Rumors:
When feeding the fish, you can't feed too much, the goldfish don't know how full they are when they eat, and they will die if they feed too much.
The truth:
Originating in China, the goldfish is the same species as the crucian carp in the academic classification, also known as the "golden crucian carp", which is similar to the carp and evolved from the reddish-yellow wild crucian carp. Regarding goldfish, there was a written record of "red scale fish" in the ancient Jin Dynasty, which can be called the quintessence of China. Goldfish have a gentle temperament and are easy to raise, and their lifespan is about 6 years. Goldfish have a strange body, beautiful shape, and gorgeous colors, and are loved by people.
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Goldfish feed is mainly made up of live food such as fish insects and red worms and synthetic fish food, but no matter which one it is, when the feeding amount is too large, there will be endless feed left in the fish tank, which leads to problems. When full, goldfish have an increased oxygen demand due to the digestion of food. On the one hand, spoiled food will produce various toxic metabolites and pollute the water body, and on the other hand, microorganisms will also consume dissolved oxygen in the water during the sorting process. At the same time, if you are fed live food, the food itself will also increase oxygen consumption.
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As a result, the water in the tank will deteriorate and the amount of dissolved oxygen will decrease after overfeeding the fish. When the amount of dissolved oxygen in the water is insufficient, the goldfish will have physical dysfunction due to lack of oxygen, which will lead to the death of the goldfish. Therefore, goldfish are not actually "hungry", and most of the goldfish in the fish tank are "suffocated" to death because of dissolved oxygen in the water.
There are also many friends who have encountered this situation, when buying fish in the flower, bird, fish and insect market, the goldfish are alive, but they can't be raised for a few days when they are brought home. What is the reason for not changing the water frequently and not feeding a lot of fish food?
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In fact, due to the wide variety, long transportation cycle, frequent operation and other reasons of goldfish on the market, it is easy to be damaged, cross-infection, etc., in order to prevent goldfish from being infected in a large area, many merchants will add antibiotics to the water to enhance the resistance of the fish. In this case, the selection skills when buying goldfish are particularly important. A healthy goldfish should have bright red gills, a bright and translucent tail, and a normal fin color around the anus. The gills of the diseased fish are somewhat blackened, the tail is dark in color, and there are bloodshot and bifurcations. After understanding this knowledge, we must pay attention to a small amount of goldfish when feeding them in the future, and we must clean up the fish food in time when there is leftover. Of course, we should also pay attention to the problem of oxygen supply, so as to avoid tragedy.
This article is produced by the "Scientific Rumor Refutation Platform" (ID: Science_Facts).