Ich disease, also known as white spot disease, is a parasitic disease that affects freshwater fish species, and is caused by the ciliated protozoan Ichthyophthirius multifiliis. It’s one of the most common diseases encountered in tropical- fish aquariums. The disease is characterized by the appearance of white spots on the skin, fins, and gills of the infected fish.
The disease is caused by a protozoan sponger that attaches itself to a fish and uses it as a host. Both the saltwater and freshwater forms of the disease have a complex life cycle that makes them difficult to treat. Treatment can involve raising the temperature of the water, adding aquarium salt, and administering drug.
It’s important to note that prevention is crucial in avoiding ich disease. Maintaining good aquarium hygiene, avoiding overfeeding, and quarantining new fish before adding them to an established aquarium are all effective precautionary measures