Production practice has proved that choosing a good broodstock is the key to the success of artificial breeding fry. With the increase in the number of breeding, the broodstock declines year by year, so new and new ones should be replaced each year. Therefore, some female fish older than 2 years old or male fish can be reserved in adult fish ponds in advance and reserved as broodstock. After that, male and female fish should be allocated accordingly. The key to staying selected is:

Selection time: It is best to select broodstock before the Spring Festival (ie when a large number of adult fish are harvested). At this time, the choice of broodstock due to reduced food intake of fish, activities are slow, tight scales, not easy to hurt.

Election and retention age: The sexual maturation age of farmed fish is generally 3-4 years for carp, 4-5 years for carp and grass carp, 2 years for carp, and 6 years for carp.

Selected to stay in physique: to choose a healthy physique, complete scales fins, no disease, no traumatic fish as broodstock.

Choose to stay weight: The bigger the broodstock is, the more eggs or the amount of sperm is stored. General broodstock weight selection criteria are: 3-4 kg of carp, 8 kg of carp, 7 kg of grass carp, more than 1 kg of carp.

Selected ancestral relationship: If mating with the offspring of the offspring of the same broodstock, their offspring will grow slowly, become ill, and the yield will decrease. Therefore, females and males used for breeding broodstock should come from different places, and the distance between the two places should be as far as possible.

Selection of Gonadal Development: When selecting ancestors, the development of gonads (ovary or testis) must reach the third stage. There are two ways to observe:

From the appearance, there are obvious ovary bulges on both sides of the abdomen; the autotrophic fish can choose several representative anatomies. It can be seen that the ovary grows on both sides of the abdominal cavity and is gray-blue. In winter, it is better if the ovaries are more than 2 cm wide and 15 cm long.

Select males and females: The ratio of male and female fish should be appropriate, generally 1 to 1, males can not be too much.

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