The new amount of shrimp is commonly known as “base shrimpâ€. Its shell body is thin and the meat is delicious and refreshing, which is better than Chinese shrimp. The domestic and foreign markets are very popular. It is a wide temperature, salty shrimp. The temperature range is 10～35°C, autumn water temperature can be reduced to 6～7°C and it can survive. The best growth temperature is 17～32°C. It can adapt to the salinity range 0～35‰; the endurance to hypoxia is stronger than that of shrimp, and it can be PH7. .0 ~ 9.0 normal life in the water. Its feeding habit is omnivorous animal feeding. The larvae have the same feeding habits as prawn. During the prawn feeding period, they mainly eat copepods and polychaetes. They also feed on artificial diets and other organic detritus and benthic organisms. The habits lurk in the bottom silt and water grass. Now we will introduce the technology of paddy field cultivation of new prawn (hereinafter referred to as girth shrimp) as follows: I. Paddy field selection Paddy fields are required to be close to the upper and lower drains, with sufficient water supply, good water quality, smooth drainage and irrigation, and convenient transportation. Specific requirements are as follows. 1. Conditions: The shrimp-raising paddy fields are basically similar to the paddy-field crab-rearing area, with 2-5 acres being the best and the largest being less than 10 acres. 2. Field project: Digging of “mouth†and “king†type gutters around the paddy field where the shrimp is established, with a ditch depth of 0.8 to 1 m, a width of 1 to 1.5 m, and a shrimp ditch occupying 15% of the paddy field area, from the ditch Take the land widen and increase the height of the surrounding embankments, and the double-layer anti-escape nets shall be installed at the entrance and exit of rice fields. Second, prepare for seedlings Qing Tian: For the ploughed fields, 50-75 kg of lime per acre was used to kill Tanaka's wild fish and bacteria. 2. Cultivate basic bait: After 7-8 days in Qingtian, the paddy field water level is stable at 5 to 10cm. Select 200 to 300kg of organic fertilizer in the sunny morning, 3kg of urea, 5kg of superphosphate, and splash the whole pond to cultivate the biological feed in the field. 3. Rice planting: Rice varieties are selected for high yield, good quality lodging and disease resistance. The transplanting method is the same as that of ordinary rice fields, and the number of holes per acre is not less than 15,000. After the seedlings have returned to green, shrimps will be used. Third, seed delivery 1. Shrimp desalination: At present, most of artificially-cultured shrimps are produced in factories, and the proportion of seawater in hatchery seedlings is generally about 1.015 to 1.020. To move to freshwater culture, first of all, desalination, and the cultured shrimps should be reduced to 1.002 to 1.003 or less. Move into paddy fields for breeding. 2. Seed quality: shrimp body length of 0.7 ~ 0.8cm, physical fitness, body surface brown and clean and tidy. When the seedlings are supplied, the water temperature in the pool is similar to the outside temperature, and the temperature difference does not exceed 2 to 3°C. 3. Shrimp stocking and stocking time: 3-40 thousand tails per acre of paddy fields, no more than 50,000 tails. Fourth, feeding and management 1. Feeding: After one month of shrimp ponds, they mainly eat plankton in paddy fields, grow to 2~3cm one month later, and feed with artificial diet pellets (prawn feed). The daily feed amount is 5 ~ 6%; if the water temperature reaches 24 ~ 30 °C, the basic shrimp around the food intake, daily feeding increased to 8 to 10%. 3 to 4 shots per day, and more than 40% of the whole day's feed is eaten in the evening. If there are conditions, plankton and wild fish are used as auxiliary feeds from outside waste pits or rice fields. It is advisable to eat shrimp for 2 to 3 hours each time. 2. Water level control and water quality management: The early feeding water level of shrimps is kept at about 5cm, and the water level of rice seedlings gradually deepens. The medium water level must not be less than 10cm. The water quality is fresh and the fatness is moderate. The transparency of shrimp farming is 35-40 cm, and the water color is light green. Lime once every 20-25 days, 7.5-10kg per mu. Fresh water quality and relatively stable physical and chemical factors are important guarantees for the growth of shrimp moltings. Compared to fish, shrimps require higher water quality than fish, and they are more sensitive to water pollution. It is known that when the water-soluble oxygen per litre is in the range of 8-9 mg, the growth of the shrimp around the base can be promoted, and when it is lower than 3-4 mg, it is not conducive to growth. The pH value of the shrimp around the base is between 7 and 9. When it is less than 7 or less, it is not conducive to molting. Change the water every 2-3 days in the hot season. The amount of water to be changed is 1/2 of the paddy field, especially in the rainy season, the amount of exchanged water should reach 1/3 or more, and the lack of oxygen should be strictly prevented. 3. Disease prevention and control: adhere to the principle of prevention, prevention and treatment. During the whole breeding period, the lime was regularly splashed 5 times, each time in an amount of 10-15ppm, to kill bacteria and drive off the enemy. At the same time, the timely addition of calcium is beneficial to the growth of shrimp molting. 4. Do a good job in recording: Establish records and management systems from seedlings to fishing. Daily records of temperature, water temperature, water change and water injection, shrimp growth rate, and feeding conditions were found and problems were solved in time. V. Collection and collection time of harvested shrimps: The growth situation and market demand of shrimps are mainly considered. Generally in the paddy field cultivation 90 to 110 days can be grown to 8-10cm commercial shrimp. During the rice ripening season. At this time, the shrimp can be harvested and harvested after the shrimp is harvested. The common collection methods are as follows. 1. Harvested shrimp into the cage: In the evening, the cage will be placed under the shrimp ditch in the paddy field, and the cage will be harvested in the morning the next morning. Each cage can receive 0.5-1 kg, and 25-30 cages per mu can be obtained. 2. Pull nets to catch shrimp: Put the paddy field water into the side ditch, and then use a small pull net to pull the net in the paddy field ditch. General continuous pull 3-4 network. The catch rate reached 40 to 50%, and the netting time was in the evening. 3. Dry field water collection shrimp: When the water temperature at 10-15 °C shrimp stop feeding and growth, when the rice field through the above two methods of arrest, the remaining number is not much, can be dry trunk ditch water dry law collection.
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