Zebrafish eggs usually hatch successfully in 2-3 hours. The specific incubation time depends on the water temperature in the fish tank. Generally, when the water temperature is kept at 24 ℃, it takes 2-3 days for them to hatch successfully. When the water temperature is 28 ℃, the incubation time only needs about 36 hours. Although the higher the temperature, the shorter the incubation time, if the incubation temperature exceeds 28 ℃, the eggs cannot hatch successfully. During the incubation period, in addition to ensuring the water temperature, it is necessary to ensure that the water quality is clean, otherwise it will reduce the probability of successful incubation.

1. Water temperature: Small zebrafish is just born and does not adapt to the new environment. Breeders need to keep the water temperature at about 23 ℃. If conditions permit, a heating rod can be installed to ensure constant water temperature.

2. Water quality: Zebrafish does not have too high requirements for water quality, as long as the raised water quality is clean and refreshing. The water for raising small fry should be changed once a day, and the amount of water changed each time should be controlled at one fifth of the total amount of water.

3. Feeding: Newborn zebrafish don't need to be fed, they will carry some nutrients themselves, and breeders can wait for their nutrients to be absorbed before feeding food. The breeder can feed some good-year shrimp eggs, egg yolk water, etc. to the young fry. After they are born for one week, they can be fed some red worms, yellow mealworms and other foods.