Copper sulfate can prevent and treat fish diseases in fish ponds. Copper sulfate can combine with protein to form protein salt precipitate, so it has a strong ability to kill pathogens. At the same time, copper sulfate can kill green mud moss, water net algae, lake indigo and conus in the pond.

Copper sulfate includes anhydrous copper sulfate and copper sulfate pentahydrate, inorganic compounds, the former is white or grayish white powder, and the latter is transparent dark blue crystal or powder, which loses crystal water when heated. Copper sulfate is not only a fertilizer, but also a widely used fungicide. Bordeaux solution, copper soap solution and copper ammonium preparation are made of copper sulfate, quicklime, soap and ammonium bicarbonate.