WHAT IS KHV?
KHV is a highly infectious disease that hits hardest in water temperatures between 16°C and 28°C. Outside of this range it may stop affecting a fishery. It is spread from fish to fish, but other agencies can be responsible for its transfer, including fish urine, faeces and infected water. On some fisheries KHV can wipe out just a handful of fish while on others the whole stock of carp can die from it.
The first confirmed outbreaks were in Israel in 1998, since when it has spread rapidly to at least four continents. It was first reported in the UK in ornamental fish in 2000, but the first main outbreak in recreational fisheries was in 2006. Since then there have been between six and 25 confirmed outbreaks each year. There is no known cure.
Any fishery who suspects they have KHV must inform CEFAS, who will then investigate and confirm whether or not this is the case by running a series of tests.