Question: what does it mean when goldfish have white spots on them?
Answer: Ich disease, or as it is sometimes incorrectly called, Ick disease, is caused by a protozoan parasite. It is one of the most common parasites of aquarium fish. ... Affected fish will isolate themselves, have clamped fins and become lethargic. Most fish will develop a peppering of white spots on the body and fins.