Before spawning, the belly of female goldfish will become bigger, but their belly will not be particularly obvious, which is difficult to find if breeders do not pay attention to observation. Before laying eggs, the female fish's character will become more lively. White dots will appear on the fins of male fish, which is called "idolize". Only after the male fish enters the breeding period will there be idolize on the fins. Besides idolize, the male fish will keep chasing the female fish, and from time to time use the belly of the female fish on the top of the head. At this time, it means that they are about to breed. Breeders need to prepare a separate breeding tank for them, and put more aquatic plants in the breeding tank, so that fish eggs can be better adsorbed on it.
2. How long goldfish hatch after spawningHow long goldfish hatch after spawning is affected by water temperature. If the water temperature of goldfish hatching is about 15-20 ℃, it takes 5-7 days for them to hatch. If the water temperature of goldfish hatching is about 20-22 ℃, they only need 3-4 days to hatch. If the incubation temperature can be kept at about 25 ℃, they can hatch successfully in only 2-3 days.
Breeders need to keep the water temperature constant during hatching. The water quality should also be kept clean and fresh, but try not to change water to avoid affecting incubation.