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Incubation Techniques of Whitefish Fertilized Eggs
The fertilized eggs of the big whitebait need to be incubated at a low temperature to ensure proper development. The hatching process is relatively slow, and the eggs should not be moved until they reach the mid-stage of the original intestine. This ensures that the eggs are strong enough for transportation. The ideal water temperature for incubation ranges between 6°C and 7°C, and it typically takes more than 100 hours for the eggs to hatch. It usually takes about 30 days for the eggs to fully develop into fry. If the water temperature drops further, the incubation time will increase, so it's essential to maintain stable water conditions throughout the entire process. Maintaining sufficient dissolved oxygen levels is crucial for the development of the eggs and helps prevent the occurrence of fungal infections or other problems.
The water temperature should be kept between 1°C and 8°C. Water must not freeze, nor should it exceed 10°C, as both extremes can significantly reduce the hatching rate or cause developmental abnormalities. Sudden temperature changes should be limited to no more than 2°C. When changing the water, it’s best to use reservoir water that matches the current temperature to avoid shocking the eggs. Dissolved oxygen levels can be maintained by regularly changing the water. The frequency of water changes depends on the water temperature. For example, when the average daily temperature is around 3°C, it’s better not to move the hatchery at all. Once the incubation period begins, if the average daily temperature is below 4°C, water should be changed every two days. If the temperature is between 5°C and 8°C, one to two water changes per day are recommended.
It's important that the fertilized eggs do not overlap in the hatching trays, as this can lead to hypoxia or developmental issues. The water depth in the hatching tray should be approximately 5 cm to provide enough space and oxygen flow. The hatching room should be kept away from direct sunlight and should not be too dark, as moderate lighting helps monitor the development of the eggs. Proper care during this critical stage ensures higher survival rates and healthier fry.