In the fertilized egg of a goldfish, the egg membrane swells quickly, causing the egg to take on a slightly yellow and translucent appearance, signaling the start of embryonic development. If the eggs become cloudy and eventually turn white, this is an indication that they are unfertilized and will not hatch.
The hatching process is highly influenced by environmental conditions, particularly water temperature. The incubation period and hatching success rate are closely related to external factors. Among these, water temperature plays the most critical role. Goldfish eggs should be kept in a temperature range of 18°C to 30°C, with the ideal range being 20°C to 22°C. Under these optimal conditions, fertilized eggs typically hatch within 3 to 4 days. However, if the water is too warm, the embryos may develop too quickly, leading to deformities and lower survival rates. Conversely, if the temperature is too low, development slows down, which can also result in poor hatching outcomes. Sudden temperature fluctuations during incubation can severely disrupt embryonic development, often leading to high mortality rates.
In addition to maintaining the right temperature, it's essential to ensure good water quality. This includes keeping dissolved oxygen levels high and maintaining a stable pH. These factors are crucial for the healthy development of the embryos.
During the hatching process, several important steps must be followed. Fertilized eggs should be moved to the hatching tank within 1–2 hours after spawning, and the temperature difference between the new and old environment should not exceed 2°C. The water in the hatching tank must be clean, well-oxygenated, and free from harmful pests or contaminants.
It’s also important not to disturb the fish nest. The nest and the eggs should remain fully submerged throughout the incubation period. Once the yolk sac is completely absorbed, the fry should be left undisturbed for 1–2 days until all of them are able to swim freely on their own, a stage known as “off the nest.â€
Throughout the entire incubation period, avoid changing the water or agitating it, as this can interfere with the embryo’s development and lead to abnormalities or even death. Maintaining a stable and calm environment is key to ensuring successful hatching and healthy fry.
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