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Jewel-infection, also known as "jewel disease," is a term that describes a severe and often fatal condition affecting certain fish species, particularly goldfish. This disease is caused by a parasitic protozoan called
Ichthyophthirius multifiliis
, commonly referred to as Ich. It manifests as tiny white spots on the fish's body, fins, and gills, leading to intense itching and irritation. The infection spreads rapidly in densely populated aquariums due to poor water quality, stress, or overcrowding. Symptoms include lethargy, rapid breathing, and eventual death if left untreated. Treatment typically involves administering antifungal medications like formalin or oxytetracycline, though prevention through maintaining clean water, proper filtration, and appropriate stocking density is crucial to avoid outbreaks.