CATDOLL : CATDOLL: How to keep jellyfish?

1. How to raise jellyfish?

When raising jellyfish, you need to pay attention to four aspects: water quality, species of organisms raised together, food, and light. The specific analysis is as follows:

1. Water quality: Jellyfish are marine organisms, so they must be cultured in seawater. The water should be changed every week or so to prevent dirt and microorganisms from blocking the jellyfish and fish from receiving energy and affecting their movement speed. Be careful not to touch the jellyfish when changing the water. Don't rush when adding water, but slowly.

2. Types of organisms raised together: Jellyfish have relatively low defense capabilities, so do not place aggressive or poisonous soft-bodied organisms in them to ensure the jellyfish can live normally.

3. Food: The food of jellyfish in the water tank is mainly small fish and shrimp. At the same time, jellyfish liquid feed, seawater trace elements, etc. should be supplemented so that the jellyfish can grow healthily and nutritiously.

4. Light: Light is very important to jellyfish. The single-celled zooxanthellae in jellyfish can use light to carry out photosynthesis, providing them with oxygen and energy to sustain life.

Additional information:

Jellyfish are dioecious, with reproductive glands near the stomach sac. Mature sperm flow into the female jellyfish for fertilization. The fertilized eggs develop into larvae and leave the mother's body. After swimming in the water for a while, they sink to the bottom of the sea to form larvae, and then become polyps. The polyps split into multiple disc-shaped larvae, and then develop into adult jellyfish. Although jellyfish are low-level coelenterates, they have three generations living under the same roof, which is enviable.

The jellyfish gave birth to baby jellyfish. Although the baby jellyfish can survive independently, the parent and child seem to have a deep affection and cannot bear to be separated, so the baby jellyfish all cling to the jellyfish's body. Soon after, the baby jellyfish gave birth to grandchildren of the jellyfish, and they are still closely connected.

2. Can jellyfish be raised with Yellow River water?

cannot.

The water of the Yellow River is fresh water, while jellyfish are sea animals!

If you want to raise jellyfish, please search the living habits of jellyfish on Baidu for details.

3. What food do small jellyfish eat?

Jellyfish are carnivorous, feeding on plankton, small crustaceans, polychaetes and even small fish. Due to the mechanical and chemical stimulation of the food, the hydroids extend their tentacles and release nematocysts to entangle, paralyze and poison the captured prey, and then send the food into their mouths.

4. Can edible salt be used instead of sea salt for jellyfish farming?

Sea salt is a kind of salt that is directly dried from seawater. It contains many minerals that are harmful to the human body, but lacks minerals that are necessary for the human body. Edible salt is processed to remove harmful substances and add iodine and other minerals that are beneficial to the human body. There is always a difference, but I haven't tried it to see how big the impact is. Sea salt is not expensive and a bag can be used for a long time. The key to water quality is still to look at the concentration.

5. Which jellyfish is the most poisonous?

Australian box jellyfish (also known as Australian box jellyfish): lives along the coast of Australia. If a person touches its tentacles, he will die within 30 seconds.

The box jellyfish, also known as the sea wasp, is a coelenterate that mainly lives in the waters off the northeast coast of Australia and often floats in the shallow waters off the coast of Queensland. The box jellyfish is considered to be the most toxic creature known in the world to humans. A sting can kill a person within 30 seconds. An adult box jellyfish is as big as a football, mushroom-shaped, and almost transparent. On both sides of its body, there are two primitive eyes that can sense changes in light, and it has more than 60 ribbon-like tentacles behind it. These tentacles are the deadly part, which can extend to more than 3 meters. On each tentacle, there are densely packed sacs, and each sac has a hollow "poison needle" filled with venom that is invisible to the naked eye. An adult box jellyfish has billions of venom sacs and poison needles on its tentacles, enough to kill 20 people, which shows how toxic and murderous it is. There are also receptors on its tentacles that can recognize proteins on the skin of fish, shrimp or humans. When the box jellyfish finds its prey, it quickly floats over, wraps its tentacles around the prey, and immediately sprays venom with its stinger. Once the venom is sprayed onto a person's body, many bright red scars will immediately appear on the skin, and the venom will quickly penetrate into the heart, killing the person in just two to three minutes, leaving no time for rescue.

Why is the box jellyfish so toxic? It is not clear yet, but researchers have found that its venom mainly damages the heart. A healthy person's heart has millions of muscle cells, and these muscle cells beat in the same rhythm. When the venom of the box jellyfish invades the human heart, it will destroy the consistency of the rhythm of the muscle cells, so that the heart cannot supply blood normally, leading to rapid death. Studies have also found that acetic acid can kill the tentacles of box jellyfish, so scientists recommend that tourists who go swimming and diving in Queensland should bring a bottle of vinegar to use when encountering box jellyfish. However, scientists are analyzing the structure of the box jellyfish venom, hoping to create a good preventive and therapeutic medicine to avoid box jellyfish-related deaths.

The box jellyfish, the most venomous creature known to humans, was one of the first animals to evolve eyes, and a new study by Swedish scientists has found that it has developed a special set of eyes similar to those of humans that help it nimbly avoid obstacles in the ocean.

Unlike ordinary jellyfish that drift in the ocean currents, box jellyfish can swim flexibly in the ocean, can quickly make 180-degree turns, and nimbly shuttle between objects. Box jellyfish have 24 eyes, distributed on the cup-shaped body at the top of the tubular body. These eyes are divided into 4 different types. The most primitive one can only sense the intensity of light, but there is a more sophisticated eye that can sense color and the size of objects like human eyes. The distribution of these eyes allows it to see almost 360 degrees of the surrounding environment.

To test the ability of box jellyfish to avoid obstacles, researchers at Lund University in Sweden let them swim in a flowing water pool and placed different obstacles in the water. The results showed that they could avoid obstacles of different colors and shapes, but like people in water, they often could not avoid transparent objects.

6. Can jellyfish discharge electricity?

In fact, any living thing will discharge electricity, which is due to the action of the ion pump on the cell! To be precise, a protein on the cell membrane pumps the Na ions in the cell out of the cell (generally speaking, the concentration of sodium ions is higher outside the cell, and the concentration of potassium ions is higher inside the cell), causing a potential difference between the inside and outside of the cell membrane. When needed, the sodium ions enter the cell through the ion channel, thus generating an electric current, the so-called bioelectricity. That is, there is a potential difference on both sides of the cell membrane. Things like nerve cells transmitting information are all the result of bioelectricity.

For some special discharge organisms, it is because they have specialized bioelectric cells that can store large ion concentration differences and can discharge relatively large amounts of electricity when necessary.