Fish can also be raised in a fish tank without an oxygen pump, but only some small fish can be raised, and the density cannot be too high.Fish on the oxygen demand is different, large fish must be kept in a high dissolved oxygen environment, small fish on the oxygen demand is not so big, no oxygen pump can also raise alive, such as goldfish, guppy, zebrafish, moonlight fish, swordtail fish, Mary fish and so on.
1. Goldfish: Goldfish is a traditional ornamental fish in China. It has a history of more than 1,700 years of cultivation. It is evolved from crucian carp. It has a strong adaptability and does not need to be oxygenated.There are many species of this kind of fish, usually divided into four categories, namely grass species, Wen species, dragon species and egg species, of which grass species is the best one to raise.
2. Fighting fish: Fighting fish are generally divided into Chinese fighting fish and Thai fighting fish. They can be kept alive without an oxygen pump, because these fish have an upper gill organ, which is a special respiratory organ. Even if the oxygen in the water is insufficient, they can also swim to the surface and absorb the oxygen in the air. Fish of the same family have this organ, such as Lili fish and Manlong fish.
3. Zebrafish: Zebrafish is a small tropical fish that has longitudinal stripes on its body, so it looks like a zebra.Because of its small size, this kind of fish does not need high oxygen, can be raised without oxygen pump, and has a mild temperament, likes to swim in groups, looks very beautiful.
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