The fertilized eggs of the big whitebait should be incubated at a low temperature. The hatching time is relatively long, and it is hatched until the mid-term of the original intestine that can be transported and put in. The average water temperature is 6°C-7°C and it takes more than 100 hours. It takes about 30 days to hatch into fry. If the water temperature is lower, the incubation time is longer, so the change of water temperature must be controlled throughout the incubation process. Meet the requirement of dissolved oxygen for the development of fertilized eggs to prevent the emergence and spread of fertilized eggs.
The water temperature is controlled within 1°C-8°C, and water can not be frozen or exceed 10°C, otherwise it will greatly reduce the hatching rate or developmental deformity. The sudden change of water temperature should be controlled within 2°C. When the water is changed, the reservoir water with the same temperature can be used to change the water. The dissolved oxygen is achieved by changing the water. Generally, the number of daily water changes is determined according to the water temperature, and the average value within 3 days starts. Water temperature is about 3 °C, or do not move the hatchery as well, after the incubation process, the average daily water temperature is lower than 4 °C, 2 days for a water, such as the average daily water temperature 5 °C - 8 °C, usually one day for water 1-2 times. The fertilized eggs cannot overlap in the hatchery tray. Otherwise, they will die of hypoxia or developmental malformations. The water depth of the hatching plate is about 5 cm. The hatching room should not be exposed to direct sunlight or dark rooms.
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