Why aren t fish afraid of the cold, why aren t fish afraid of the cold?

According to the British weekly "New Scientist", American university professors have cracked the reason why fish resist freezing. Until now, no one has been able to say exactly how antifreeze proteins help insects, fish and plants survive sub-zero temperatures.

But a detailed set of computer models supports the theory that antifreeze proteins prevent ice crystals from forming by attaching themselves to ice crystals and forcing them to change shape--- as if you put a stone on a pillow and the pillow deforms.

Many creatures such as whitebait and Antarctic cod make freeze-resistant proteins to help them survive in icy water. Theoretically, ice crystals form in their body fluids, which rupture fragile cell membranes and tissues, however, antifreeze proteins attach to the surface of the ice crystals and act as a deterrent to them.

Leonard Sandel and Alexei Tkachenko of the University of Michigan have confirmed how this process occurs. When proteins attach to ice crystals, the ice is forced to expand in the middle of them. Computer models show that if the expanding ice mass is large enough, the ice will swallow the protein instead of continuing to grow.

This slows down the expansion of ice crystals. "If the ice is formed more slowly, more protein will cling to it instead of being absorbed, so the ice doesn't have enough time to 'eat' them," Sandel said.

This process is disrupted, and ice stops forming. "When the ice stops forming, the surrounding liquid cools below freezing. Some animals are still able to survive when their body fluids reach minus 2 degrees Celsius.

The researchers tested this model with different shapes of proteins to speculate on how much water could be cooled before the ice reformed. Models show that spherical proteins are most effective because they don't have a place where ice can attack first, while rod-shaped proteins can't, as ice can easily generate at both ends of them.

Fish belong to constant temperature, animal fish are afraid of cold in winter. That's because of the water layer, which doesn't change as much as the warmth of the ground, and.

And the bottom temperature is higher than the surface of the water, so the fish are under the water in winter.

Fish is a cold-blooded animal, body temperature can increase or decrease with the change of outside temperature, winter air temperature, water temperature decreases, the body temperature of the fish also becomes correspondingly low, so the fish do not feel cold, but there is a certain limit to the ability to withstand cold, if the water temperature is too low, the fish will also be frozen to death.

Because fish is a cold-blooded animal, it does not have body temperature, so it naturally does not feel cold.

In winter the inside of the pond is warm.

Because the sea water has its fixed temperature, that is, it is not too high, and it is not too low, and the fish lives in the sea water, not because it is not afraid of cold, but because there is an inflow of ocean currents, it will not make the sea water temperature too high or too low, do you understand?

Reasons why fish are not afraid of the cold:

1. When the temperature drops, many fish move seasonally to deep waters. The warmer groundwater there helps keep the aquatic habitat freezing.

2. Some fish have evolved enzymes called isoenzymes to perform the same function at different optimal temperatures. Other fish make use of alleles—different forms of the same enzyme controlled by different alleles that allow reactions to work at different temperatures.

By regulating metabolism and regulating body temperature to achieve a balance with the external environment, people mistakenly think that they are not afraid of cold, and frozen fish will also have various reactions to be afraid of cold, and even hibernating.

3. In polar ocean systems, high salt concentrations will reduce the freezing point of water to about 2, which is lower than the freezing point of body fluids of most species. In these habitats, several species, most notably not tropical but also cod and some herring, antifreeze proteins prevent blood crystallization. This allows them to survive in the harsh polar regions covered in snow and ice.

4. Salt concentration. Other species have beaten the ultra-cold brine in their own games. Marine fish must constantly output ions to maintain osmotic equilibrium. However, retaining more ions helps lower the freezing point of the fish and survive in sub-zero temperatures.

Introduction

Some fish simply can't withstand the cold. Large-scale winter fish kills often occur under conditions of extreme temperature fluctuations. In 2011, for example, about 100,000 fish in the U.S. died in the Arkansas River, and a few warm weeks later saw a particularly cold front blow.

Finally, many ponds and small lakes are experiencing winter deaths, and a large number of fish kills are not because of the cold, but because ice restricts oxygen exchange. Fish may suffocate and float to the surface, where they get stuck in the ice.

Some fish are afraid of the cold, and some fish are not afraid of the cold. Tropical fishIt is a fish that is sensitive to cold. When the water temperature drops below 20, the vitality of the fish decreases.

Wide-temperature fish have a certain tolerance for low temperatures, and as long as the water does not freeze, the fish will not freeze to death. Common cold-water fish.

There are koi, goldfish and other fish, and the water temperature can be controlled at about 25 large sedan chairs when raising them to make them grow healthily.

There are many types of fish, some fish are afraid of cold, and some fish are not afraid of cold. Common tropical fish are cold-sensitive fish, the water temperature should not be lower than 20 when raising, and the fish will reduce their vitality when the temperature is too low, and even freeze to death.

Notes:

Wide-temperature fish and cold-water fish have a certain tolerance for low temperatures, and as long as the water does not freeze, the fish will not freeze to death. In addition, some deep-sea fish can tolerate low temperatures of 0 -2.

Common cold-water fish are koi, goldfish and other fish, and the water temperature can be controlled at about 25 to make them grow healthily, but it is recommended to place a heating rod in the fish tank to ensure that the water temperature is constant.

It depends on the type of fish, there are many types of fish, marine fish, river fish, tropical fish, and so on. Marine and river fish generally do not react very much to temperature. However, tropical fish, such as ornamental fish in general, are particularly sensitive to temperature, and of course each species will be different.

As long as the temperature fluctuates slightly more than the acceptable range, the fish will die.

The day before yesterday, it was so cold that the birds didn't come out, but when I went to play in the garden, I found that there were still fish swimming in the pond. Aren't they afraid of the cold?

When I got home, I checked the book "100,000 Whys", it turned out that they are not warm-blooded animals like humans, fish are cold-blooded animals, body temperature can increase or decrease with the change of external temperature, winter air temperature, water temperature decreases, and the body temperature of fish also becomes correspondingly lower, so fish do not feel cold, but there is a certain limit to the ability to withstand cold, if the water temperature is too low, the fish will also be frozen to death.

Yes! Nature is wonderful!

Just like our human body temperature is 37 degrees, fish also have their own body temperature, but the body temperature of fish is very low, and the ability of water to absorb and release heat is very low, more than 20 degrees on land, only a degree in water, a few degrees below zero on the mainland, who has more than 10 degrees, so from the body temperature of the fish, he has been accustomed to this temperature, so it is not cold; From the perspective of living environment, the water gives the fish a comfortable living environment, so the fish is not cold.

Fish are not afraid of the cold, because after freezing, the cold air outside is blocked by the ice, and the temperature is not too low

It turns out that they all make antifreeze proteins to help them survive in icy water. Researchers at the University of Michigan have devised a detailed computer model to support a theory that freeze-resistant proteins attach to ice crystals.

and force it to change shape to stop the formation of ice crystals——— as if you put a stone on a pillow and the pillow is deformed. In this way, even if the temperature in the body of the fish is below zero, the body fluids will not turn into ice crystals due to the action of antifreeze proteins, and the fish will survive Cats are good at catching rats and have long been known to be well-known, and cats love to eat fish. But why cats catch mice and eat fish, this secret cannot be said to be known to everyone.

Mice are animals that contain a substance called taurine that can improve night vision, but cats that have always been good at night activities do not have this substance, if the cat's body is not supplemented with taurine for a long time, then, the cat will lose the ability to see at night. In order to supplement "nutrition", cats must take taurine and retain their nocturnal habits, so they must catch a large number of mice.

After repeated experimental analysis, scientists found that fish meat also contains a large amount of taurine, which is why cats love to eat fish.

Fish belong to constant temperature, animal fish are afraid of cold in winter. This is because the water layer does not change as much as the temperature of the ground, and the bottom temperature is higher than the surface of the water, so the fish are not afraid of cold in winter.

Fish are cold-blooded animals. Ectotherms are also known as cold-blooded animals, and most of the animals on Earth are ectotherms. It is not that ectotherms need cold, but that.

The body temperature is similar to the environment in which they live, such as fish, frogs, snakes, chameleons, etc. The body temperature of ectotherms animals is the same as the ambient temperature.

Therefore, the proper noun of ectothermic animals to describe its variable body temperature is the best way to describe its true meaning.

Fish are not afraid of cold, they are not literary animals like humans, so cold-blooded animals, questions can increase or decrease with the change of outside temperature. In winter, the temperature of the water decreases, and the questions of the fish also become lower, so the fish do not feel cold. However, there is a limit to the ability of fish to withstand cold, and if the water temperature is too low, the fish will also freeze to death.

The fish that is not afraid of the cold is the result of its own bodily ability to adapt to the cold environment, the theory of evolution, the survival of the fittest. There are also fish that are afraid of cold, and tropical fish are afraid of cold. It's also the result of evolution. To survive is to adapt to the environment.

Because it's cold-blooded. And it is said that the fish are hibernating.

Because their system is adapted to survive in cold water.

Because most fish are cold-blooded, they can become warm, and their body temperature varies with the temperature of the water.

The above are all right.

Tropical fish that are more resistant to low temperatures include white micus goldfish, paradise fish, sturgeon juveniles, etc., and the water temperature is as low as about 4, and they can still survive. However, the more common tropical fish in life can only be active when the water temperature is above 20, and the water temperature can be maintained at 26 30 to be more energetic.

The vast majority of tropical fish prefer warm water, and there are very few tropical fish species that are not afraid of cold. Among them, the most resistant to low temperature are the white cloud goldfish, paradise fish, sturgeon juvenile fish, etc., which can still survive at a water temperature of about 4.

However, the more common tropical fish, such as guppies, kissing fish, map fish, angelfish, arowana and other fish, generally affect their normal activities when the water temperature is below 20 degrees Celsius, and when the water temperature is below 15, they may die.

In the process of raising tropical fish, it is best to keep the water temperature above 20 degrees Celsius, so that they can move normally, and keep the water temperature at about 26 30, so that they will be more energetic.

Fish are not afraid of cold because they rely on their own blood to regulate their body temperature and adapt themselves to temperature changes. The body temperature of the fish varies with the water temperature. When the water is warm, the body of the goldfish also becomes very warm, and when the water gets cold, the body temperature of the goldfish also decreases, which is roughly the same temperature as the water.

Fish are very adaptable to water temperatures, so they can live in a cold climate with freezing temperatures and a heat of more than 30 years. <

Fish are not afraid of cold because they rely on their own blood to regulate their body temperature and adapt themselves to temperature changes. The body temperature of the fish varies with the water temperature. When the water is warm, the goldfish's body will also become warm, and when the water gets cold, the goldfish's body temperature will also drop, which is roughly the same as the temperature of the water.

Fish are quite adaptable to water temperature, so whether it is in a cold climate with freezing points or a heat of more than 30, they can disturb the healthy life of Huaihua.