Under normal feeding, goldfish can mature in about one year. However, their specific growth time is still affected by the breeding methods. There are some goldfish with fast development speed. As long as the feeding environment is comfortable, they can mature in 7-8 months. If they are bred in a comfortable environment and fed with sufficient food, the speed of development will slow down and the time required for adulthood will be longer, which will take about 12-14 months.

1. Estrus: After goldfish mature, they will be in estrus every spring. If breeders want goldfish to breed, they should choose some healthy and lively goldfish. Also note that the ratio of male to female is kept at about 2: 1.

2, Prepare the breeding tank: For goldfish to breed, prepare a separate breeding tank for them. The water temperature in the breeding tank should be kept between 18-25 ℃, and the PH value should be kept between 7.2-7.4.

3. Reproduction: When goldfish reproduce, the female fish first produces eggs, and the male fish then excretes sperm. At this time, fish eggs will become fertilized eggs, and after waiting for a period of time, they will hatch into small fish.

4. Hatch: If the breeder wants goldfish eggs to hatch small fish, they should be fished out and hatched in a separate fish tank. As long as the water temperature in the fish tank is kept in a stable range, the small fish can hatch successfully within about one week.