After zebrafish matures, it will lay eggs 1-2 times almost every month. If breeders want them to lay eggs, they can pick out the estrus zebrafish and put them in a special breeding tank. As long as the environment in the breeding tank is suitable, the male fish and the female fish will chase each other, and the matching will be completed in the process of chasing. Female fish usually start laying eggs at noon the next day after entering the breeding tank, and their spawning speed is relatively fast, and the number of spawning is also relatively large. After the female fish lay eggs, the male fish will come forward to inseminate, and at this time they complete reproduction. Zebrafish have no habit of protecting eggs, so breeders need to isolate them immediately after production.

Zebrafish mature at 4 months of birth, and can mate and reproduce at this time. Zebrafish have no fixed time to lay eggs, and their breeding cycle is very short. Normally, their breeding cycle is about 8-10 days. If the breeding environment is good, their cycle can be controlled within 7 days, so they can lay eggs once every half month on average. Zebrafish not only lay eggs frequently, but also lay eggs in a high number. They can lay 100-300 eggs at a time, and some with better constitution will lay more eggs.