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Osteitis deformans in koi

This rare disease produces dramatic changes to the bones of the spine in koi. Other species may be affected but I have only seen this in four cases in my long career. Affected fish may show some degree of spinal stiffness with reduced flexing and more exaggerated swimming motion of the pectoral fins. The disease is usually found coincidentally on X-rays when looking for other health problems. The underlying cause is not known but it has similarities to Paget's Disease in humans and other animals. There is no known treatment. Click here for a report of cases in Australia.

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