Press release

Outbreaks of Koi herpesvirus (KHV) disease in 2018

The Fish Health Inspectorate (FHI) have found Koi herpesvirus (KHV) disease in fish at the following sites in England and Wales


The Fish Health Inspectorate (FHI) have found Koi herpesvirus (KHV) disease in fish at the following sites in England and Wales.

KHV is a serious viral disease of fish and is a listed disease in the United Kingdom. It affects all varieties of common and ornamental carp species (Cyprinus carpio) and can result in large scale mortalities. Fish with KHV disease may show the following signs, especially when water temperatures are between 16 to 28 °C:

  • necrotic (white or brown) patches on the gills
  • rough patches on the skin and sloughing mucous
  • sunken eyes

You must contact the FHI if you suspect an outbreak of KHV. This includes fish with the above signs, or deaths of carp or carp hybrids.

There is no risk to public health.

New outbreaks

When laboratory testing confirms KHV disease at a site, the FHI place statutory controls to limit the spread of the disease. These controls restrict movement of aquatic animals and ensure equipment is disinfected.

Disease controls have been applied at:

Controls lifted

Sites with KHV disease must undergo a formal monitoring programme for the duration of the calendar year immediately following the outbreak. The FHI visit these sites to look for evidence of disease and to inspect compliance with the conditions of the statutory controls in place. The controls are removed if the disease doesn’t reoccur during this period.

Some sites choose to cull and disinfect their stocks, rather than undergo monitoring.

Diseases controls lifted at:

  • Swallow Aquatics, Rayleigh - 20 July
  • J & K Aquatics Ltd Wholesale unit – Black Vat system and the Retail Unit, Somerset - 13 August
  • Blagdon Water Gardens - Systems containing susceptible species, Somerset - 13 August
  • Watermarque Yeovil - Systems containing susceptible species, Somerset - 13 August

Further information

You can:


Koi herpesvirus disease (KHV) is a listed disease under The Aquatic Animal Health (England and Wales) Regulations 2009. KHV outbreaks have been subject to statutory controls in the UK since 2007. The UK maintains a surveillance programme for this disease.

When the FHI confirm an outbreak, they take steps to control and, wherever possible, remove the disease. This may involve movement controls on susceptible species in the affected area, enhanced biosecurity, culling of fish, and cleaning and disinfecting of the premises.

Once statutory controls are in place the site operators must write to the FHI to get permission to move live fish into, out of, or within the designated area, and to make material changes to the site or site activities. This also applies to fish eggs and gametes.

Published 6 July 2018
Last updated 18 September 2018 + show all updates
  1. List updated with outbreak
  2. List updated with the new outbreak
  3. List updated with a new outbreak
  4. List update with a new outbreak
  5. List updated with a new outbreak
  6. List updated with controls lifted
  7. List has been updated with a new outbreak
  8. List updated with another CD
  9. CD listed updated with a new outbreak confirmed
  10. Updated the outbreak list with new KHV outbreaks
  11. List updated with another KHV confrimed outbreak
  12. List updated with new outbreak
  13. List updated with a new outbreak
  14. Attachment updated
  15. Updated the list for a new outbreak
  16. List of new outbreaks has been updated.
  17. Lifted controls on Swallows
  18. New outbreak has been added to the list
  19. Updated the list of new outbreaks
  20. Updated the new outbreak list
  21. CD04 Included to the list of outbreaks in 2018
  22. First published.