What sickness in fish makes them swell and causes a fuzzy look?

Question

The eyes are sometimes fuzzy.

Answer 1

There are a couple of diseases that could fit these descriptions.

As far as the swelling, the causes could be as minor as constipation or as serious as dropsy (this is a symprtom, not an actual condition, as it has a number of causes - the main characteristic is that the body swells from not being able to get rid of fluids, and the swelling makes the scales stick up away from the body like a pine cone).

As to the "fuzzy", this could be caused by Saprolegnia or Achlya (usually lumped together as "Saprolegnia" or "body fungus", even though neither is considered a fungus any longer) or Columnaris, a bacterial infection which appears more like a fungus. The two can be separated because Columnaris has shorter filaments which tend to be matted, rather than long and straight so the individual filaments can be distinguished. Columnaris typically has a circular outline, where "fungal" infections are irregular in thier shape.

Answer 2

fuzzy eyes is probably a bacterial infection. swelling could be too -- but it could also be a lot of things.

my best suggestion is keep your water cleaner -- do gravel vacuums and 20-25% water changes weekly.