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Internal tumours in koi

Koi and other carp commonly develop internal tumours, often from 4years of age. These usually develop in the liver or gonad (ovary/testes), but in many the cells are hard to identify and are called a sarcoma. They often cause swelling of the belly with lethargy and progressive loss of appetite and other complications over the following weeks or months. A physical examination and palpation of the swelling may reveal areas of an irregular solid mass internally. This can be confirmed by X-ray or using an ultrasound scan, but most are inoperable, and the outlook is usually hopeless.

Click here for a review of Swiss cases.

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