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http://dx.doi.org/10.7847/jfp.2012.25.2.111

Prevalence of viral nervous necrosis (VNN) in sevenband grouper Epinephelus septemfasciatus farms  

Kim, Choon-Sup (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University)
Kim, Wi-Sik (The Fisheries Science Institute, Chonnam National University)
Nishizawa, Toyohiko (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University)
Oh, Myung-Joo (Department of Aqualife Medicine, College of Fisheries and Ocean Science, Chonnam National University)
Publication Information
Journal of fish pathology / v.25, no.2, 2012 , pp. 111-116 More about this Journal
Abstract
Prevalence of viral nervous necrosis (VNN) in sevenband grouper Epinephelus septemfasciatus farms was investigated during the period of 2006-2008. The outbreak of the VNN was observed from August (water temperature: $24-26^{\circ}C$) to September or October ($20-25^{\circ}C$). The viral infection resulted in acute or chronic mortality of the host, where the mortality rate of juvenile fish was higher than that of the adult fish. Phylogenetic analysis based on partial RNA2 coat protein gene nucleotide sequences revealed that all the isolates from sevenband grouper were classified into the genotype redspotted grouper nervous necrosis virus (RGNNV). In conclusion, VNN of juvenile and adult sevenband groupers during the summer season (July to October, water temperature: about $24^{\circ}C$) was caused by virus belonging to the genotype RGNNV.
Keywords
Epinephelus septemfasciatus; Prevalence; Viral nervous necrosis;
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