CATDOLL : CATDOLL: Why is there no dace in Northeast China?

1. Why is there no dace in Northeast China?

The reason why there are no dace in Northeast China is the low temperature. Dace has very high requirements for the environment in which it grows, especially the temperature. It will die if the water temperature is below 7℃, and will not eat if it is below 14℃. It prefers to live in water temperatures of 25-30℃, which is not suitable for survival in Northeast China.

2. Does anyone know what is the lowest temperature at which dace will die?

Below 7 degrees will cause death

3. Why do dace often die?

Water quality is fundamental, as well as temperature and oxygen content.

4. How to read scientifically

Science is everywhere in life, but we just don't pay attention to it. People can't do without science in their daily life, such as production, labor, sports, health, and military. "Be proud of advocating science and be ashamed of ignorance." There are many conventional common sense in daily life, which are all the experience of our predecessors. Therefore, we mechanically think that these common sense are correct and beneficial, and often do them without thinking. Over time, they become habits, which also make your life troublesome, because these so-called " "Experience" and "common sense" are exactly contrary to common sense in life. We must believe in science. Only by respecting science can we avoid taboos and suffer less trouble. In winter, the weather is cold and glass bottle caps are often difficult to unscrew, no matter how hard you try. Experienced people can easily unscrew them by just putting the bottle caps on the fire. Do you know why? This is the principle of thermal expansion and contraction. When the weather is cold, the bottle cap shrinks and bites the bottle mouth tightly, making it difficult to unscrew it. After the fire heats up and expands, the bottle cap becomes loose, so it can be opened without much effort. When the old When people have trouble threading a needle, she rubs the needle on her hair. Do you know why? This is actually lubrication to reduce friction. Human hair contains oil, and when the needle rubs the hair, it is equivalent to adding lubricant, so it can reduce friction and make it easy to thread the needle. Spam, dace with black beans, beans in tomato sauce... are all delicious canned foods, and they can be stored for a long time without spoiling. This is because the cans are sealed and bacteria cannot enter. When people make canned food, they extract all the air in the cans and then seal it. In the absence of air, even if the food inside is contaminated with a few bacteria, they cannot survive or reproduce! This makes use of the air in the conditions for the survival of microorganisms. Some foods cannot be heated at high temperatures, otherwise it will affect their nutrition and taste. For these foods, we can quickly heat them to a certain temperature (usually 60℃~85℃) for 15 to 30 minutes, and then cool them quickly. This can kill most of the microorganisms in the food and maintain the original taste. This heating method is called Pasteur disinfection, which was invented by French scientist Louis Pasteur. Pasteur invented the concept of science. Science studies various natural phenomena and seeks the causes and laws of their generation and development. Every little question may lead to scientific discovery. Newton was curious about the apple falling to the ground and discovered the law of universal gravitation; James Watt was curious about the kettle lid lifting after the water boiled and improved the steam engine. As long as we pay attention to observation and start from exploring the problems around us, we can enter the world of science. Science is all around us.