But catfish can continue to eat without oxygen in the water. This kind of fish is resistant to hypoxia, so as long as there is no oxygen, it will not die, but it will affect its growth. This kind of fish has no scales and a lot of mucus. It has four beards on its upper and lower jaws, so it is also called Hu Yuzi. It is widely distributed, mainly in the Yangtze River valley of China. As a carnivorous fish, it also has high nutritional value.

It is not recommended to eat Tang people, fish and wild ones. The scientific name is the bearded catfish, also known as Tangjiao fish. Taxonomically, it belongs to Siluriformes, Siluridae. It belongs to tropical and subtropical fish, distributed in all parts of southern China. There are two kinds of common catfish in China: local catfish (bearded catfish) and Egyptian catfish (bearded catfish and bearded catfish). Tang people (local bearded catfish) have eight beards, four from top to bottom. The body color is yellow, the growth of wild fish is slow, and the general weight is not more than 1 kg, which has high nutritional value and good taste. It can be cultivated artificially and has great market potential. Most fish in unmanned ponds live in sewage environment such as sewers, and have strong vitality, and can also breed in manure.