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首页> 外文期刊>Aquaculture International >Emergence of viral nervous necrosis is associated with mass mortality in hatchery-reared tilapia (Oreochromis niloticus) in Egypt
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Emergence of viral nervous necrosis is associated with mass mortality in hatchery-reared tilapia (Oreochromis niloticus) in Egypt

机译：病毒神经坏死的出现与艾滋病饲养的罗非鱼（Oreochromis Niloticus）的大规模死亡率有关

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摘要

Mass mortalities in Egyptian hatchery-reared Nile tilapia (Oreochromis niloticus) fries have negatively impacted the livelihood of fish farmers for the past 3 years due to fish loss (up to 70%), feed waste, and loss of job opportunities. An investigation into possible viral causes of massive die-offs in tilapia during 2018-2019 identified nervous necrosis virus (NNV) strains phylogenetically related to red-spotted grouper NNV. Clinical signs and gross pathology of naturally infected fish were consistent with classical NNV infections. Electron micrographs revealed virions in the retina and brain. NNV RNA was also detected in the brood stocks' brains and ovaries. Experimental infection of NNV-free fries resulted in 100% morbidity and mortality. Since this is the first report of VNN-outbreaks in African tilapia, different aspects of viral epidemiology and possible ways to break the epidemic wave and prevent future interspecies transmission events are discussed.
机译：埃及孵化场养育尼罗基亚（Oreochromis Niloticus）炸薯条的大规模死亡对过去3年来对鱼类损失（高达70％），饲料浪费和工作机会丧失的生命产生了负面影响。 2018 - 2019年罗非鱼巨型抑制可能发生病毒原因的调查鉴定了与红色斑点Grouper NNV有关的神经坏死病毒（NNV）菌株。 天然感染的鱼的临床症状和毛病理学与古典NNV感染一致。 电子显微照片在视网膜和大脑中显示了病毒藻。 在育雏股的大脑和卵巢中也检测到NNV RNA。 NNV的实验感染无NNV的炸薯条导致了100％的发病率和死亡率。 由于这是非洲罗非鱼VNN爆发的第一份报告，讨论了病毒流行病学的不同方面以及打破疫情的可能方法，并防止未来的交际传输事件。

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