Putting crawfish (Cang's crayfish) in Putian is a good model for planting and combining. To raise crayfish in lotus field, the following points should be noted:
1. Putian choose to breed crayfish in Putian, should be sufficient water, good water quality, no upstream industrial wastewater pollution, but also deep soil, fertile soil, good light, water depth, convenient irrigation and drainage, dry water, Not submerged.
2. After digging the trenches and shrimp pits, select the base fertilizer and pay attention to applying more organic fertilizer. When the pond mud becomes hard, depending on the size and shape of the paddy field, the “field†shape or “me†shape shrimp ditch is excavated, and the ditch is 50 to 60 cm wide and 30 to 40 cm deep. Dig a few larger shrimp pits at depths of 80 to 100 cm at the cross of the shrimp ditch or in the field, and excavate the mud to increase the height of the pond. Shrimp trenches and shrimp pits are excavated in order to provide lobsters with shelter and hiding places at high temperatures, shallow irrigation, topdressing, and pesticide application.
3. Set up anti-escape facilities The inner side of the farmland of Cangcang, which raises crawfish, must be surrounded by rigid plastic plates or asbestos tiles. The bottom of plastic plates or asbestos tiles should be buried in the soil for 20 cm, and the soil surface should be exposed to more than 50 cm. fixed. In the inlet and outlet of Putian, bamboo foil, wire mesh and other anti-escape facilities should be installed to prevent crayfish from escaping.
4. Crayfish stocking and feeding 10 to 15 days before stocking shrimp, 667 square meters of paddy field with 10 to 15 kg of calcined water splashed throughout the field, focusing on Putian shrimp pit, shrimp ditch disinfection. After the first leaf is grown in the lotus root, the shrimp is injected, and about 667 square meters of about 2000 shrimps of about 2 cm in size are released. The seedlings were fed on the third day after stocking, and the feeding amount was based on the amount of natural food in Putian and the stocking density of crayfish. It is advisable to pull out part of the loquat leaves as a feeding area in a shallow water area near the shrimp ditch and shrimp pit, and to feed them regularly, according to the local resources, to feed rice bran, bean cake, bran, compound feed or Minced fish, snail meat, clams, cocoons, slaughterhouse waste, etc. Feeding quantity should follow the principle of “less before, more during, and less afterâ€. The temperature in the early and late periods is relatively low. The shrimps have small food intake. Therefore, they are advised to invest less. Normally they are fed before and after sunset, and they are fed again on the morning of the next day according to the feeding situation. The daily feed is 1% of the shrimp body weight. 3%; mid-term (June-September) water temperature is appropriate, it is the crayfish feeding and growing season, it should be more vote, feeding 2 to 3 times a day, usually at 9 to 10 am and before and after sunset or night feeding, Daily feeding is 5% to 8% of shrimp body weight. In addition, when the weather is fine, they can make more investment. When the temperature is hot and the weather is hot and rainy, or when the water quality is poor, the investment should be less; After each feeding, the shrimp should be observed carefully and the amount of feeding should be adjusted flexibly.
5. Water management The crayfish are kept in Putian, and shallow water should be poured in the initial stage. The water depth is about 10 cm. With the growth of cockroaches and shrimps, gradually deepen the field water to 15-20 centimeters. In the vigorous growing season of lotus root, due to the water surface being covered by the loquat leaves, the lack of water in the water body, coupled with the deterioration of the quality of the water after the topdressing in Putian, it is easy to cause the lack of oxygen in the water body. Therefore, in the water layer management, it is necessary to regularly add water and drain part of the old water, every 15 Change the water once in 20 days, and change the amount of water for each 1/3 of the original amount of water in Putian. At the same time as changing water, lime water is splashed once every 20 days, and 667 square meters of lime are used for 10 kg each time. On the one hand, water quality in Putian is improved and dissolved oxygen is increased. On the one hand, calcium ion content in water is increased and crayfish are promoted. Shell growth.
6. Fertilization management Putian cultivated crayfish, pay attention to the coordination of the relationship between the growth of lotus root and crayfish growth in fertilization, base fertilizer to organic fertilizer, 667 square meters of fermented farmyard fertilizer about 2000 kg, try to control chemical fertilizer Dosage. Top dressing should adopt "a small amount, multiple times," half the first, half after the application, alternating fertilizer method to reduce the impact on the growth of crayfish. In addition, the top dressing should pay attention to the weather conditions. When the temperature is low, it can be used more appropriately. When the temperature is high, it should be less.
7. Disease prevention and pest control Crawling crayfish in Putian, the best conditions to install frequency vibration type insecticidal lamp, not only can kill pests, reduce the amount of pesticides, insects can also be killed for lobster consumption. When pesticides are required, they should be selected as high-efficiency, low-toxicity, low-residue pesticides (such as Roche Benton, Qujing, BT emulsion, etc.) that are less toxic to crayfish and deepen the water level in the field when applying pesticides. Half of the paddy fields are left, and the remaining half is sprayed for 2 to 3 days to allow the lobster to rotate and hide to ensure safety.
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