Chapter 1 Major marine fish diseases and countermeasures 1. Halibut viral disease Viral hemorrhagic sepsis Pathogen Viral hemorrhagic septicemia virus It has been isolated from freshwater salmonid fish as well as various marine fish in Europe and North America. Symptom Darkening of body color, abdominal distension due to ascites retention, hernia, fading of gills, etc. are observed. ..
