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.
When you dissect the fish, you will see that the abdominal cavity is filled with clear or hemorrhagic ascites and that the liver is congested.
Depending on the individual, the kidneys are enlarged or grayish-white, and the spleen is abnormally enlarged.
Infected fish flounder
dynamics
In Korea, the number of cases of damage caused by VHSV infection in farmed flatfish has increased during the low water temperature period in winter and spring since 2001.
External symptoms may appear to be Edward's disease, but bacteria cannot be isolated.
The outbreak occurs in winter when the water temperature is low at 10~13℃ and mainly occurs during seedling stocking period, causing mass mortality of fry.
Target organs for infection include the heart and kidneys, as well as the spleen, brain, muscles, and gills.
Diagnosis
Diagnosis possible using cell culture or PCR ⑥ Measures
VHSV is inactivated by ultraviolet irradiation 1~3
As with other viral diseases, no chemotherapy drug has yet been developed to treat VHS.