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Book (series)Shrimp acute hepatopancreatic necrosis disease strategy manual 2020
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No results found.The contents of this Shrimp acute hepatopancreatic necrosis disease strategy manual provides information and guidance relevant to the development of policies to respond to outbreaks of acute hepatopancreatic necrosis disease (AHPND) in farmed marine shrimp. The etiologic agents for AHPND are virulent strains of bacteria belonging to the genus Vibrio parahaemolyticus and related species, which harbor specific toxin genes. While these bacterial species are part of the normal microflora of the marine environment, they may cause substantial mortalities in whiteleg shrimp (Penaeus vannamei) and giant tiger prawn (Penaeus monodon) cultured in countries in Asia and the Americas. These strains of these Vibrio bacteria secrete a PirABvp binary toxin resulting in sloughing of tubule epithelial cells and dysfunctions of the hepatopancreas in the acute form; mortality can reach 100 percent in affected ponds. Chronic presentation of this disease involves secondary bacterial infection of hepatopancreas and running mortality over the culture cycle. Acute or chronic presentation would greatly depend on the culture conditions. This disease can be considered a toxicosis rather than an infection. Economic losses due to this disease have amounted to over USD 7 billion annually. Further outbreaks of AHPND, particularly in areas that are currently free of the disease, would be expected to experience similar devastating effects on local shrimp producers and the surrounding communities; and thus, there is an urgent need to develop a contingency plan to control and eradicate this disease. This manual includes information on: 1) the nature of AHPND: a brief review of current knowledge in disease etiology, susceptible species and global distribution; 2) diagnosis of disease: a description of gross clinical signs and laboratory methods; 3) prevention and treatment: farm management, the use and development of antibiotics, bacteriophages, probiotics, disease-tolerant shrimp, shrimp immunity and vaccination; 4) epidemiology: AHPND’s geographic distribution, genotype, persistence in the environment, reservoir hosts, modes of transmission, risk factors, and economic impacts; 5) principles of control and eradication: methods for containment, mitigation and eradication of AHPND, and trade and industry considerations; and 6) policy development and implementation: AHPND-specific objectives, options and strategies for eradication and control, education, capacity building, funding, and compensation. -
Book (series)Tilapia lake virus disease strategy manual 2021
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No results found.The purpose of this manual is to inform national policymakers and other stakeholders of issues related to the development of contingency plans for responding to outbreaks of tilapia lake virus disease (TiLVD), which has caused substantial mortalities, up to 90 percent, in populations of both wild and farmed tilapia in Asia, the Americas, and Africa. The causative agent for this disease is tilapia lake virus (TiLV), which infects the liver, spleen, kidney, heart, gill tissues, brain, connective tissues of muscle, and reproductive organs of tilapia. Outbreaks of TiLVD not only have devastating economic effects on producers, but also can result in a variety of socio-economic impacts on surrounding communities. It would, therefore, be prudent to implement strategies for the prevention of TiLVD and to develop contingency plans to eradicate, contain, and mitigate the impacts of the disease when outbreaks occur. This manual provides information on: 1) the nature of TiLVD; 2) diagnosis; 3) prevention and control; 4) epidemiology; 5) principles of eradication, containment and mitigation; and 6) policy development issues. -
Book (stand-alone)Introductions and movement of Penaeus vannamei and Penaeus stylirostris in Asia and the Pacific 2004
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No results found.Both Penaeus vannamei and Penaeus stylirostris originate on the western Pacific coast of Latin America. They were introduced in the early 1970s to the Pacific Islands, where research was conducted into breeding and their potential for aquaculture. Beginning in 1996, P. vannamei was introduced into Asia on a commercial scale. The main reason behind the importation was the perceived poor performance, slow growth rate and disease susceptibility of the major indigenous cultured shrimp species, P. ch inensis in China and P. monodon elsewhere in Asia. However, there remain many unanswered questions regarding the possible effects of introduced species. This report has attempted to gather all the currently available data on the extent of P. vannamei and P. stylirostris importation and culture in Asia, their advantages and disadvantages and potential problems. It offers recommendations, for both governments and the private sector, aimed at controlling the importation, testing and culture of thes e species.
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