Zebrafish are not viviparous, they are oviparous fish. Zebrafish is fertilized and developed in vitro. When they reproduce, the female fish will lay eggs first, and then the male fish will come forward to inseminate. After hatching, fish eggs can become small fish. Viviparous is fertilized and developed in vivo. Fertilization and development of cubs are carried out in the mother's body. They are connected with the mother by umbilical cord, and they will not be born until they are mature. Most fish are oviparous, a few are oviparous, and few are viviparous.

Zebrafish can mature in 4-5 months. Zebrafish can be produced in adulthood, and the breeding frequency of zebrafish is relatively high. Under normal circumstances, they can lay eggs once every 7 days or so. However, it takes 2-3 days for fish eggs to hatch, so their breeding cycle is generally about 10 days.

Unlike other oviparous fishes, zebrafish do not need to rest for long to reproduce. Therefore, their breeding frequency is relatively high compared with other fish. Although they reproduce frequently, it is not recommended that breeders let them produce too frequently, because production will also consume their physical strength and energy. If the breeding frequency is too high, it will lead to shortened life span and poor physique.