FWIW, Sea or Rock Salt (without iodine @ 100 lbs. per acre) is VERY beneficial to freshwater fish by greatly improving gill function and by reducing stress. Salt replaces the required electrlytes, prevents nitrite damage to gills, enhances the slime coat, and greatly enhances the gills ability to uptake oxygen. Sea Salt will also add many missing trace elements to improve the growth rate and total weight of fish along with increasing the ponds carrying capacity.
