It is OK to raise fish without oxygen. Different fish have different needs for oxygen. Some fish do not consume much oxygen. Changing the water at ordinary times can increase the dissolved oxygen, and there is no need for additional oxygen equipment. If some large fish are raised, or the breeding density is relatively high, it may be necessary to prepare oxygen pumps and give oxygen to the water for 2-4 hours a day.
1. Goldfish: Goldfish is a common ornamental fish. It has a long history of cultivation in China, and there are many varieties. This kind of fish does not need very high oxygen, and does not need special oxygen equipment. Moreover, as a eurythermal fish, it has a strong adaptability to temperature, and its feeding habits are relatively complex, so it is very easy to raise.
2. Guppy: Guppy is a common small tropical fish. Because of its small size, it does not have a high demand for oxygen. If the breeding density is not very high, it does not need to be given oxygen. Although this kind of fish can tolerate the low temperature of 16 C, it is better to keep the temperature between 20-30 C, because the temperature is too low to get sick.
3, fighting fish: fighting fish is divided into Chinese fighting fish and Thailand fighting fish, no matter what kind, are not oxygen. As a fish of the family Crepidae, bettas have auxiliary respiratory organs, and when the dissolved oxygen in the water is low, they will swim to the surface and take oxygen directly from the air.
