The most venomous jellyfish is the box jellyfish.
Box jellyfish, also known as sea wasps, are the most venomous creatures known to humans on Earth. They are also among the first animals to develop eyes. A new study by Swedish scientists has found that box jellyfish have evolved a pair of special eyes similar to those of humans, which help them deftly avoid obstacles in the ocean.
Unlike ordinary jellyfish that drift in ocean currents, box jellyfish can swim flexibly in the ocean, quickly make 180-degree turns, and move dexterously between objects.
The box jellyfish has 24 eyes, which are distributed across the cup-shaped body at the top of the tubular body. These eyes are divided into 4 different types. The most primitive can only perceive the intensity of. light, but there is one.The eye is more sophisticated and can perceive color and size like the human eye. The distribution of these eyes allows it to see almost 360 degrees of its surroundings.
To test the box jellyfish's ability to avoid obstacles, researchers at Lund University in Sweden let the box jellyfish swim in a flowing pool and placed different obstacles in the water. It has been found that box jellyfish can avoid obstacles of different colors and shapes, but like people in water, they often cannot avoid transparent objects.
Reproduction and development of box jellyfish
The life cycle of box jellyfish is more complicated than that of other types of jellyfish. Common adult jellyfish come to bays and coves to mate, the females lay eggs and the males hatch, turning the eggs into larvae. The larvae are anchored on the rocks where the river jett in the sea. Here, the larvae transform into hydras. The polyps begin to reproduce asexually, that is, they divide into many small polyps, forming the army of jellyfish that will appear in December, when the rainy season begins.
The box jellyfish develops from a large jellyfish body to a floating larva, then gradually grows through the polyp, and directly transforms into a jellyfish body without going through proglottosis (Strobilation) and butterfly larvae (Ephyra). )scene.
Compared to other types of jellyfish, box jellyfish only generate one jellyfish per polyp. This is one of the reasons why jellyfish are so venomous. Scientists calculate that a newborn jellyfish can grow 1 millimeter per day and that its metabolism is faster than that of all other species. This may be because box jellyfish are the opposite of other jellyfish species.uses: They swim actively and can reach speeds of up to 10 kilometers per hour.
When the jellyfish reaches 5 to 6 centimeters, it becomes an adult. Its toxicity gradually increases and it begins to attack fish. Box jellyfish are extremely agile hunters, capable of eating fish as large as themselves. They stalk their prey, trap it in their tentacles, soften it with venom, then slowly digest it.
The ten most venomous jellyfish in the world are: hair jellyfish, Irukandji jellyfish, arctic jellyfish, luminous swimming jellyfish, monk jellyfish, Australian square jellyfish, jellyfish Australian box, jellyfish, sea wasps. , sand jellyfish. Among them, the sand jellyfish is one of the largest jellyfish in the world, with a diameter of It reaches 2 meters and weighs about 200 kilograms. It is usually attached to shells, rocks and other substrates. After being stung, the skin of the human body will be red, swollen, painful and itchy. in severe cases, shock or even death.
Man-of-war jellyfish: The tentacles of the man-of-war jellyfish are densely covered with tiny stinging cells. These stinging cells can secrete deadly toxins. Its toxins belong to the category of neurotoxins. its tiny tentacles can reach 30 feet. After being stung, you will feel intense pain, which can be fatal in severe cases.
Australian square jellyfish: The Australian square jellyfish is the most venomous creature known to humans on earth. It lives mainly in the waters off the northeast coast of Australia. Its tentacles have thousands of stinging cells that store venom. one Australian square jellyfish contains enough venom to poison 60 adults.
Irukandji jellyfish: The Irukandji jellyfish is one ofhe most venomous jellyfish in the world. Its small body is only a few centimeters long, but its body contains hundreds of times more poison than a jellyfish can kill. and are found mainly in the waters of Australia's Great Barrier Reef.