Everyone is aware that salt is commonly used for flavoring and preserving foods. In fact, it is sometimes referred to as the aspirin of aquaculture. Many forms of salt are used, including table, meat-curing, pickling, and rock salt. Of these, the most commonly used and least expensive form is the meat-curing variety. When used properly, salt is employed in treating many external protozoans including Costia, Epistylis, Trichodina, Chilodonella, and the flukes Dactylogyrus and Gyrodactylus.
Salt is used to treat bacterial gill infections and relieve stress during handling and transport.
It also is found to be effective for treating stress associated with nitrite poisoning in ponds. Know the volumes of your tanks, ponds, etc., beforehand. It is advisable to calculate these and have those values in a convenient location for ready use. Perform a test treatment on a few fish before attempting large-scale treatment. Salt, like other chemicals, reacts differently among different species and water qualities.