Buoyancy disorders

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These are common problems, particularly in goldfish and affects long-bodied and short-bodied fancy fish equally. Affected fish may either float uncontrollably at the surface or lie on the bottom and be unable to reach the surface. It can be caused by various problems: polycystic kidneys, excess gas in the bowel, or problems of the swim bladder where it is full of fluid, ruptured, or over-/under-inflated with gas. Taking an X-ray is the main method of diagnosis but most cases are not treatable