1 Dredging and disinfection
After harvesting (season or oyster) shrimp, it is necessary to brush the pool wall and drain the pool water. Dredging drying ponds. The sludge and debris in the shrimp pond must be completely removed. For the muddy black mud, remove it as much as possible and transport it to a place away from the shrimp pond so as not to cause hidden troubles in the construction. After dredging, the shrimp pond must be flushed until there is no black sewage. After the dirty water is drained, the sun pond will be drained, and before the seedlings are introduced, appropriate amount of clean seawater or fresh water will be introduced, and some drugs with strong bactericidal clearing force, such as Texiaoling, dibromohydantoin, and bromochloroheine, will be selected to perform better. Pond disinfection. The liquid must be spattered evenly in the pool water. In the place where the liquid is not soaked (including the wall dyke), use a tool to spill the liquid and soak the tank for several days. During soaking, if any dirt is floating on the surface, it should be removed before 5 o'clock in the afternoon. After a few days, drain the liquid and check the pond. If any biological debris remains in the pool, it must be removed and the water allowed to enter. When entering the water, add 80-100 mesh filter mesh or mesh bag to the inlet.
2 Water disinfection and water quality testing
When the pool is filled with water to the required water level (the water level should be determined according to different seasons), first check whether the water body is bringing in rotifers and dinoflagellates (nocturnal algae), noctiluca and detecting salinity, pH value, if there is rotifer, A Algae, etc., should use drugs that can kill rotifers, dinoflagellates, and water bodies. If seawater does not carry rotifers or dinoflagellates, some disinfectants that can kill harmful bacteria and have no lethal or injurious effect on algae, such as dibromohydantoin, bromochlorohydantoin, etc., should be used. disinfection. After the water is disinfected, pH and salinity tests are performed. If the pH value is less than 8.0, a certain amount of lime powder must be poured to increase the pH. If it is muddy sediment, it is better to inject dolomite powder or zeolite powder with 50 to 80 kg per mu and cover the sludge for improvement.
3 fertilizer water
Algae fertilizer and water is an important link, must not be underestimated, whether the amount of plankton plankton to meet the requirements. This has a direct relationship with the early survival rate of the seedlings. Therefore, if the survival rate of shrimp is high and the yield is high, it is necessary to carry out fertilizer and water. The transparency of the early fertilizer should be 30-40 cm. Penaeus lobosa (green prawn and prawn) are brown (brown), and brown water is mainly Chaetoceros sp., and zooplankton can be fed to shrimp larvae for feeding. Penaeus vannamei is yellow-green or green and requires fresh water. Here are some methods of fertilizers for reference (in water depth of 1 meter):
(1) Living Water (Microbial Fertilizer): 1 kilogram per mu, splashing water.
(2) Hyaluronic acid (Bacillus subtilis): 350-400 grams per mu, splashed with water.
(3) Tea bran: earth pond 3-4 kilograms per mu, sand pond 6-7 kilograms, slope pool 8-10 kilograms. Soak 4-7 days, filter to slag, even after pouring water. Sodium Dihydrogen Phosphate or Potassium Dihydrogen Phosphate: 10 grams per cubic meter of water, evenly spilled after watering. Compound fertilizer: 2-3 kilograms per acre, 1 kilogram per acre after every 1-2 days, evenly spilled after watering.
4 seed selection
The choice of shrimp is also one of the keys to the success of shrimp farming. Therefore, it is imperative to carefully select healthy specimens that are tested, free from viruses, and harmful bacteria. The following provides an intuitive selection method for reference:
Penaeus lobata (green prawns, lobster) seedlings: 1.1 cm above must be used, the individual size is uniform, the body surface is clean, the body color is normal, there are no attachments, swimming activity, can swim against the water, shrimp body in a straight line, swim When open, both eyes open, and the two eyes and the tail leaves will open for a while when they are not swimming.
Penaeus vannamei (white shrimp) seedlings: body length 0.9-1.0cm, body color transparency. Individual differences are not significant. The stomach has good plumpness, strong appetite, active swimming, strong anti-water swimming power, clean surface, uniform color, good fitness, and big head and small body.
5 Seed Transportation and Disinfection before Lower Pond
During the transportation of seedlings, especially the farms that are far away from the seedlings farm, there will inevitably be losses during transport and reduce the vigor of the shrimp seedlings. In order to ensure the survival rate and vitality of seedlings and reduce the mortality rate, 100 g of immunopolysaccharide or 30 to 50 g of G-D is added to the water (0.3 m3) of water for prepacking the seedlings. Lifeline (only one of them is used), stir well, swell, and use the water in the bucket to hold the bag. Return to the farm, with a good disinfectant [Qianke 101 {super iodine quaternary ammonium salt), half a mu of 0.5-1 grams of water, soak for half an hour] seed disinfection and then cast seedlings into the pool.
6 Set up feed observation stand and aerator
Each shrimp pond is best equipped with a feed observatory in both East and West. The setting of the feed station facilitates the observation of shrimp feeding and the amount of feed. Through the observation of the feed table, we can understand and understand the stomach fullness of the shrimps, the amount of feedstuffs, the shrimp manure and the distribution of the shrimps, so as to decide whether to increase or reduce the amount of feed delivered to a certain part.
The matching of aerators is generally matched to 1 horse per acre. If the density of seedlings is more than 60,000, one acre or more aerators per acre is required. The matching of aerators is preferably based on three types of impellers, submersibles, and nanotubes, and the effect is better. The addition of an aerator will not only avoid anoxic floating heads, but also improve the water environment and activate the water condition factor.
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