In exports, high disease and increased risk of Penaeus vannamei culture
Penaeus vannamei is the salt water can intensive culture of freshwater prawn species good. Last year, a good harvest of Penaeus vannamei farming, farmers further stimulated the enthusiasm of Penaeus vannamei farming, many farmers look like to follow suit, intends to fish ponds, adjusted to engage in crab pond culture of Penaeus vannamei, and new excavation shrimp . Particularly in the areas of fresh water Qiantang River momentum to push hard this year, Xiaoshan District, may be added only breeding area of 8000 mu, the total area of 4 million acres.
However, there are many shrimp Penaeus risk, farmers need to raise alert:
First, market risks. By July 6, 2004 the United States began the implementation of the six countries including China shrimp anti-dumping sanctions, together with the European Union and Japan continue to raise the threshold of food safety standards and increase test items, change detection, so that greatly reduced our total shrimp exports. China's shrimp exports in 2004 total 15.41 tons, down 18.3%; in January 2005 to October 2004, another year to reduce 21,600 tons, decreased by 23.1%, the volume of exports 85 million U.S. dollars, up 23.6% decline, there's total export both more than double-digit volume and export value significantly decreases.
Our province, the 2005 as Guangdong and Hainan provinces seedlings of large-scale stocking of early disease and death, coupled with the tsunami in Thailand, Indonesia and other Southeast Asian countries, the impact of shrimp to make shrimp price increase over the previous year, but the provincial Many processing enterprises within the current frozen shrimp and cooked frozen shrimp are about 50% of the backlog, it will affect the smooth delivery of this year's shrimp prices.
Second, breeding and high risk. Since 2005, climate, despite being "Matsa" and typhoon, but the duration is not long, the lower the incidence of shrimp diseases, growth generally good, individual size and yield is also higher. According to the Meteorological Department forecast this year, variable weather, typhoons, so white shrimp disease control will be very difficult, because many of the area after several years of cultivation, the bacteria cross-infection and internal sources of pollution are likely to further exacerbate, breeding and Risk is also growing. In 2004, on rainy days because of long duration, water quality control difficult, resulting in a large area of incidence and mortality, the province only 20% to 30% of farmers profitable.
Penaeus vannamei culture in view of the risks, all departments and the majority of farmers must pay close attention. One is to control the scale of breeding, do not blindly follow the trend of development. In particular, the pure water needs salt farming areas, farming is not only costly, greater the risk of disease, may also lead to salinization of the land should be strictly limited; on less water, pollution is a serious breeding areas to guide the development of other aquaculture species. Second, deepening the process, open up sales channels. To increase the processing enterprises to support marketing efforts, expand the processing scale and develop more intensive processing product variety, improve product value and expand domestic and foreign markets to expand sales channels to meet the market demand. Third, the establishment of aquaculture production to avoid the main health and safety concept of ecological farming. In addition to dredging thoroughly disinfected with lime clear pond, we must also pay attention to choose not to bring a particular pathogen, there is no antibiotic residues was greater in feeding biological health of shrimp feed, and appropriate reduction of stocking density. Frequently used in the production process to the end of Microorganisms and quality conditioner to improve water quality and sediment, in a timely manner and the use of water tankers aerator impeller aerator for solid oxygen to ensure adequate dissolved oxygen, feeding and attention to quality control of feed feeding to reduce the amount of waste to prevent pollution during the typhoon season in time to take emergency measures to reduce the stress response prawn and implement a balanced wheel caught the listing contains shrimp ponds to reduce the typhoon season, improving overall efficiency culture.
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