Why does water fall in love with fish? Fish can t live without water for a lifetime?

The water did not fall in love with the fish, it was the fish that fell in love with the water with wishful thinking.

Biological evolution: Under the natural selection of nature, today's fish have not been able to evolve to land, and cannot switch to using lungs to breathe, but are becoming more and more adapted to life in the water (in fact, the current land animals are all changed from fish).

Biology: The body of the fish is streamlined, scaly, has less friction in the water, uses fins to breathe, all for the sake of his better life in the water, and it is precisely because he lives in the water that he has these functions.

Where is the best place not to eat on fish:

1. A lot of fish gall bladders are poisonous.

For example, bile poisonous fish. Common bile poisonous fish include grass carp, carp, dace, herring, crucian carp, silver carp and fathead fish (silver carp, bighead carp). When cleaning the guts of the fish, be sure to remove the fish gall bladder.

2. It is said that there is collagen in fish scales.

It can beautify and nourish the skin, and it can't be lost. Yes, there are, but the content is not as good as pigskin. Moreover, collagen is not a high-quality protein, and it cannot be directly absorbed and utilized by the human body, let alone the role of beauty and beauty.

The above content reference: People's Daily Online After eating the fish head, it was found that the gills were green, and malachite green was still a suspect

Fish can't live without water for the following reasons:

Since the respiratory organs of fish are gills, and water is denser than air, it is only in water that the gill plates, gill filaments, and gill patches of the fish can be fully opened. By expanding the contact area between the gills and the water, the chances of ingesting dissolved oxygen in the water are increased. Fish rely on the alternating movement of the mouth and gills to swallow and drain water, and when the water passes through the gills, the gas exchange is completed in the capillaries of the gills.

Once the fish leaves the water, its gill plates, gill filaments and gill patches will be sticky together, and it can only rely on the appearance of its gills to contact the air to obtain oxygen in the air, and these small amounts of oxygen are far from enough to support the survival of the fish. At the same time, the fish's "gill breathing" absorbs oxygen dissolved in the water, and once it leaves the water, the water on the surface of the gill plates is quickly evaporated, and the fish loses the ability to absorb oxygen.

Not all fish can't get out of the water, such as barramundi. The lungfish, as its name suggests, has a swim bladder that resembles a lung. For most fish, the swim bladder is used to help the fish sink up and down in the water and maintain their body balance.

For the lungfish, its swim bladder has a miraculous function, because it can not only be used to balance the body, but also can be used as a lung, so its swim bladder is also called "primitive lung". In other words, in addition to breathing with gills, lungfish can also breathe through "primitive lungs", and it can survive for a long time after leaving the water.

Although the fish is the most primitive vertebrate, it evolved from the lower invertebrate Wenchang fish, whose ancestors lived in water from the beginning.

Children know that fish swim around in the water, and once they leave the water, the fish will die, why is that? Because, fish live in water and breathe with gills. Fish rely on the four gills in the gill cavity to suck in the oxygen in the water, and then discharge the carbon dioxide in the body into the water through the gill covers.

When the fish leaves the water, the water does not flow through the gill cavity, and the gills dry out quickly, and the gill pieces stick to each other, so that the fish can no longer breathe with the gills. Without breathing, the fish suffocated. Therefore, from childhood to adulthood, fish spend their entire lives in the water, eat in the water, sleep in the water, and swim freely in the water.

Kids, can you name any animals that also breathe with gills?

Fish like water so much, but the water boils the fish, because water is the source of all things, animals and plants are inseparable from water, fish like water is its life characteristics, its survival conditions are low temperature aerobic, once boiled with high temperature water, can not survive, what really makes the fish die is fire.

Because in this world, there are two sides to everything, and what is good for us can also be bad for us.

Mainly because water is one of the cheapest and most common cooking mediums in our cooking style.

Students, as the saying goes, "fish can't do without water", so do you know? Is it because the fish are afraid of the heat and the water is cool?

Is it because fish have no feet and can't walk? There is more oxygen in the air than in the water, so why do fish die so quickly on land with more oxygen? These problems are all related to the physiological characteristics of fish.

Fishes are the oldest vertebrates. They inhabit almost every aquatic environment on Earth——— from freshwater lakes and rivers to saltwater seas and oceans. This is because fish are suitable for living in water.

Crucially, the fish breathes through its gills, which are only adapted to absorb oxygen from the water; and cannot absorb oxygen from the air. So it can only live in water. We often see that the fish will always "drink water and foam", which is actually the fish breathing.

When water enters the mouth and is discharged through the gill cavity, gas exchange takes place on the gill filaments, thereby absorbing oxygen and expelling carbon dioxide to sustain life. If the fish leaves the water, the gill filaments are exposed to the air, the water evaporates, and the gill filaments will dry out due to water loss, destroying the structure of the gill filaments, because the gill filaments are one by one, and only water can be used to increase the area of oxygen absorption. If the gill filaments leave the water environment, they will stick to each other, and the function of gas exchange will be lost, and the fish will die due to suffocation.

Moreover, the fish's **, air sacs, and intestinal tubes can also assist breathing. The color of the fish's body is the protective color of the fish, which can hide from predators.