Koi Herpesvirus (KHV) Disease Outbreaks in 2026: What You Need to Know
Understanding Koi Herpesvirus Disease
Koi Herpesvirus (KHV) is a significant viral infection affecting fish, particularly common and ornamental carp species (Cyprinus carpio). This disease is officially recognised in the United Kingdom and poses a serious threat, often leading to substantial mortality rates among affected populations. The symptoms of KHV typically manifest when water temperatures are maintained between 16 to 28 °C, with affected fish displaying distinct signs including:
Necrotic patches (either white or brown) on the gills
Rough patches on the skin accompanied by sloughing mucous
Sunken eyes
If there is any suspicion of a KHV outbreak, it is imperative to contact the Fish Health Inspectorate (FHI). This includes observing the aforementioned symptoms or noting any deaths ...










