Qianjiang can use well water to raise shrimps. 1. Main breeding facilities
1. 28 indoor breeding pools with a total area of ??4 acres; 3 outdoor pools with an area of 1.5 acres, 1.5 acres and 8 acres. Total 15 acres.
2. Drill two deep water wells with a depth of 90 meters, a salinity of about 16‰, and a daily water output of 400 cubic meters. Using groundwater as a breeding water source can prevent bacterial contamination. Indoor breeding pools are equipped with relevant Temperature and light adjustment equipment, the groundwater is treated and then enters the breeding pool for high-density culture of white shrimp.
3. Repair and disinfection of breeding ponds. In May, personnel were organized to desilt and repair each cement breeding pond, remove sludge and debris at the bottom of the pond, disinfect it with 50 ppm bleaching powder, and then fully flush it with non-polluted groundwater, fundamentally eliminating the spread of the disease. , ensuring the smooth progress of breeding production.
2. Water Intake
Put the underground well water into the outdoor oxidation tank, oxidize it for a week, and then put it into the disinfected nursery room to cultivate basic feed organisms. Each cubic meter Apply 5 grams of urea and 2 grams of superphosphate to the water body. From now on, apply 50% of the pre-applying amount every day to make the transparency reach about 30 cm, ready for planting seedlings.
3. Seed stocking
1. Shrimp seedling selection In shrimp farming, seedlings are very important, and the quality of the seedlings directly affects the success or failure of production. We purchased 6 million healthy white Penaeus vannamei nauplii from the nursery in Jinjiang, Fujian, and carried out seed cultivation. By mid-June, 1.5 million commercial seedlings were finally produced. The seedlings are neat in size and 1.5 cm in length. Left and right, lively and strong, with strong swimming ability, transparent body color, and dark brown liver and heart area.
2. Time to release seedlings: The time to release seedlings is June, and the water temperature in the pond is 21°C.
3. Seedling density: 1.5 million seedlings were put into 31 cement pools, with an average of 100,000 seedlings per mu and 150 seedlings per square meter.
IV. Management during the breeding period
1. Feeding In the breeding production, no fresh bait is used, only mixed bait is used, and the feeding amount is determined according to the body length of the shrimp. Feed to the lowest standards.
2. Change the water. The method of water change is to add water with leakage and siphon drainage. In spring and autumn, the groundwater is oxidized and then put into the pool. In summer, the groundwater is used directly and the water level is kept at about 1.5 meters. Water environment indicators are controlled at: dissolved oxygen greater than 5 mg/L, total ammonia nitrogen less than 0.6 mg/L, pH value 7.8-8.6, and daily fluctuations in salinity less than 5‰.
3. Oxygenation: Two oxygenators are installed in each breeding pond to oxygenate the water according to the water quality. In the early days, the machine is turned on for two hours at noon, and for 2 to 3 hours at dawn, and the startup time is gradually increased. In the middle and late stages of breeding, in addition to shutting down for feeding, the machine is usually turned on continuously day and night to ensure that the breeding water is rich in dissolved oxygen.
4. Disease prevention and control: Strictly disinfect the breeding ponds, apply dibromohydantoin and PV iodine every half month during high temperatures, and regularly add high-efficiency aquatic nutrient solutions to prevent large-scale diseases from occurring during the breeding period.