KHV or Koi Herpes Virus is a potentially deadly virus which has recently shown up in the Koi industry. As with the majority of Herpes type viruses in the world, Koi Herpes Virus is believed to remain with infected fish for their full lifespan. Even Koi that was exposed to the virus at one point or another are considered carriers, even if they did not show signs of the virus. The mortality rate for fish exposed to the virus ranges from 60 to 80 pe...