What are the freshwater fish that can tolerate hypoxia? Can they be fed without oxygen?

There are many freshwater fish that are tolerant to hypoxia, such as betta, mandragonfish, cichlid, lucky fish and zebrafish. Usually, the smaller the fish is, the less oxygen it needs. As long as the feeding density is not very high, it can be kept alive without oxygen. There are also some special fish, which have auxiliary respiratory organs, even if the dissolved oxygen in the water is insufficient, they can also absorb oxygen in other ways.

There are two kinds of fighting fish, one is Chinese fighting fish, the other is Thai fighting fish. The former is produced in China and has a wider adaptability to temperature, while the latter is produced in Thailand and needs to be fed in warm waters. No matter what kind of fighting fish, it has a strong fighting nature, and two males will fight together, so it is not suitable for polyculture.

Manlong

Manlong, like the betta, is also a fish of the gourami family. It is small in size, does not require high water quality, and is resistant to hypoxia, because it can breathe on the surface of the water. This kind of fish has a short life span, usually no more than three years, and a fierce temperament, which can be kept with some docile fish.

Cichlidae

is the smallest fish in the genus Cichlidae. Its body length is only 5-6 centimeters. It is suitable for growing in the environment of 22-26 degrees Celsius. The male is very beautiful. There are three colors of red, blue and orange on its body, while the male and female are yellow and blue. If you want to keep this kind of fish, you'd better provide some places to hide, because they are timid.

4. Zebra

fish Zebrafish is a small tropical fish, which does not require high dissolved oxygen, and can survive in a low dissolved oxygen environment, so it is very easy to raise, and its reproductive capacity is strong, it is easy to become a lot.