1. The parental selection and parental traits are good, the number is sufficient, and the gonadal development is good. It is the basis for the successful propagation of the artificial breeding of the allogynogenetic crucian carp and the quality of the seedlings.
1.1 Parental Selection Parental selection of Founder Silver Juvenile or its hybrid offspring (Alternative Silver Jubilee) was selected as follows: Sideline scales 30 to 32, appearance shape: small head, high body height, thick back, strong physique, no injury, illness , residual, age 2 to 3 years old, weight more than 250g, slightly enlarged belly. When choosing, you should pay attention to removing males, and do not use other bugs as your choice.
The father chose Xingguo Red Dragonfly and Jianye. The selection criteria were: body length, height, back thickness, strong appearance, no injury, illness, and disability. Age 2 to 3 years old, weight 500 to 1000g, slightly yellowish white semen Outflow. It is strictly forbidden to mix females.
Parent selection time: 10~12 months.
Planned seedling propagation and parental selection: In order to reproduce the 1 million rearing crucian carp, as an example, 150 to 200 kg for the first maternal parent and 100 to 150 kg for the maternal parent should be halved.
1.2 Parental Nurturing
1.2.1 The cultivation pond area is 1000~2000 square meters, the water depth is 1.5~2m, the bottom of the pool is flat, there is less sludge, drainage and irrigation are convenient, and no leakage occurs. The cultivation pool needs to be thoroughly cleared before the stocking of the parents. When the water is infiltrated, it must be strictly filtered to prevent the infestation of various wild fish and remove the weeds from the pond to prevent the brooders from spawning themselves.
1.2.2 Parent stocking and breeding Parent stocking densities are 2000-3000 kg/sq. hectare, and paternal stocking densities are 2500 to 3500 kg/sq. ha. Parents and fathers are nurtured in separate pools for specialized feeding and management.
Autumn and Winter Breeding: Broodstock is intensively cultivated from the autumn to promote its gonad development. The feeds fed are bean cakes, wheat, and pellet feeds. The particle size of the pellets is suitable for the degree of palatability. Soybean cakes and wheat are better for soaking and feeding. The daily feed is 3% to 5% of the total weight of the fish. After winter, the feeding amount should be reduced, and the daily feeding amount is 1%~2% of the total weight of the fish body, and it can be slightly increased when the weather is fine. Spring cultivation: After spring, the daily feed is fed at 3% to 5% of the total weight of the fish, and it increases as the water temperature rises, and appropriate new water is added to promote the development of the gonads. Water injection is stopped during the breeding period (15d), otherwise it is easy to induce miscarriage.
Postpartum cultivating: Postpartum broodstock is weak and requires intensive care. Fresh water quality is required, the feed quality is good, the amount is sufficient, digestion is easy, and the environment is quiet.
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