Viral Nervous Necrosis in Striped Jack, Pseudocaranx dentex.

概要

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Episode of the disease outbreak, disease signs and histopathology, epizootiology, properties of the causative virus, diagnostic methods, and prophylactic measures of viral nervous necrosis (VNN) in striped jack, Pseudocayanx dentex, were outlined in this review. The first occurrence of VNN in striped jack was recorded in 1989. The causative virus is a non-enveloped, icosahedral virus 25 nm in diameter, containing 2-segmented, non-polyadenylated, positive sense single-stranded RNA. Based on these characteristics, it was determined as a new member of the family Nodaviridae. The same disease has been observed in over 20 marine fish species cultured in Asian and European countries. VNN usually occurs in larval and juvenile fish in hatcheries, however, young or adult groupers, Epinephelus spp. and seabass, Dicentrarchus labrax, are also affected in grow-out farms. Recently the disease in striped jack has been successfully controlled at hatcheries of the Japan Sea-Farming Association where the following prophylactic measures are practised: Health management of spawner candidates, selection of virus-free spawners based on the detection of the virus from gonad by PCR, and disinfection of fertilized eggs with ozone.
日本水産増殖学会の論文