When goldfish eggs are born, they are translucent pale yellow granules, and their diameter is about 1-1.2 mm. If it is fertilized fish eggs, the color will turn gray and white. Successful fertilized fish eggs will continuously absorb water, and at this time, one end of them will also appear black, which is the cell dividing to produce embryos. After waiting for 2-3 days, an obvious black dot will appear in the fish eggs, which is the eyes of the small fish. 5-6 days after fertilization of fish eggs, the embryos of small fish can move in fish eggs. At this time, wait for about 1 day, and small fish will break the membrane.

1. Prepare the hatching tank: After goldfish eggs are born, the breeder needs to fish them out and put them in a separate container. Because the male fish will have some residual substances during insemination, which will deteriorate the water quality. If it is not replaced in time, it may cause water pollution.

2. Install oxygen pump: Goldfish eggs need to ensure sufficient oxygen during hatching. If conditions permit, breeders can install a small oxygen pump to ensure sufficient oxygen in water.

3. Keep the water temperature constant: It is best for breeders to keep the hatching temperature between 18-25 ℃. If conditions permit, a heating rod can be installed to keep the water temperature in a stable range. As long as the water temperature is constant, the small goldfish can hatch successfully in about one week.