Under normal circumstances, goldfish eggs need 2-7 days to hatch small fish. But how long it takes to hatch small fish depends on the incubation water temperature. When the incubation water temperature is 15-20 ℃, it takes 5-7 days for them to hatch successfully. When the incubation water temperature is raised to 20-22 ℃, the incubation time can also be shortened to 3-4 days. When the incubation water temperature can be raised to 25 ℃, the incubation time only needs 2-3 days.

During goldfish hatching, breeders should not only control the water temperature, but also control the water quality. In addition, after successful hatching, small fish should try to keep the temperature during hatching, so that they can adapt to the external environment more quickly.

1. Water temperature: The newly hatched small goldfish has poor adaptability to the environment, and breeders need to keep the water temperature stable. If conditions permit, it is best to install a heating rod to keep the water temperature constant.

2. Water quality: The newly hatched goldfish do not require high water quality, as long as the water quality they live in is clean and refreshing. However, the newly hatched goldfish are small in size, so breeders should try not to use filters to clean the water quality, so as to avoid them being sucked away by filters.

3. Feeding: Small goldfish do not need to be fed for the first three days of birth. After they are born for three days, they can be fed with some cooked egg yolk, shrimp eggs in good years, backwater and other foods. When they are born about a week ago, they can be fed some chopped red worms, lean meat and other foods.