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Centre for Environment, Fisheries and Aquaculture Science gov.uk

Outbreaks of Koi herpesvirus (KHV) disease in 2026

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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

    • 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.

    Sites with KHV disease must undergo a formal monitoring programme 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.

    If a notifiable disease is confirmed, FHI places controls to limit the spread of disease (these are known as confirmed designations). The following conditions are applied under disease controls:

  • No person may, without the previous consent in writing of the FHI, move any aquatic animal including eggs, and gametes, into, out of or within a confirmed designation area.
  • Disposal of dead aquatic animals, including eggs and gametes, must be by an approved method for disposal of Category 2 animal-by-product waste in compliance with local Environmental Health department requirements
  • Notify the Fish Health Inspectorate immediately should mortalities re-occur or spread to other waters/facilities within the designated area.
  • Notify the FHI in advance of all intended physical changes to sites within the designated area - such as site boundaries, number or size of waters, use of the site. FHI written permission will be required beforehand for all such changes.

    • This is an extract. The publication continues at the source.

    Contains public sector information licensed under the Open Government Licence v3.0. Licence

    Read the original at the source: https://www.gov.uk/government/news/outbreaks-of-koi-herpesvirus-khv-disease-in-2026

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    Centre for Environment, Fisheries and Aquaculture Science — imported from official source
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    https://www.gov.uk/government/organisations/centre-for-environment-fisheries-and-aquaculture-science.atom ATOM
    Imported
    September 20, 2026 19:53
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    https://www.gov.uk/government/news/outbreaks-of-koi-herpesvirus-khv-disease-in-2026#202...

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