Will it kill you to feed the fish?

Hello goldfish is very particular. It is often said that goldfish should not be fed too much. Goldfish don't know how full they are when they eat If you feed them too much, they will die. Goldfish in fish tanks are often labeled as "unsatisfied" when they eat too much, and the fish raised in those fish ponds seem to know the etiquette of eating very well. Is goldfish really more stupid than other fish? Therefore, many people who have raised goldfish, especially those who have died, often teach novices not to put too much food when feeding goldfish, otherwise it will eat until it dies. Is that really the case?

Goldfish and crucian carp belong to the same species in taxonomy. Goldfish originated in China, also known as "golden crucian carp", similar to carp. Goldfish are easy to raise. It has a strange posture, colorful and beautiful shape, and is deeply loved by people.

Generally, goldfish have live food (such as fish worms and red nematodes). ) and synthetic fish food. No matter what kind, goldfish will leave endless feed if they are fed too much, which will lead to problems. Goldfish is a kind of temperature-changing animal, which will increase its food intake with the increase of water temperature. In order to digest food, the oxygen demand of goldfish will increase after eating. Excessive food will be decomposed by microorganisms in water, producing various toxic metabolites and polluting water quality. On the other hand, microorganisms will consume dissolved oxygen in water during decomposition. If you feed live food, fish and insects themselves will compete for oxygen in the water. Therefore, after excessive feeding of fish food, the water quality will deteriorate and the oxygen content in the water will drop. When the dissolved oxygen in the water is insufficient, goldfish will have organ dysfunction due to lack of oxygen. In this case, the goldfish is likely to die.

I don't know if you have ever encountered this situation. The goldfish you bought at the flower, bird, fish and insect market "died" in a few days at home, and they all looked alive when you bought the fish. I didn't change the water often, and I didn't feed more fish food. So, what is the reason? In fact, goldfish sold in the market of flowers, birds, fish and insects are prone to cross-infection because of their many varieties and frequent transportation. In order to prevent fish from getting sick, many merchants use antibiotics in water to enhance the resistance of fish. In this way, the skill of choosing goldfish when buying fish is very important. The gill color of healthy goldfish should be bright red, the tail color is bright and translucent, and the fish anus should also be normal fin color. But the gill of the sick fish is a little black, and the tail is dark, bloodshot and forked.

After understanding this knowledge, you must pay attention to a small amount of goldfish in the future, and you must clean up the rest of the fish food in time. Of course, we should also pay attention to the problem of oxygen supply to avoid tragedy.

This work is the original of "Popular Science China-A Brief Introduction to Scientific Principles", please indicate the source for reprinting.