Fish are aquatic creatures, why are they drowned by water?

There are many strange species in the world, and fish is the most common creature in life. They can be found in ponds, lakes and oceans. We all know that they can live in salt water and fresh water. But why do fish living in water "drown"? This makes many people very confused. Obviously, fish can't live without water. How did they drown? Is it because they choked on drinking water? In fact, this is not a joke, and experts have also said why.

Most fish have gills, swim bladders, fish bubbles and so on. These organs are the most important for fish. Without these organs, they can't survive in water. It took hundreds of millions of years for nature to turn the earth into such a colorful ecological chain. Since human beings have no fish organs, they can only live in water by equipment. If there were no oxygen tanks, then human beings would drown in the water. Similarly, if the fish has no oxygen, even if the water is clear, it will drown in the water. In other words, if boiling water is poured into the fish tank, the fish will soon die. So this is actually the first way to drown fish.

There is also that freshwater fish can no longer live in salt water, or they will be drowned. Although they are all relatives, there are still some differences. If you sprinkle salt into the water, the salt will affect the oxygen content of the water. As the saturation of dissolved oxygen in water gradually decreases, fish will suffocate due to lack of oxygen. There is also a "special case fish", that is, puffer fish. Whether it is fresh water or salt water, it can live leisurely in the water.

And this way will also "drown" the fish. This is not drowning in the general sense. If the air pressure of water is changed, even if the oxygen content in water is higher, fish will be affected. This kind of situation is not common in life, and it usually happens to fish in the ocean. For example, the small yellow croaker, which is common in the deep sea, will die before landing as the water pressure becomes lower and lower during fishing. On the contrary, if the normal carp is put into the deep sea, it will only live for a few seconds.