Zebrafish will lay eggs within about 7 days after its belly is big, because their reproductive cycle is relatively short and their reproductive speed is also very fast. When their bellies start to get bigger, the breeder can put them in the breeding tank together with the male fish. If they are found chasing each other, they will have a good chance of laying eggs within 2 days. Zebrafish reproduce frequently, laying eggs 2-3 times a month, and the number of reproduction is relatively large, which can produce about 200 eggs at a time.

Zebrafish eggs can hatch successfully in about 2-3 days after fertilization, and newly hatched young fish will not swim flexibly. At this time, the breeder does not need to feed them, so that they can absorb the vitellotin carried by their mother, and then feed some shrimp eggs and cooked egg yolks in good years.

Newborn fry are sensitive to environmental changes, so breeders need to use heating rods to keep the water temperature at 23 ℃. In addition, the change of water quality should not be too great, so breeders should control the amount of water exchanged at one quarter of the total amount of water. In addition, it is best for breeders to install oxygen pumps to ensure sufficient oxygen in the living environment of small fry. However, be careful not to turn on the circulating pump, so as to avoid too much water flow and suck away the small fry.