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Shrimp pond polyculture technology
I. Selection and sizing of shrimp ponds 1. Water quality Water source: mainly natural tides, no water pollution, seawater specific gravity between 1.008 and 1.022, optimal 1.010 to 1.015, water temperature 3 to 32°C, and optimal 15 to 25°C , pH 7.5 to 8.4. 2. Shrimp pond bottom quality: soft mud or silt mixed quality is better, pure sandy and hard mud bottom quality should not be. The new shrimp pond with a ring ditch type is the best. The old shrimp pond must be thoroughly dredged before it can be cultured. 3. Depth of area: shrimp pond area is generally about 30 to 50 acres, easy to manage, effective depth of 1.5 ~ 2.0m, water level of 0.8 ~ 1.2m, minimum 40 ~ 60cm. 4. The whole building is built. Wow: Generally choose Zhongtan and part of the beach, 20 days ahead of the earth, plowing, building into a width of 3 ~ 3.5m, length 15 ~ 20m, the spacing between 30 ~ 40cm, deep groove 25 ~ 30cm, easy drainage and operation management. About 15 days before planting, Nahai seawater is soaked for 20 to 30 cm for 3 to 5 days, and the mud is turned 20 to 30 cm and leveled. It is advisable to use 10% to 15% of the area of ​​shrimp ponds for breeding. 5. Qingchi Disinfection: Each year about 15 days before the end of fall and winter or about 15 days before the emergence of the seedlings, 20 ppm of tea cake or 350 ppm of quicklime or 60 ppm of bleaching powder should be disinfected, and disinfected water should be discharged after 3 to 5 days. 6. Fertilizing bait: about one week before sowing, 60 to 80 mesh sieve net filter into the new water 20 ~ 30cm, mushi chicken manure 50kg or urine 10kg or nitrogen fertilizer 5kg, phosphate 0.5kg, breeding pond basic food organisms. Second, seedlings sowing 1. Sowing time: generally in mid-March to early April, before the tidal flooding seedlings, in order to sow in time after the water into the pool. 2. The density of seeding: According to the surface of shrimp pond, the average length of seeding body is 2～2.5cm, the size is 3000～5000/kg, and the shell is not broken, robust and uniform in size. Seedlings 5～7.5kg, equivalent to seeding Seedling 250 to 400 grains/m2. Shrimp seedlings are sown in the seedlings for about one month, and they usually enter the pool for about one month, and usually have about 50,000 tails or about 10,000 heads of seedlings in an enlarged shed. 3. Seeding method: The seedlings are transported to cool for about half an hour and vibrate the seedling basket several times, so that the water pipes can be contracted and the drilling potential can be increased. When sowing seedlings, sorghum surface exposed or impounding 2 ~ 3cm, the seedlings evenly spread on the surface. Avoid heavy winds and rainy days sowing seedlings. A large number of unoccupied dead seedlings were found to be timely replanted in order to prevent the shrimp from killing the seedlings. Third, production management 1. Timely transfer of water: After playing seedlings, the surface water depth can be 20 ~ 30cm, shrimp seedlings into the pool every week, add water 20 ~ 25cm, depending on the color conditions, timely and appropriate amount of water, fertilizer and water to maintain water quality Fresh, fresh and tender, the fresh water will be drained immediately after heavy rain. Apply fertilizer in general mu 2 ~ 4kg or nitrogen fertilizer 2.5 ~ 5kg, phosphorus 0.25 ~ 0.5kg, less Shi Qin Shi, sunny noon Shi. After the prawns were harvested, they continued to use fertilizer. 2. Regular dew exposure: During the flood season, the surface of the noodles will be dehydrated by drainage for 1 to 3 hours, and fresh seawater will be included immediately after the tide. Usually every 10 days or so, preferably in the morning and evening, if dried at noon, to prevent stagnant water burns seedlings. 3. Removal of algae: It is easy to breed various kinds of algae in winter and spring and remove it in time. 4. Shrimp Pond Feeding: Shrimp is mainly based on bait to ensure that the shrimp are full; do not put the bait on the surface of the cultured quail. 4. After the harvesting season is harvested for 4 to 6 months, after the shrimps are harvested in the early August or so, the average body length of the puffers reaches 5 to 6 cm or more and 60 to 90 birds/kg. Individuals are plump and can be drained for sale. Those who couldn’t catch it could continue aquaculture and strengthen the management of wintering, insisting on emptying before the end of October, and then selling it again from January to February of the following year. V. Benefit Analysis Generally, the yield per mu of shrimp ponds can be 100 to 200 kg, the specifications are 60 to 90 per kg, the per mu shrimp is 20 to 50 kg, the per mu output is 2100 to 4300 yuan, and the profit is 1300 to 2100 yuan. VI. Problems and Suggestions: 1. In the period of high temperature and cold air, the water depth should be kept above 1.5m to maintain the constant water temperature; 2. The area of ​​sowing should not exceed 25% of the area of ​​the shrimp pond, otherwise it will affect the growth of the earthworms. Will cause Pan Tang; 3. During disease prevention and disease prevention and general Shichazi cake leaching solution 7 ~ 8ppm, select large tides and large water changes; found cricket death, can be applied to the Mushi bacterial net 200mL plus fresh water 15kg evenly sprayed Tu treatment, the prevention of the use of halved; 4. Culture pond 1 to 2 years of rotation of shellfish cultured species, or shrimp pond another Jian.
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