby jellyfish cling to the jellyfish's body. Soon after, the small jellyfish gave birth to grandchildren jellyfish, still closely linked together.