Rice field shrimp high efficiency
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First, choose a good field, open a good shrimp ditch. The paddy field where shrimp is farmed requires fresh water and stable water levels. For this purpose, it is necessary to choose a land that is close to the water source, is convenient to enter and drain, and has a good soil quality. After turning over and leveling, it is possible to excavate a shrimp ditch 2 meters wide and 1 meter deep at the end of the field or in the middle of the field and in the middle of the field. A shrimp ditch that is 1 meter deep and 0.8 meter deep. Build a drainage system and fill it with water to prevent wild fish from mixing.
Second, timely planting, increase survival rate. Shrimp species should be stocked after the rice seedlings are returned to green, usually the juvenile shrimps that were artificially cultivated in the year of stocking, the specifications are 2000-5000/kg, and 1-155,000 tails can be planted per acre. Select the rainy morning or sunny morning, the sub-points, so that the entire water distribution of juveniles, to avoid excessive concentration of larvae due to lack of oxygen caused death. When stocking is carried out in the rainy or sunny morning, the sub-points will be distributed so that there will be a distribution of juveniles in the entire water area, so as to avoid excessive concentration of juvenile shrimps due to lack of oxygen. When stocking, the movement should be agile. After stocking, add irrigation water to keep the water depth of the paddy field at 15-20 cm. Pay attention to keeping the water level stable at ordinary times, so as to avoid shallow water affecting shrimp swimming and growth.
Third, scientific investment, strengthen management. After juvenile larvae are stocked, they start feeding immediately, and generally can use bran, bean cake, or fish (shrimp) to feed with pellets. Some animal feeds such as snails, shellfish and fish should also be fed properly. Feeding twice a day, mainly in the evening, the daily feeding amount can be controlled by 2% - 4% of the body weight of the shrimp, according to the season, weather and shrimp eating conditions, a reasonable adjustment, so that shrimp eat well, Promote growth. Management points: (1) Adhere to regular water changes to keep rice fields clean. Especially in summer and autumn, the high-temperature season requires even more water changes. Even when paddy rice fields are kept, the water level in the shrimp ditch must be maintained to provide a good ecological environment for the growth of the shrimp. (2) shrimp farms try to avoid the use of pesticides, if necessary, should choose some efficient, low toxicity, low residue pesticides. Its application method: powder should be applied in the morning, because there is dew in the morning, most of the powder is on the stems and leaves of rice; water agent afternoon spray, because the afternoon rice leaves are dry, most of the liquid is absorbed on rice. The field should be filled with water before application, fresh water should be replaced within 5-6 hours after application, to prevent pesticide residues and harm the shrimp. (3) Take care to clear the enemy. Frogs, snakes, water mice, etc. will all eat green shrimp, and they must take effective measures to eradicate them in time.
Fourth, the implementation of arrests, timely harvest. Early stocking young larvae can reach sexual maturity after 2-3 months of breeding, and breed in the pool with high density. The uneven size of individuals is not conducive to the growth of shrimp. Therefore, fishing can be staged from September onwards, catching small catches. Fishing methods include: shrimp cage trapping, shrimp trapping, fishing and catching the sea. By November, the growth of the shrimp has stopped, and dry ponds have been used to drain the paddy fields and catch net shrimp. Larger individuals can be listed and sold directly. Smaller individuals can be stocked separately until May-June next year.
Fifth, winter shrimp, to ensure safety. Over the winter, the shrimps are divided into two types: wintering of young shrimps and wintering of new shrimps. The overwintering of juvenile shrimp refers to those shrimps that were bred in August-September. Until December, shrimps that haven’t grown to commercial specifications will survive wintering and will be kept as stocking shrimp species during March-April of the following year. Select the broodstock to be kept for breeding in the coming year and allow it to safely pass winter to meet the requirements for spawning in the coming year.