Ich, or white spot disease, is among the most common ailments in freshwater aquariums. It is caused by the protozoan parasite Ichthyophthirius multifiliis. The parasite forms small white nodules on infected fish's skin, gills, and fins, its most recognisable symptom. The nodules on the skin are where the parasite feeds, protected from the external environment (and any treatments that might be administered). Ich's life cycle includes a free-swimming stage, making it highly contagious and capable of rapid spread throughout an aquarium.
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