Ich, or white spot disease, is a common problem for fish in freshwater aquariums. It is caused by a species of protozoa called Ichthyophthirius multifiliis. The relationship between the
fish and ich is classified as parasitism. Which statement shows that ich is a parasite?
O Ich causes white spots to form on the fish's gills.
Fish with ich usually develop respiratory problems.
O Ich spends part of its life cycle living on the aquarium floor.
O Fish with ich are often observed rubbing against the tank to scratch.
The disease is caused by the ciliate protozoan Ichthyophthirius multifiliis, commonly called ich or ick. Fish infected with ich typically develop small, blister-like, raised lesions (white spots) on the skin and/or fins.
