China's large-scale artificial breeding of shrimp began in the early 1980s, and the South China Sea did not begin large-scale cultivation of shrimp until 1985. The outbreak of nationwide shrimp disease in 1993 has so far prevented the virus disease from being effectively controlled, which has caused many shrimp farmers to lose money in successive years, affecting the healthy development of the shrimp farming industry. In particular, when shrimp farmers abuse drugs after an outbreak of shrimp disease, they not only increase the cost of raising shrimp, but also pollute shrimp ponds and the surrounding sea areas and the environment. Drugs also remain in shrimp bodies, which reduces the quality of shrimp and affects the export and foreign exchange of cultivated shrimp products. China's accession to the WTO soon, to study and solve this problem in shrimp aquaculture, appears to be more important and very urgent. In order to solve the above problems, the company explored a new model of high-quality, high-productivity and high-efficiency cultured shrimp, and promoted the healthy and sustainable development of the aquaculture industry. With the help of the relevant departments and experts, they learned from other aquaculture experience. The author is in Bailing Village, Dongli Town, Leizhou City. The South Zhazi Aquarium has carried out research on the prawn culture of circulatory water ecological intensive culture and achieved good results. This model is introduced to everyone for reference.
I. Aquaculture facilities and species Recycling water ecological intensive culture of shrimp research, the test pool is round, with an area of â€‹â€‹1.71 acres, a depth of 3 meters, an average water depth of 2.4 meters, the largest aquaculture water 2717 cubic meters, the general aquaculture water 2400 cubic meters. In addition to the test pool, there are also deepwater aerators, sewage tanks, sedimentation tanks, aquatic biotrenches, filtration tanks, and bacteria pools. On April 13, 2001, 212,000 South American white prawn seedlings were stocked, and the shrimps were 0.9-1.3 cm in length. Second, the model features and mechanism of action
1. A shrimp-water-saving and water-saving environment Recycled water ecological intensive prawn, in essence, a shrimp-pool water, after continuous circulation, in addition to natural evaporation and absorption of bottom water and some water loss and supplemented with well water, a shrimp farming During the process, seawater will not be supplemented. The water flow of circulating water is: shrimp pond â†’ sewage pond â†’ sedimentation pond â†’ aquatic biotrench â†’ filter pond â†’ bacterial pool â†’ shrimp pond. Therefore, it is not only a water-saving project, an ecological project, but also an environmental protection project that does not pollute the environment. At the same time, the pathogens of the external environment will not enter the farming system. In this model, shrimp disease is difficult to occur due to better internal protection and external defense.
2, the use of beneficial bacteria instead of drugs to prevent this model of shrimp farming, the entire process is absolutely not remedy. At the bottom of the bacterial pool there is a bacterial breeding trough, based on the number of shrimp, growth conditions, specifications, water quality, weather, pH, transparency, water temperature, specific gravity, etc., to comprehensively consider the amount of beneficial bacteria to be put in and the number of servings. The clean water filtered by the filter tank flows into the bacteria pool due to the pressure difference, and the bacteria propagated in the bacteria tank are continuously carried into the shrimp pond. Bacteria pool breeding a large number of beneficial bacteria can control the onset of harmful bacteria and shrimp disease virus, while beneficial bacteria also use shrimp excrement and shrimp body excreted mucus, to carry out life activities, harm is beneficial, and produce dissolved oxygen, which have A variety of beneficial bacteria is also a good food for juvenile shrimp. This mode of shrimp farming, shrimp is not only difficult to disease, and shrimp grow fast, smooth body color, full shrimp, shrimp meat absolutely does not contain residues of shrimp, is a 100% ecological shrimp.
3, planting aquatic organisms to absorb harmful ingredients shrimp pool water through the deep-water aeration machine centrifugal effect, the residual bait and fecal material discharged to the sewage pool, and then into the sedimentation tank, after a certain period of time after the precipitation, into the aquatic biotrench, The various inorganic salts (including nitrite) contained in shrimp pond water are greatly absorbed by aquatic organisms (seaweed, etc.), resulting in the growth of aquatic organisms, reducing the concentration of harmful components in the water, and ensuring the healthy growth of pond shrimp. Third, the harvest and promotion of application prospects After 98 days of breeding, the test ended on July 21. When the results were identified, the results of random sampling tests showed that the growth of white shrimp was relatively tidy, and the body color of the shrimp was greyish white. No abnormal body color was found, and the full body was good. The shrimp body was robust, and no disease or dead shrimp was found. The average length of the shrimp was determined to be 11.87 cm, with an average weight of 18.52 grams per tail, equivalent to 54 fish per kg. A total of 2719.1 kilograms of Penaeus vannamei was harvested, equivalent to 1590.1 kilograms per kilogram of shrimp, which was more than double the yield of the intensive shrimp culture in the high-level pool. The cost of shrimp ponds in this model is 30,000 yuan per mu (including supporting facilities). The cost of beneficial bacteria used in breeding is 1,500 yuan per mu, and the yield per mu is more than 1,500 kg. Although the shrimp price is low this year, the per mu output value still exceeds 48,000 yuan. After deducting the cost, the profit per mu can reach more than 15,000 yuan, and the benefit is better. It can be cultivated for 2-3 years in a year. If it is properly equipped with facilities such as warming, it can be cultivated 3 times a year. Therefore, the profit will be more than 45,000 yuan per mu per year. The economic benefit is 2 times higher than that of the general high pool.
This model has achieved a win-win result for shrimp production and shrimp quality, and is bound to create a new situation for shrimp farming.
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