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Gonad disorders in goldfish

Disorders of sex organs are uncommon in goldfish and challenging to diagnose. Most are found when investigating abnormal swelling of the belly although eggs and blood may also be passed from the vent in some fish. Common goldfish appear to be affected more than fancy varietiesThe subtle clinical features require careful examination under sedation, together with radiography and ultrasound scanning. The exact underlying causes are currently unknown and can be complex, often requiring histological examination of affected tissues. At present, there is no effective prevention or cure although experimental surgery may help some fish.

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