High efficient Culture Technology of Shrimp in Rice Field

River shrimp, which is widely distributed in rivers, lakes, reservoirs and ponds in China (also known as river shrimp, scientific name Macrobranchium nipponense), is a high-quality freshwater shrimp. Tender meat, delicious taste, rich nutrition, is a high-protein and low-fat aquatic food, quite favored by consumers. The market demand for river shrimp is growing day by day, the best-selling is not declining, and the price is more expensive. In the case of a sharp drop in the prices of many famous and high-quality fish, such as sea bass, sweet-scented osmanthus, eel, soft-shelled turtle and Sturgeon, river shrimp prices are still very strong. So how to raise river shrimp in rice fields? Now I would like to introduce to you.

Culture conditions of river shrimp in paddy field

1. Environment. The water quality is fresh and pollution-free, the pH value is about 7, and the dissolved oxygen should not be less than 4 mg / L, keeping it fresh, alive, tender and cool. It is required to choose ponds with good ventilation, close to water sources and convenient access to and drainage.

two。 Aquaculture pond. According to the shape of the field block, the trench is excavated into the shape of "field, sun and eye". The width of the ditch is 5 meters, the depth of the ditch is 0.8 to 1.2 meters, the slope ratio is 1 ∶ 2.5, the foot of the beach is larger, and the area of the ditch accounts for 20% / 25% of the area of the field. Seal the water outlet with 40 mesh mesh to keep the inlet and discharge unblocked.

3. Set up oxygenation facilities. Every 10 mu of rice field is equipped with a water pump or a 1.5 kilowatt impeller aerator.

Stocking of river shrimp seedlings in paddy fields

1. Get ready before stocking. Require first dry field exposure, and per mu with quicklime 75 kg water belt 10 cm water the whole pool sprinkled clear pond, and rake evenly with iron rake. About 15 days before stocking, the whole pond was evenly sprinkled with 75kg of quicklime per mu.

two。 Points for attention. Seven days before the shrimp seedlings went into the pond, 100 kg / mu of fermented human and animal manure and other organic fertilizers were applied to cultivate plankton. Aquatic plants can be transplanted or planted with Eloe algae, water leek, verticillium verticillata, etc., and the coverage area of aquatic plants is required to reach about 2 × 5 of the ditch area. Rice varieties should choose varieties with strong resistance to lodging, waterlogging and diseases and insect pests, such as Suxiangjing 1, 86 you 8 and Changyou 1.

3. Selection and stocking of shrimp species (seedlings). Shrimp species should adhere to water operation, the action should be light, shrimp species should not be stacked and pressed in the container.

1) stocking in spring. The shrimp species have a body length of 2.5 to 3 centimeters, with a specification of 2000 to 3000 per kilogram and 15 kilograms per mu. The requirements of the shrimp species are basically the same, with strong physique, strong vitality, no disease and no injury, clean body surface, complete appendages and full feet at one time. The stocking time is generally from December to February of the following year.

2) stocking in autumn. All the shrimp in the pond were released from the pond, and the shrimp seedlings were released after the medicine pond from July to August. 40,000 ~ 50,000 shrimp per mu with a body length of 1.2 to 1.5 cm should be released in the morning when the weather was fine.

3) the distribution of fish species. Mainly silver carp, bighead carp, silver crucian carp, forbidden to release green, carp and other carnivorous varieties. After one week of shrimp stocking in spring, silver crucian carp and silver carp were released, with 100 silver crucian carp and 100 silver carp per mu.

3. Rice is planted. Seedling transplanting or direct seeding with water or drought can be used. Direct seeding should pay attention to the sowing quality to ensure the whole seedling and fill the gap in time after sowing. Transplanting seedlings 10cm into the paddy field, planting 15000 holes per mu, row spacing 23.5cm, plant spacing 16.5cm, after the seedlings wake up barley, gradually add water to 40cm with the growth of rice.

4. Breeding and Management of Shrimp in Paddy Field

1) Water quality management. When the shrimp seedlings go into the pond, the water level should be kept above 1 meter, and fresh water should be injected every 2 to 3 days; in the summer high temperature season, water should be added around noon to promote water convection, lower water temperature and increase dissolved oxygen; from July to September, the water should be changed once every 7 days, about 20 cm each time. Regularly sprinkle 20 mg / L of raw lime water, photosynthetic bacteria and other biological agents can be used to strictly prevent the production of blue-green algae, the transparency of the water is 30-40 cm. If the water quality is too light, it needs to be topdressing in time. Inorganic fertilizer or compound fertilizer can be used for topdressing, the dosage is 5-8 kg per mu, depending on the water quality, in order to keep the water quality fertilizer, cool, alive and tender.

2) set up "shrimp nest". Water plants such as water peanut, water hyacinth and Malay were introduced into the pond from March to April. they were soaked in 8 mg / L ketone sulfate solution for half an hour before entering the pool. When moving into the pond, use ropes or bamboo sticks to fix several circles or triangles on the edge of the pond to avoid floating everywhere. Put 50 kilograms of aquatic plants per mu of water to let them grow naturally. When aquatic plants grow vigorously in summer, it will affect the air permeability of the water surface and the photosynthesis of phytoplankton, so weeds must be weeded and the shading area should not exceed 1 > 5.

3) feeding method. In the stage of shrimp seedling, plankton and organic detritus are used as bait, and a small amount of commercial feed such as wheat flour and wheat bran or special pellet feed for young shrimp can be fed. Shrimp seedlings grow to more than 2 cm, can be fed with artificial mixed feed, with crushed fish, snails, clam meat, earthworms and other animal feed with commercial feed. When the young shrimp grows to more than 3 cm, the feed protein content is required to be 30%, and the body length is more than 4 cm. The feed protein content is 28% and 30%. The amount of feeding is 10% of the total body weight of shrimp, and each month is: 2% from March to April, 3% from April to May, 5% from April to May, 6% from June to September, and 2% from October to December. according to the growth, feeding and weather conditions of river shrimp, increase or decrease the amount of feeding and feeding times to ensure the effect of feed utilization.

4) daily management. Fertilization in paddy field: 10 kg / mu of urea was applied at 7 days, 15 days and July 20, respectively. Inspect the shrimp 2-3 times a day, observe the growth of shrimp frequently, patrol the pond day and night in summer high temperature season, patrol the pond once every morning and evening, if you find the floating head of river shrimp at night or early morning, you must turn on the aerating machine and add new water: carefully check the condition of the pond mouth before and after wind and rain, remove mud moss, algae and other attachments in time: diligent maintenance, timely fill the ridge leakage and repair breeding facilities. Prevent rats, water birds and water snakes from entering the culture zone to harm river shrimp, prevent loopholes from forming water and causing river shrimp to escape, remove dirt in time, and strictly prohibit the entry of pollution sources.

5. Disease control of river shrimp raised in paddy field. The application of organophosphorus and pyrethroids is strictly prohibited. The use of pesticides should comply with the provisions of GB4285 and GB/T8321 (all parts), and the use of permethrin and phosphorus-containing drugs such as dimethamidophos and methamidophos should be eliminated. The use of fishery medicine should comply with the regulations of NY5021, use rigid microbial preparations, promote environment-friendly biological drugs, put an end to the use of prohibited drugs, regularly sprinkle block quicklime to improve the sediment, and promote the oxidation and decomposition of organic matter in the sediment.