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Mouth deformity in koi

This is not uncommon and can be the result of physical injury, bacterial or virus infection, tumours and abnormal bone development. It is often due to localised bacterial ulcerations but occasionally has a sudden onset due to physical bone or joint damage, with the mouth stuck open or closed. The structure is complex, with several bones and joints forming a framework that extends and collapses like a concertina. Close-up examination of the mouth and gill space is required under anaesthetic to determine the cause and treatment options, but recovery is often variable and uncertain.

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