The correct way to feed shrimps

1. Juvenile shrimp: Add 0.4 to 0.8 kg per ton of feed (survival rate increased by 50%). Use time: throughout the breeding period.

2. Adult shrimp: Add 0.24 kg per ton of feed (survival rate increased by 45%, shrimp diseases significantly reduced) Usage time: 2 months before fishing.

3. Shrimp production: Add 0.75 to 1.5 per ton of feed (40% increase in spawning). Usage time: 2 months before spawning.

4. Breed selection: Select 100 shrimps that are strong, disease-free and injury-free, with a size of 20 to 50 grams and a male to female ratio of 1:1 as broodstock. The selected broodstock will be raised in a covered area. In a 6 × 8 × 1 meter cement pond with fiberglass tiles and heating system, freshly cut "lobster" heads are fed every day at 10% of the body weight of the pond shrimp. The outer front part of red crayfish is red and brightly colored, and the claws are longer than the body length; the claws of female shrimps are basically blue and the length is shorter than the body length. The genital process of mature male shrimp is obviously rod-shaped at the base of the fifth step; the genital pore of female shrimp opens at the base of the third step. Put some washed and disinfected mesh into the broodstock breeding pond as a shelter for the broodstock, suck up dirt and change the water every day, and keep the lighting 12I:12D (12 hours of light, 12 hours of darkness).

5. Spawning: Broodstock begin to mate and lay eggs in late April. The mating of red-clawed crayfish is soft-shell mating. Before mating, the female shrimp must undergo reproductive molting. The female shrimp begins to lay eggs within 12 hours after the male shrimp produces sperm. The eggs produced by female shrimp turn dark yellow after fertilization and adhere to the hollow formed by the abdominal legs and the inward curling of the tail fan. An egg-bearing shrimp weighing 48 grams can hold 326 eggs. The shrimp with a high egg number can hold 441 eggs, while the shrimp with a low egg number can only hold 27 eggs.

6. Embryonic development: The fertilized eggs of red crayfish are dark yellow, and gradually change to yellow-orange, red-orange, and light gray as the embryo develops. The embryonic development comparison test of the egg-bearing shrimps was divided into 4 groups and it was found that the embryonic development of red crayfish eggs was extremely slow at 19°C; at 21-23°C, the hatching time was 41 days and the hatching time was 80 days. The young shrimps separate from the mother; at 26°C, the fertilized eggs hatch out of the membrane in 30 days, and the young shrimps separate from the mother in 52 days; at 29 to 30°C, the eggs hatch out of the membrane in 25 days, and separate from the mother in 40 days.