I. Pond Conditions Shrimp ponds should be equipped with a reliable water source, ensuring that the water quality meets the standards set by GB11607, which includes no pollution and suitable chemical properties. The pond bottom should be flat and free of excessive silt to allow for efficient drainage. The ideal pond size ranges from 3 to 10 acres, with the optimal area being between 3 to 5 acres. Water depth should be maintained at 1.8 to 2.5 meters, and each pond must have 2 to 3 aerators to ensure proper oxygenation and maintain healthy conditions for shrimp growth.
II. Preparations Before Stocking 1. Pond Cleaning and Disinfection: For new ponds, it is recommended to soak the pond with water before applying disinfectants. Old or previously used fish ponds that are being converted into shrimp ponds should be dried for 20 to 25 days, after which sludge and weeds are removed. After cleaning, apply quicklime at a rate of 80-100 kg per mu to thoroughly disinfect the pond and create a safe environment for shrimp.
2. Cultivating Natural Bait: Five to seven days before the shrimp seedlings arrive, apply 1-1.5 kg of microbial composite preparation (EM) per mu to promote beneficial microorganisms in the water. Two days prior to planting, add a small amount of urea and superphosphate to the pond to encourage plankton growth. This helps achieve a water clarity of 25-30 cm and a dark brown or yellow-green water color, which is ideal for shrimp development.
3. Adjusting Water Salinity: For freshwater ponds, 1 to 2 days before stocking, add 150-200 kg of coarse salt or sea crystal per acre to raise the salinity to 1‰ - 1.5‰, which helps reduce stress on the shrimp during the initial stages of cultivation.
III. Shrimp Selection and Stocking 1. Selecting and Desalinating Shrimp: Choose healthy, disease-free Penaeus vannamei seedlings that are over 1.0 cm in size. Before introducing them into the pond, they should be quarantined to prevent the spread of diseases. For early-season stocking, when temperatures are low, shrimp are kept in a nylon greenhouse or similar structure for 10-15 days, gradually reducing salinity by no more than 1‰ per day until reaching 1‰ - 1.5‰. Once the shrimp reach 1.0-1.5 cm, they can be transferred to outdoor ponds. For second-cycle shrimp, they are first placed in a temporary holding pool surrounded by nylon cloth or in a net cage for 7-8 days of desalination before being moved into the main pond.
2. Stocking Density: First-cycle seedlings are typically stocked in mid to early May when the water temperature stabilizes above 20°C. The recommended stocking density is 3.8-4.0 million per mu. For the second cycle, the density should be slightly lower, around 2.8-3.0 million per mu, to avoid overcrowding and ensure better growth and harvesting results.
IV. Feeding and Management 1. Water Quality Control: Water quality plays a crucial role in shrimp growth and survival. During the early stage, water is mainly added, while in later stages, regular water changes are necessary—every 5-7 days, but not exceeding 30% of the total volume. Aerator use should be adjusted based on weather and water conditions. Every 15-20 days, apply photosynthetic bacteria or EM to improve sediment quality and maintain clean water.
2. Feeding Practices: Use high-quality, full-nutrient pellets as feed. Ensure the feed is of good quality and appropriately sized for the shrimp. The daily feeding amount should be controlled at 30%-5% of the shrimp's body weight. However, in actual practice, feeding should be adjusted based on the shrimp’s behavior, water quality, and temperature, often done in smaller portions multiple times a day for better absorption and digestion.
V. Disease Prevention Adhere to the principle of "prevention first, health management." Every 15-20 days, alternate between using environmentally friendly disinfectants such as quicklime, dibromohydantoin, photosynthetic bacteria, and EM to keep the pond environment safe. If artificial feed is used, regularly add 1‰-2‰ vitamin C and immune polysaccharides to boost shrimp immunity. When changing water, avoid large-scale irrigation to maintain stable water conditions.
VI. Harvesting South American White Shrimp The primary method for harvesting market-ready shrimp is through trap nets placed in the pond, followed by final collection in dry ponds. Harvest timing depends on market demand, price fluctuations, and shrimp growth. After 70-80 days of cultivation, shrimp can reach 60-90 tails per kilogram and are ready for harvesting in batches. The first harvest is usually scheduled in late July or early August to avoid delaying the stocking and growth of the second crop. This ensures a continuous and efficient production cycle.
X Ray Lead Suspender Skirt,0.35 Xray Lead Skirt,0.5 X-Ray Lead Suspender Apron,Radiation Proof Lead Skirt
Longkou Kangxie Medical Instrument Co., Ltd , https://www.kangxiemedical.com