Rice field culture of Penaeus vannamei

The cultivation of Penaeus vannamei in paddy fields is a systematic project that makes full use of the resources of paddy fields and improves the ecological benefits and economic benefits of rice fields. It has the advantages of low investment, quick returns, and large profits. Now the relevant technologies are introduced as follows: I. Paddy field selection and engineering construction 1 . Paddy field chooses paddy fields with sufficient water sources, good water quality, no pollution, and convenient drainage and irrigation. The area is appropriated from 2 mu to 3 mu, and the sediment is sandy sediment. 2. The field project includes ring ditch, field ditch, and holding pond. The ditch is excavated along the inner side of the field ridge and requires a groove width of 1 meter and a depth of 0.8 meters. The field ditch is connected with ring ditch and paddy field, and depending on the size of the paddy field, it is dug into a horizontal ditch or "10" and "well" ditch. The ditch is 0.8 meters wide and 0.8 meters deep. The holding pond is used for paddy field fertilization, temporary storage of white shrimp during application, and harvesting of commercial shrimp, with a specification of 3m 2m and 1m, located in front of the outfall of rice fields or in the middle of a paddy field. The total area of ​​ring ditch, field ditch, and holding cradles accounts for about 15% of the paddy field area. Tian Yan base widened l meters to 1.5 meters, heightening 0.5 meters to 1 meter. The top of the field is surrounded by a plastic film and has a height of 1 meter. It prevents both the escape of the white shrimp and the terrestrial rats, snakes and frogs. The water inlet pipe is made of PVC plastic pipe with a diameter of 20cm. Both ends of the pipe are covered with a sieve. The drain outlet is surrounded by a sieve. The bottom of the sieve is buried 15cm above the bottom and the upper end is 50cm above the water surface. Both sides are embedded. Tian Hao 10 cm. 3. The shady shed is 1 meter away from the ridge, and every 3 meters (1.5 meters high) is used to build a ring of melons with mahogany. The field pods are grown with melons and gourds, and the vines are added to the shelf to provide shade. Second, shrimp stocking 1. The varieties of rice were selected to be resistant, resistant to lodging, and resistant to disease. 2. Pre-planting preparations (1) Disinfection of paddy fields, 10 days to 15 days before planting, about 50 kg of lime per acre; (2) Salt water and fertilizer applied at field level, water injection for 50 cm to 80 cm 7 days before planting , 50 kg of salt per acre evenly spilled in the field, and then fertilize the culture of food organisms, per-mu Fermentation of human and animal manure 200 kg to 300 kg. 3. Shrimp seedlings must be hatched after the hatchlings have been treated with strict desalination. When the seedlings are released, they must be tested for water. Safe and non-toxic shrimps can be used after they are released. (1) The seedlings with a length of 1 cm to 1.5 cm in length are preferred; (2) 10,000 to 20,000 tails per acre; (3) The most suitable temperature for the survival of Penaeus vannamei is 22°C to 35°C. The seedlings were released before the beginning of May. Third, feeding and management 1. Water quality control During the early period of cultivation, the transparency of the field water is maintained at 25 cm to 40 cm. During the middle and late breeding period, the transparency of the field water is maintained at 35 cm to 60 cm. In order to ensure high dissolved oxygen, new water should be frequently added. 2. Day-to-day management (1) Adhere to the field daily morning, evening and evening, observe changes in water color in the ditch and shrimp eating conditions to determine the amount of bait and add fresh water; (2) Check whether the inlet and outlet screens are firm and remove the filter. (3) When applying chemical fertilizers to rice, the shallow field water can be discharged first, and the shrimps can be concentrated in the ring ditch, field ditch, and holding pond, and then fertilized, so that the chemical fertilizer can be quickly deposited in the bottom mud, and the mud can be obtained. The absorption of rice bran will immediately deepen the field water to normal depth. (4) Pay special attention when applying pesticides. Strictly grasp the safe use concentration of pesticides and adopt the correct method of medication to ensure the safety of white shrimp. At the time of application, the first row of shallow field water was used to induce the shrimp to the ring ditch, field ditch, and holding pond, and then pesticides were applied. After the medicine disappeared, the field water was deepened to normal depth.