High salt well water freshwater shrimp

High salt well water freshwater shrimp

At present, the seawater pollution has not yet been lifted, which directly restricts the development of the shrimp farming industry. The use of high-salinity well water and seepage aquaculture methods is a new breeding mode for the shrimp industry at a low period. In Zhanhua County of Shandong Province, the use of water seepage to aquaculture China shrimp has achieved better economic benefits. Last year, the expansion of the aquaculture area, the use of high-salinity well water to freshwater cultured white shrimp, is briefly described below.
I. Breeding facilities 1. Pond conditions: Five shrimp ponds with a total area of ​​15 mu. The pond can accommodate 2.2 meters of water depth and 22,000 cubic meters of water.
2. Infiltrate the well (40 meters deep). The well water has a salinity of 46 ‰. It is used as a salt water source. The freshwater uses local ditches, Yellow River water, and rainwater and is converted into 13 to 28 ‰ of salt water according to different stages of shrimp growth. As a shrimp farming water.
3. The shrimp pond is equipped with 9 impeller aerators, 4 inlet and 4 submersible pumps, 8 centrifugal pumps, and a batch of shrimp nets.
Second, the main technical management measures 1. Shrimp pond dredging, disinfection: in early April to conduct a thorough clearing pool disinfection, the bottom of the pool most of the silt 20cm pushed to the dam, after the clear pond, into the fresh water 10cm, with lime for disinfection, mu The amount of 100kg, three days after the water drained, and then into the fresh water 40cm, for the second time disinfection, mu using quicklime 50kg, disinfection 5 days after the discharge of water.
2. Water intake: After disinfection, the shrimp ponds, when entering fresh water, need to use 60-80 mesh sieve nets to filter the eggs of harmful fish, prawn and enemy pests, and then extract according to the salinity required for seedlings. Well water mixing pool.
3. Water quality conditions: The blended shrimps were tested for salinity of 15 to 20 ‰ or more, pH of 7.8 to 8.6, water transparency of 30 to 50 cm, and ammonia nitrogen of 0.6 mg/l or less.
4. Cultivate basic bait: The pond must cultivate basic bait before laying the seedlings. Fertilizer fertilizer is applied three times during the entire cultivation of the shrimp. The total application of urea is 36kg, potassium chloride is 2000kg, diammonium is 4kg, and urea is applied 10 days before seedling release. 0.5kg, potassium chloride 67kg, the second time in the early June after release, Mushi urea 0.4kg, diammonium individual pool 4kg, the third mu urea 0.3kg (early July), so that the pool of water to remain yellow Brown or light brown.
5. Putting seedlings: The water depth is 100cm, the salinity is 25‰, the pH is 8.6, and the transparency is 45cm. Mu 30,000 seedlings were released and a total of 450,000 seedlings were released. The average body length was 0.6 cm, and the seedlings were from the Huangqin breeding farm. Samples from the Yellow Sea Fisheries Research Institute were confirmed to be virus-free.
6. Feeding: The egg yolk is fed for three days after the seedlings are released. Feeding was controlled throughout the culture process and it was appropriate to check 50% satiation after 1 hour of feeding. Strictly control the quality of food. According to the body length feeding different types of compound feed, body length 4cm before feeding feed No. 1, fed three times a day, 4 ~ 7cm daily feeding 4 times, 7cm after the feeding 5 times. During the whole growing season, a total of 2500kg of bait was fed with a feed coefficient of 0.83.
7. Add water: From the end of June to the end of June, the test tank will only add water and will not drain. If there is little rain in the area, there will be a shortage of fresh water (no reservoir), add 10 to 20cm for each subsequent rain, and inject proper amount of fresh water into the well water (salt water), start the aerator, reach full aeration, pool water, salt The purpose of mixing evenly.
8. Due to high-density farming, oxygenation is performed according to the weather. In the middle of June, the aerator is opened. Each time the machine is turned on for 1 to 3 hours; the oxygen is increased twice in the middle to late period of 7 to September, and the boot time is 5 to 9 hours. Appropriately increase or decrease the boot time according to weather changes. When the rain, wind, low pressure, shrimp peeling, when the shrimp pond water, spilled drugs, found the floating head when the aerator in time. Due to the prompt start-up, the prawns floated more than 12 times.
9. Prevention and control of shrimp disease: starting from 4cm in body length of shrimp, disinfect the pool water every 10 to 15 days. Disinfect the medicine with lime, zeolite powder, chlorine dioxide, potassium permanganate and other water disinfectants with little side effects. . Entering mid-August and late-September, the prawns grow slowly, and individual individuals suffer from polyketosis. The effect of multiple drug treatments is very obvious and controls the spread of shrimp diseases.
10. Testing: Establishing management files for shrimp ponds, special personnel to detect and record. Measure the water temperature twice a day, watch the water color, measure the PH value every 5 days, measure the salinity, transparency and PH value before and after watering, and measure the body length and survival rate of the shrimp every 10 days. Observe the feed intake and growth of the shrimp at any time and find out if problems are solved and resolved.

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