Artificial breeding technology of crayfish cement pool

1. Reproductive pond preparation: A number of small ponds are to be built. Each small pond has an area of ​​about 4 square meters and a depth of 70 cm. Each square meter breeding pond before stocking broodstock is thoroughly disinfected with about 200 grams of quick lime, and the new cement pond is first alkali-sterilized and then disinfected.
The depth of the cement pool is generally maintained at 50-60 cm. At the bottom of the pool, artificial nests are built with asbestos tiles and red bricks. Cover the shade cloth above the concrete pool. The water hyacinth was stocked in the pond and covered 2/3 of the water surface. Configure the corresponding aeration facility.
2, broodstock selection: Select broodstock generally carried out in June-August, requiring broodstock individuals in 40 grams / tail or more, physical health, appendages complete, bright color, body surface disease-free without injury.
3, broodstock launch: long-distance transport of broodstock, broodstock before soaking in the pool water for 3-5 minutes before soaking, and then placed in the poolside 2-3 minutes, so repeated 2-3 times, so that the squid sucking After the water, slowly put it around the pond into the pool. There were 40 broodstock per square meter with a ratio of 1:1 male to female. At the same time, the stocked broodstock should have the same specifications.
4, broodstock cultivation: broodstock before breeding requires intensive cultivation to supplement the shrimp body nutrition and promote gonadal development. It is generally fed animal feeds with high protein content (such as fish gills, fish guts, and animal waste), supplemented with plant feed (such as soybean meal, bran bran, etc.), and the ratio of animal feed to vegetable feed is 1:1 or 3:2. Normally, it is fed once a day at about 5 pm and the feeding rate is 3-5%.
5, water quality management: breeding pool change the water every 3-5 days. If the shrimp pond water quality is poor, drain the pool water and clean the shrimp pond. When the water body lacks oxygen, aerators should be aerated in time.
6, fertilization and hatching: broodstock after intensive cultivation, in September when the water temperature reached 18 °C when the mating, about mid-October in order to lay eggs. When the water temperature is 18-20°C, the incubation period of fertilized eggs is 30-40 days, and the water temperature is only 15-20 days at 25°C. When a large number of juvenile shrimps were found in breeding ponds, seedlings should be harvested in time.
7. Shrimp cultivation: The shrimps that are harvested are transported in time to the shrimp cultivation ponds. Shrimp cultivation ponds are preferably cement ponds with an area of ​​20-40 square meters and a water depth of 1 meter. It is also possible to choose a soil pond with an area of ​​1-3 acres, a slope ratio of 1:2, and a water depth of 0.5-1 meter. Each mu of cooked human and animal manure 500 kilograms, cultivate natural feed. A certain number of aquatic plants (water peanuts, water hyacinth, etc.) are placed in the pond for the inhabitation, shelling, and concealment of young shrimp.
Choose to put juvenile shrimp on a sunny day morning or cloudy day and place 150-230 tails per square meter. Feeding soy milk for the first week after stocking, feeding 3-4 times a day; feeding animal feed such as small fish and shrimp, snail meat, cockroach and silkworm cocoon in the second week, with the appropriate mix of corn, wheat, fresh plants, stems and leaves The paste-like feeds obtained by mixing and comminution are fed one at a time in the morning and evening and 70% in the whole day at night. The amount of daily feeding for juvenile shrimp is 250-400 grams per day, and it will be fed at about 10% of the weight of shrimp in the pond. During the cultivation process, the water is changed once every 7-10 days, and the water is changed by 1/3 each time. Every 20 days, about 20 grams of lime slurry per cubic meter of water is poured evenly on the entire pool.
The larvae are incubated 25-30 days, grow 5-8 times, grow in shells, and grow up to 3 cm in length. Shrimp seedlings can be transported to the earth ponds in the ponds in April next year for routine breeding.

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