noun
- a disease of freshwater fish caused by a parasitic protozoan, characterized by white spots on the skin and gills
Usage: also called ick; common in aquarium fish
Examples
- The goldfish developed ich and needed immediate treatment.
- White spots covering the fish's body are a sign of ich.
- Ich spreads quickly in crowded aquariums if not treated.
- The aquarist added medication to the tank to cure the ich outbreak.