What is the cause of koi fish's cylinder collision?

In the process of koi fish's breeding, sometimes koi fish was injured due to improper operation when fishing or cleaning fish tanks. This seemingly simple disease, if we don't pay attention to the maintenance of water quality at ordinary times, will probably lead to the invasion of microorganisms or pathogens into fish, which will lead to trauma in koi fish and even directly endanger the life safety of koi fish. When the water quality is unclean or the feces in the fish tank are not removed in time, many harmful bacteria and microorganisms will breed, so that microorganisms or pathogens will invade the fish and cause many diseases. For example, bacterial disease gill rot will eventually lead to the decay of the tip tissue of the gill filament, which will lead to the incompleteness of the gill filament and eventually lead to trauma. Similarly, viruses produced by unclean water can cause hemorrhagic diseases and eventually lead to partial gill rot. It can be seen that the influence of water quality on diseases should not be underestimated. Koi fish's injury was also caused by the sudden change of a certain element of water quality, such as the stress reaction caused by a large change of water quality or the inadaptability of new fish to the new environment at home, which made koi fish jump up and hit the tank. If not treated in time, these minor injuries are likely to be infected and inflamed, eventually forming a relatively large area of damage. People who raise koi fish urgently need to control the water quality. Whether it is tank culture or fish pond culture, whether it is chromaticity, temperature, dissolved oxygen, hardness or pH value, it must meet the conditions for raising koi fish. At the same time, we should also pay attention to the control of trace elements in water, such as ammonia nitrogen, nitrite and nitrate, which must meet the normal acceptance range in koi fish. Excessive ammonia nitrogen content will directly endanger koi fish's life, and ammonia nitrogen is the product of food residue, koi fish excrement and other substances, so we should always pay attention to the cleanliness of fish tanks or fish ponds. If koi fish is found to be ill, he should be treated in time. There are many kinds of therapeutic drugs on the market, so it is difficult to choose. For fish farmers, they are not doctors, have no treatment experience, and have no professional treatment units. It is often impossible to watch beloved koi fish get worse every day until he dies. This kind of mood is difficult to express in words.