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What fish is easy to raise without oxygen?

Ornamental fish that can't die without adding oxygen are: grass goldfish, koi fish, Mary fish, arowana, tiger skin fish, Lei Long fish, betta fish, colorful skirt fish, zebra fish and guppy fish.

1. Grass goldfish.

It is the ancestor of goldfish, and no one has artificially changed its genes. In terms of physique, it is closer to the original ecological fish, and it is much more sturdy and cheerful than ordinary goldfish. Moreover, the grass goldfish is a cold-water fish. It does not need a heating rod to heat it all year round, and it is not picky about food. It only needs to feed ordinary feed.

2. koi fish.

is a kind of ornamental fish deeply loved by people. Because of its unique meaning and long breeding history, it is sought after by the majority of fish friends in the aquarium industry. The price varies with the appearance or size.

3. Mary fish.

is a kind of small tropical fish with mild temperament, which is suitable for living in the water temperature of 23-28 degrees, has strong vitality, can adapt to all kinds of water quality, and can also live well in a small fish tank. This fish is omnivorous, can accept all kinds of feed, and is not picky about food.

4. arowana.

is a small tropical ornamental fish belonging to the family Percidae, with various species. The common mamarosaurs in the market are Lanmanlong and Jinmanlong.

5, tiger skin fish.

This kind of fish is about five centimeters long and has four black vertical stripes from the beginning to the end, which is as colorful as tiger skin, so it is called tiger skin fish. This fish is lively, swims quickly, looks good and has strong ornamental value.

6. Lei Long fish.

Lei Long fish gills are special, which can assist organs to breathe air directly, so the requirement for dissolved oxygen in water is not high. However, if there is no pump and no filtration, it is necessary to pay attention to whether ammonia nitrogen and nitrite exceed the standard, and it is also necessary to change water frequently.

7, fighting fish.

Conquered many fish friends with its enchanting tail fin. Betta is different from other fish in that it has auxiliary respiratory organs, which can breathe air directly in water and can survive when the water is short of oxygen.

8. colored skirt fish.

also known as the lamplight fish, it is an aurora variety of black-tailed fish, belonging to a small tropical ornamental fish, which is also a relatively hypoxia-tolerant species.

9. Zebrafish.

It is a small tropical fish with a very firm skin, which can adapt to most water quality, has low requirements on water temperature and has a high survival rate.

1. guppy.

with colorful body color and elegant figure, there are many varieties, including dresses, grass tails, metal, snake king, lace, Yinhe, Medusa and other strains, which are introduced to many fish farmers.