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Kidney tumours in oscars

In general, kidney tumours are uncommon in fish although they are quite common in oscars, a large south American cichlid. Clinical signs vary but there is usually a distinct swelling of the body just above the vent, which gets progressively larger as the tumour grows in size. Affected fish are often less active, eat less and occasionally have buoyancy problems. Diagnosis can be confirmed by X-ray or an ultrasound scan. There is no treatment and euthanasia should be carried out when the fish has a poor quality of life.

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