After the goldfish lays eggs, take out the fish nest attached with the fish eggs in time to avoid swallowing them, dry them and put them in a container with the same water temperature as the original tank. After 24 hours, unfertilized fish eggs will turn milky white and should be removed in time to avoid worsening water quality.
The hatching time of golden croaker eggs varies with the water temperature. Generally, it takes 3-7 days from spawning to hatching. If the average water temperature is 15-20℃, the incubation time is 5-7 days. When the average water temperature is 20℃, small fish can hatch in 4-5 days; When the average water temperature is 20-25℃, it only takes 2-3 days. In short, the lower the water temperature, the longer the incubation time.
The pH value of the water in the incubator should be around 7.5, preferably not more than 8 and not less than 7.2. Special attention should be paid to keeping enough dissolved oxygen in the water in the incubator. If possible, an oxygenation pump should be installed, but the oxygenation intensity should be slow and weak. Should not be too fierce, so as to avoid excessive turning of water in the pool (tank), affecting the development of fish eggs and fry.
Extended data:
Breeding skills of goldfish;
(1) By selecting 1-2-year-old male fish and 2-4-year-old female parent fish, adopting the method of feeding male and female separately, reasonable stocking density, strengthening the feeding of high-protein feed and animal and plant bait, maintaining suitable water temperature, sufficient illumination and fresh water quality environment, and strengthening the prevention of parent fish diseases, it is beneficial to improve the brooding ability of goldfish.
(2) The fertilization rate of goldfish can be improved by adopting the male-female ratio of 1: 1 ~ 3 and distant mating as far as possible; At the same time, choosing sunny weather, suitable fish nest and using flushing stimulation can improve the spawning amount of goldfish.
(3) The natural breeding method of goldfish is the easiest to operate, and it is easy to implement in batch breeding production, and it can avoid the damage of artificial breeding to parent fish and greatly reduce the postpartum mortality of parent fish. Artificial reproduction is relatively complex and has a large workload, but the amount of eggs laid is obviously higher than that of natural reproduction.
Among the three artificial insemination methods of artificial propagation, wet insemination reduces the damage degree of parent fish to the greatest extent, and the fertilization rate is high, while the fertilization rate of artificial gynogenesis is relatively low. At present, the development of artificial gynogenesis is in the research and experimental stage, but its offspring can obtain the excellent characteristics of the genetic matrix, with high purity and good development prospects.