The zebrafish is a small tropical fish, belongs to the oviparous fish, usually in about 4 months old to develop and mature, the zebrafish will reproduce at 3 months to spawn, but in order to ensure the survival rate of the eggs, most of the zebrafish will be 5-6 months before they will be allowed to reproduce, the zebrafish in the process of breeding must ensure that the health of the water quality, because water quality health is very important. The male zebrafish has a slender body, large fins, yellowish body color, brownish-yellow anal fins, and prominent stripes; the female is fatter, lighter, bluish body color, and yellowish anal fins. Usually when zebrafish breed, the male will chase after the female until she lays her eggs, and then he will complete fertilization in vitro.

To make the zebrafish's fertilization rate higher, you need to isolate the female a few days before she becomes pregnant and spawns, and release 1-2 males to fertilize with the female, whose belly will gradually become lighter in color when she is about to spawn. Before the zebrafish reproduction, the belly will obviously become bigger, and accompanied by a certain temper, become big and irritable, some will run after the male fish, swimming time is obviously not as flexible as before, in addition to the size of the zebrafish, zebrafish reproductive holes will be protruding, at the same time the lower part of the abdomen will be presented with a pink color, in the soon to be spawning will be accompanied by an increase in the amount of food, when the appearance of a series of symptoms, that the zebrafish reproduction period.

After the zebrafish spawns, if there are other ornamental fish in the same tank, it is recommended to fish the zebrafish into the quarantine box for breeding, so as not to be frightened by other ornamental fish, then it is necessary to fish the parent fish out of the breeding tank, and in the incubation period, it is necessary to maintain the stability of the water quality, so as not to affect the hatching rate. During the period to maintain normal feeding, reduce the amount of water changes, you can appropriate water changes for stimulation, to accelerate the zebrafish reproduction. Female fish spawn as few as 300 eggs each time, more than a thousand, the eggs will be fished out after the output, with a special tank for incubation, incubation water temperature is maintained at about 28 ℃, generally 36 hours after the eggs can hatch out of the baby fish.

Zebrafish fry are born, can not be fed immediately, usually need 7-8 days and then start feeding yolk water, and pay attention to the water quality clean.