In the UK, KHV, a deadly viral disease of fish, is a recognized illness. It can cause widespread fatalities in all types of common and ornamental carp species (Cyprinus carpio).
The following symptoms of KHV disease in fish may appear, especially in waters that are between 16 and 28 °C:
Gill necrotic (white or brown) patches
Sloughing mucus and rough skin patches
Darkened eyes
If you believe there is a KHV outbreak, you must alert the FHI.
For example, fish exhibiting the aforementioned symptoms or carp or carp hybrid fatalities.
There is no danger to the general health.
Following an outbreak, sites with KHV illness must go through a thorough monitoring regimen.
The FHI visit these locations to search for signs of disease and to check that the statutory controls are being followed.
Approved designation
When a notifiable disease is confirmed, FHI implements measures to stop its spread (these are known as confirmed designations).
Under disease controls, the following requirements are implemented:
Moving any aquatic animal, including eggs and gametes, into, out of, or within a confirmed designation area is prohibited without the prior written authorization of the FHI.
Dead aquatic animals, including eggs and gametes, must be disposed of according to local Environmental Health Department regulations using an approved technique for the disposal of Category 2 animal-by-product trash.
In the event that fatalities recur or spread to other waters within the specified area, please notify the Fish Health Inspectorate right away.
Any planned physical changes to sites within the designated area, such as site boundaries, the number or size of waters, or the use of the site, should be communicated to the FHI in advance.
Prior written approval from FHI will be required for all such changes.
Confirmed Designation Notice requires that the FHI receive requests for consents with at least five working days’ notice.
Recent breakouts
The FHI implements statutory procedures to stop the spread of the disease when laboratory testing at a site reveals KHV sickness.
Aquatic animals are unable to move freely due to these constraints.
On July 6, 2022, disease controls were implemented in Conifer Lakes, North Yorkshire (PDF, 309 KB, 1 page)
Norfolk, Coston Lakes – July 25, 2022 (PDF, 331 KB, 1 page)
lifting of disease controls at:
additional information
One can:
view a list of every KHV disease outbreak, along with its locations and controls
Learn more about the KHV illness
Prevent the spread and introduction of the KHV illness
Background
The Aquatic Animal Health (England and Wales) Regulations 2009 list Koi herpesvirus illness (KHV) as a disease.
In the UK, formal controls over KHV outbreaks have been in place since 2007.
For this illness, the UK conducts a surveillance program.
The FHI takes action to contain and, whenever feasible, eradicate the disease whenever an epidemic is confirmed.
Movement restrictions on species that are vulnerable in the affected area, improved biosecurity, fish culling, and cleaning and sanitizing of the facilities could all be part of this.
In order to move live fish into, out of, or within the specified area and to make significant changes to the site or site activities after the statutory controls have been put in place, the site operators must request authorization in writing from the FHI.
Fish eggs and gametes fall under this as well.