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tropical fish not to use oxygen? There are many kinds of tropical fish. It is okay for small fish not to use oxygen, but not for large fish. For example, guppy, zebrafish and lantern fish have low consumption of oxygen, so they will not encounter hypoxia without oxygen, while arowana, map fish and parrot fish are relatively large and have high demand for oxygen. The dissolved oxygen in water can not meet the demand, so they need an oxygen pump to oxygenate all the time.

Two, what fish can not play oxygen

1, guppy: guppy is a common small ornamental fish, body length is only about 3-4 cm, but its tail is very large, and very beautiful. Because of its small size, it does not consume much oxygen and can be kept alive without oxygen. This kind of fish has a very gentle temperament, which is very suitable for mixing other fish.

2, betta: Betta is a very strong fighting fish, usually can only be raised alone, not mixed or group, otherwise it is easy to fight. This fish has a special organ, the suprabranchial organ, which is a means for the fish to get oxygen from the air, so it can be fed without oxygen.

3. Mary fish: Mary fish is similar to guppies. It belongs to the same family. Its scientific name is jasmine. It is small in size and can survive in a low dissolved oxygen environment. However, its own ornamental general, color is relatively single, not as beautiful as the guppy looks.