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Internal tumours in goldfish

Unlike koi, goldfish rarely develop tumours inside the body cavity and those that do tend to be smooth and localised tumours. These are often difficult to identify in the early stages since they rarely cause clinical problems and are usually found by accident. As the tumours increase in size, they may cause asymmetric bulging or swelling of the belly, and sooner or later affect the fish’s health causing it to lose weight or develop secondary problems. Many are spindle cell tumours although histological identification can be difficult. Surgical removal may be possible in some cases although it is high risk, with many potential complications.

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