South American white prawn
I. Pond conditions The pond is well-watered, non-polluting, and the water quality meets the pollution-free standard, that is, it complies with the provisions of GB11607. The pond covers an area of ​​3 acres to 5 acres with a water depth of 1.8 meters. The bottom of the pool is flat, there is less silt, and it is convenient for water intake and drainage. The upper layer of the pipeline enters the water, and the bottom of the pool is laid with pipes for drainage. Each pond is equipped with a 0.75kw~1.5kw microporous aerator.
Second, prepare before transplanting
1. Clear pond disinfection. Thoroughly remove silt and weeds from the pond. Before exposure, the dry ponds were exposed for 20 days to 30 days, and then 80kg to 100kg of lime were used to clean the pond with 667 square meters of water. Then 5kg to 6kg of chlorine dioxide per 667 square meters were disinfected and sterilized with water.
2. Cultivate basic bait. 2 days to 3 days before seedling emergence, when the shrimp ponds were filled with 50 cm of water, the microbial composite preparation EM was exposed to 1 kg to 1.5 kg per 667 m2 of ponds. The adjustment of the water color was dark brown or yellow-green. The transparency of the pool water was controlled at about 30 cm. .
Third, shrimp selection and stocking
1. Selection and desalination of shrimp. When selecting shrimps, strict quality control was adopted. The stocked shrimps were tested and robust and disease-free. For the first time, the cultured shrimps were kept in the greenhouse for a short period of time, ranging from 15 days to 20 days. When desalinating, the salinity of the holding pool is first adjusted according to the salinity of the nursery, and then gradually reduced, and the salinity reduced every day does not exceed 1 Torr, until the salinity of the pool water drops to 1 ‰ to 1.5 ‰. When the size of the shrimp is raised to 1.5 cm to 2.0 cm, it is put into an outdoor shrimp pond. The second cultured shrimp seedlings are first cultivated in a dense net cage or outdoor empty pond set up in an outdoor large pool, and after the first oysters are gradually captured and listed, they are stocked in batches to the first bred shrimp. In-pool farming.
2. Stocking of shrimp. The first larval rearing time began when the outdoor water temperature stabilized at 20°C or more and started to sprout. The stocking time ranges from May to mid-June in each year, with an average of 28,000 to 30 thousand tails per 667 square meters. The second seedlings will be gradually reared after the first shrimps are caught at the beginning of July, and the amount of seedlings will be released between 25,000 and 28,000 tails per 667 square meters. The total stocking of the second-rate shrimp seedlings was controlled within 60,000 tails per 667 square meters.
Fourth, feeding and management
1. Water quality management. The quality of water directly affects the growth and survival rate of shrimp. In the early stage of cultivation, the water is mainly added; in the middle and later stages, more water and water are replaced, and the water in the pool is kept flowing throughout the day. At the same time, the aerator was opened in time according to changes in climate and water quality. When the pool water is rich and the water color is rich, the organic pollutants are adsorbed by the zeolite powder and the hydrated lime in time. Every 15 days to 20 days, an EM original or living water treasure is used to improve the bottom quality and purify water quality. The pH is maintained at 7.5-8.5 and the dissolved oxygen is above 5 mg/l.
2. Feed feeding. The feed was selected exclusively for P. vannamei. First of all, ensure that the feed is fresh and not bad, and the particle size is suitable. According to the growth of shrimp, choose different specifications of feed. The second is to control and adjust the amount of feeding. Daily feeding is mainly based on shrimp feeding conditions and water quality, temperature, so that a small number of times to check the bait station without leaving the residual bait principle.
3. Daily management. Adhere to the daily morning, midnight and evening patrol inspections. Check whether the various facilities are in good condition, observe changes in water quality in the shrimp ponds and shrimp feeding activities, check whether diseased shrimp and lack of oxygen floating head phenomenon, etc., find problems and take emergency measures in a timely manner.
Fifth, disease prevention adheres to the principle of “prevention and health managementâ€. Every 15 days to 20 days, alternately disinfect once with safe drugs such as quicklime and dibromohydantoin. Regularly add 1‰~2‰ of vitamin C, viroid, etc. in feed to enhance shrimp immunity and anti-stress ability. When water is changed, water is mainly added, so that it is not possible to discharge large water and keep the water quality relatively stable. Every 25 days to 30 days to do a virus test, found that the disease immediately identified the cause of the shrimp, and then the right medicine.
Sixth, harvesting and harvesting methods are mainly used for trapping nets, pulling nets, and finally dry ponds for catching. When Penaeus vannamei was cultured for 70 days to 80 days, the specifications ranged from 60 to 90 tails per kilogram, which were captured in small batches and listed in batches. They began dry pond fishing in mid-to late October.
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