Fish may have Ichthyophthirius multifiliis without there being anything to see. Fish owners need to be careful about where they get their fish from, as the disease can spread very easily. There are a number of different ways to try to get rid of the parasite. One method is to heat the water to kill the parasites in the water before they can infect the fish. Another method is to add salt to the water, or put the fish into a salt water bath. The water should be changed frequently to remove the parasites. Chemicals are also available which will kill "Ichthyophthirius multifiliis". All these treatments need to be carefully planned for the type of fish species.