Outbreaks of viral nervous necrosis in juvenile and adult farmed Atlantic cod, Gadus morhua L ., in Norway.

The article focuses on a study conducted to investigate the outbreak of viral nervous necrosis (VNN) in the farmed Atlantic cod fishes in Norway during 2006. It discusses the genetic factors causing VNN in farmed juvenile and adult marine fish species, and gives an overview of the investigations done by the study on the infected fishes. Also discussed are the disease symptoms found in fishes during the study, and explores its findings on the pathogenesis and etiology of VNN.