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Spindle cell tumours in goldfish

These are the most common skin tumours in goldfish and are so called because of the microscopic shape of the cells. They often start as a small orange patch on the skin, that increases in size over months or years to form a distinct mass. It is not uncommon to find several on the same fish, all at various stages of development. Many get larger, and some become so large that they require surgical removal. Others stay the same size for years, while a few will disappear. No medicines added to the water will change the outcome

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