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Papillomas in koi

Papillomas are non-malignant tumours of the skin and vary in appearance from flat, smooth lumps to large masses with a rough lumpy surface. They can be solitary lesions or there may be several, which coalesce over a large area. Carp pox is also a papilloma, which typically affects koi and carp, but may also affect several tropical fish species. It is caused by a virus, cyprinid herpesvirus 1, and produces a harmless smooth growth on the skin that looks like a drop of white, molten candle wax.

Click here for a case report.

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