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http://dx.doi.org/10.5657/KFAS.2015.0403

Prevention Strategies for Viral Nervous Necrosis (VNN) in Sevenband Grouper Epinephelus septemfasciatus Aquaculture Farms  

Kim, Wi-Sik (Department of Aqualife Medicine, Chonnam National University)
Kim, Jong-Oh (Department of Aqualife Medicine, Chonnam National University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.48, no.4, 2015 , pp. 403-410 More about this Journal
Abstract
Viral nervous necrosis (VNN) is a serious disease of sevenband grouper Epinephelus septemfasciatus in Korean aquaculture farms. However, we suggest the following preventative methods for hatcheries: 1) disinfecting rearing water, 2) selecting spawners via ELISA and PCR, 3) selecting eggs via PCR, 4) disinfecting fertilized eggs, and 5) proper facilities management. When these methods are implemented, nervous necrosis virus (NNV)-free fish are produced because vertical and horizontal transmission is prevented. However, horizontal transmission of NNV through rearing seawater sourced from the environment during grow-out stages in sea cages can still occur. Live NNV vaccines with a low rearing temperature or Poly(I:C) immunization are very effective at preventing horizontal transmission of NNV in rearing farms. Furthermore, even after VNN is contracted, fish mortality can be reduced by administering Poly(I:C).
Keywords
Nervous necrosis virus (NNV); Prevention; Sevenband grouper; Viral nervous necrosis (VNN);
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