Why can t fish drown in water? Why don t fish drown in water?

Landlord, the reason why fish do not die in the water: the oxygen content in the air is much higher than in the water. Look at the gills.

The structure of which is made up of numerous capillaries.

Composition, water flows in from the mouth of the fish and out of the gills, so that the water passes through the voids of the capillaries, and the thawed oxygen in the water is absorbed by the fish, and the respiration of the fish is like this. The average fish has no problem living in the air for a few to dozens of minutes, because its gills remain moist and can continue to absorb a part of oxygen, so it will not suffocate immediately, but after a long time, the gills will slowly dry out, and the fragile capillaries will die quickly, which is why, sometimes you see the fish alive on the shore, and it will die after a while when it is put back in the water, because its gills lose the exchange of oxygen and carbon dioxide.

Even if you return to the water, you will die.

Life depends on oxygen! Because there is oxygen in the water, the fish can filter it out with their gills.

Fish have gills. It can send oxygen from water to the body.

Because the fish breathes by the gills, it will not be drownedTerrestrial animals are drowned because they cannot use the oxygen in the water and die due to lack of oxygen in the body, and the fish breathe with gills and can directly absorb the oxygen dissolved in the water through the gill capillaries, which will not make the body lack oxygen, so it will not be drowned.

The main characteristics of the fish.

1.Presence of upper and lower jaws. This was an important turning point in the evolutionary history of vertebrates, with jaws increasing access to food, improving the ability to live and enhancing animal adaptability.

2.There are paired appendages - even fins. Greatly enhances mobility and becomes a condition for the appearance of limbs in terrestrial vertebrates.

3.Complete endoskeletal system. The spine completely replaces the notochord.

4.The brain is distinctly divided into five parts, with both nostrils and the appearance of semicircular canals.

5.Breathe with gills.

6.There is a good mechanism for regulating osmotic pressure in the body.

7。The blood circulation is single-circulation.

8.Regulate the buoyancy of the water with swim bladder and fat.

9.Swim by the swing of the tail or trunk, as well as the coordination of the fins.

<> fish breathe by gills, so they will not be drowned, land animals are drowned because they cannot use the oxygen in the water, causing the body to die due to lack of oxygen, fish breathe with gills, can directly absorb the oxygen dissolved in the water through the gills capillaries, will not make the body hypoxic, so it will not be drowned.

Although fish live in water, they can also drown. These animals generally rise and sink by adjusting their swim bladders, but when they reach a certain depth, excessive water pressure will make their swim bladders lose their function, so that they cannot float up, and can only swim to deeper places, and the strong water pressure will make them unable to breathe, and eventually they will drown.

Fish can drown, although they can breathe in the water, but when they enter a certain depth of water, due to the excessive water pressure, they cannot adjust their swim bladder, so they can not float away, can only swim to a deeper place, and the strong water pressure will also cause them to be unable to breathe, so that they are drowned.

1. Inability to breathe: Unlike terrestrial animals, fish have their respiratory organs not lungs, but gills. The gills are densely covered with gill filaments and have a large number of microvessels on them, and when the water flows through, the direction of the water flow is opposite to the direction of the blood flow, so that efficient gas exchange can be completed to obtain oxygen.

Once out of the water, the gill filaments stick together and cannot take in oxygen in the air, causing it to be unable to breathe and thus suffocate.

2. Pressure change: fish live in water, different depths of water, water pressure is not the same, in order to adapt to such water pressure, fish in their own cells liquid pressure will also balance with it, which leads to them can not leave the water body under that pressure, otherwise they will die because they cannot adapt to the pressure change.

3. Can't prey: Fish live in the water and rely on their fins to swim, which allows them to move freely, and at the same time, the special throat teeth can also process food, and their own activities are greatly limited after leaving the water, and the ability to hunt is basically lost, so even if they can live out of the water, they will starve to death because they can't hunt.

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Problem description: When changing the water for the fish again, from one fish tank to another fish tank, when the fish is poured out, there will be a staggered flow of water, at this time, will the fish choke to death?

Analysis: The fish does drown, and that's when its respirator, the gill of the respirator, is seriously problematic, which is equivalent to the diver having his oxygen cylinder removed.

When changing the water for a fish, changing from one tank to another causes problems for the fish to be the temperature difference in the water. Fish is ectothermic animals, body temperature close to the water temperature, if the water temperature suddenly changes drastically, it will make the body of the fish metabolic disorders, serious can lead to sudden death, the principle is like a person living in Shanghai in 5 minutes suddenly sent to Mount Everest, can not adapt to the problem will have problems.

Yes. Like land-based creatures, fish must have oxygen to survive, and if there is no oxygen in the water, the fish will die of suffocation, that is, drown in the water.

Can fish drown? Hearing this question, it is estimated that many people will laugh and say: how can this happen, fish live in water and cannot be drowned.

Fish do live in water, but like land-based creatures, they must have oxygen to survive. If there is no oxygen in the water, the fish will also die of suffocation, that is, they will drown in the water. Generally speaking, there are two reasons why fish suffocate in the water.

In the first case, a large number of aquatic plants suddenly appear in the water, and these aquatic plants deplete the oxygen in the water, and the fish living in this water area will die due to lack of oxygen.

In the second case, the fish overdives and dies of suffocation. Fish use their swim bladders to regulate their weight, allowing them to float or dive freely in the water. If the fish dives deeper than it can tolerate, the swim bladder will lose control, and the fish will not be able to float again and eventually die of suffocation.