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Overgrown wen in goldfish

The wen, head growth or ‘cap’, is a growth of soft fleshy tissue on the head of some goldfish varieties such as the oranda, lionhead and ranchu. It has been selected genetically over the years, but in some cases, excessive growth of the tissue can obscure vision, restrict breathing or affect buoyancy. This common problem requires surgical trimming when severe and may need repeating on a regular basis, every 3 to 6 months. The procedure should be carried out under an anaesthetic, with care taken to avoid infection and damage to the eyes. Click here for a scientific report of cases in America.

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