The cultivation of fresh shrimps in the early rice fields can not only improve the ecological environment of rice fields, but also increase production and income, and it is a very promising breeding mode. As long as we adhere to local conditions, strictly in accordance with the technical specifications, and effectively strengthen the feeding management, the early rice paddies raise the green shrimp, while maintaining the stability of rice production, but also can obtain yields of 20-30 kilograms of green shrimp production, and achieved relatively good economic benefits. The main operating technical points are:
First, choose a good field, open a good shrimp ditch. Early rice fields cultivating fresh shrimp require 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 should be stocked after the rice seedlings turn green (about one week after transplanting). Normally, juvenile shrimp artificially cultivated in the year of stocking are stocked. The specifications are 2000-5000/kg, and 1 to 15,000 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, the movement should be agile. After stocking, add irrigation water to keep the water depth of rice paddies at 15-20 cm. Pay attention to keeping the water level stable at ordinary times and avoid shallow water to affect swimming and growth of shrimp.
Third, scientific investment, strengthen management. After juvenile larvae are stocked, they start feeding immediately and generally can use bran, soybean cake or fish (shrimp) to feed with pellets. Some animal feed such as snails, shellfish and fish should also be fed properly. Feeding twice a day, feeding mainly in the evening, the daily feeding amount can be grasped at 2% to 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 To promote growth. In the field management of shrimp in the rice field, it is necessary to emphasize the following points: 1. Adhere to regular water changes to keep the paddy field fresh. 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. As far as practicable, pesticides should be avoided in shrimp farming rice fields. If necessary, some pesticides with high efficiency, low toxicity and low residual pesticides should be selected. 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 and fresh water should be replaced 5 to 6 hours after application to prevent pesticide residues and harm the shrimp. 3. Pay attention 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 juveniles can reach sexual maturity after 2 to 3 months of breeding, and breed in the pool with excessive density. The uneven size of individuals is not conducive to the growth of shrimp. Therefore, fishing can be staged from September onwards, catching up to stay small. 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 directly marketed for sale. Smaller individuals can be stocked separately until May-June next year.
Fifth, winter shrimp, to ensure safety. Winter shrimp is divided into two types: wintering of larvae and wintering of broodstock. The overwintering of juvenile shrimps refers to those shrimps that have been breeding from August to September. Until December, they have not grown up to commercial specifications. Through wintering, they are reserved for stocking in the third and fourth months of the following year. The broodstock that was selected to be kept for breeding in the coming year should be allowed to safely pass through the winter and be intensively cultivated to meet the spawning requirements. Therefore, it is an important part of the development of shrimp aquaculture to ensure the wintering of shrimp.
First, choose a good field, open a good shrimp ditch. Early rice fields cultivating fresh shrimp require 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 should be stocked after the rice seedlings turn green (about one week after transplanting). Normally, juvenile shrimp artificially cultivated in the year of stocking are stocked. The specifications are 2000-5000/kg, and 1 to 15,000 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, the movement should be agile. After stocking, add irrigation water to keep the water depth of rice paddies at 15-20 cm. Pay attention to keeping the water level stable at ordinary times and avoid shallow water to affect swimming and growth of shrimp.
Third, scientific investment, strengthen management. After juvenile larvae are stocked, they start feeding immediately and generally can use bran, soybean cake or fish (shrimp) to feed with pellets. Some animal feed such as snails, shellfish and fish should also be fed properly. Feeding twice a day, feeding mainly in the evening, the daily feeding amount can be grasped at 2% to 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 To promote growth. In the field management of shrimp in the rice field, it is necessary to emphasize the following points: 1. Adhere to regular water changes to keep the paddy field fresh. 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. As far as practicable, pesticides should be avoided in shrimp farming rice fields. If necessary, some pesticides with high efficiency, low toxicity and low residual pesticides should be selected. 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 and fresh water should be replaced 5 to 6 hours after application to prevent pesticide residues and harm the shrimp. 3. Pay attention 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 juveniles can reach sexual maturity after 2 to 3 months of breeding, and breed in the pool with excessive density. The uneven size of individuals is not conducive to the growth of shrimp. Therefore, fishing can be staged from September onwards, catching up to stay small. 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 directly marketed for sale. Smaller individuals can be stocked separately until May-June next year.
Fifth, winter shrimp, to ensure safety. Winter shrimp is divided into two types: wintering of larvae and wintering of broodstock. The overwintering of juvenile shrimps refers to those shrimps that have been breeding from August to September. Until December, they have not grown up to commercial specifications. Through wintering, they are reserved for stocking in the third and fourth months of the following year. The broodstock that was selected to be kept for breeding in the coming year should be allowed to safely pass through the winter and be intensively cultivated to meet the spawning requirements. Therefore, it is an important part of the development of shrimp aquaculture to ensure the wintering of shrimp.
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