Copper sulfate, also known as blue vitriol, stone gallbladder, inorganic compound, chemical formula CuSO4, is a transparent dark blue crystal or powder, soluble in water, the aqueous solution is weakly acidic, showing blue. Copper sulfate is an important raw material for the preparation of other copper-containing compounds. Bordeaux mixture can be obtained by mixing with lime milk, which is used as a fungicide for plants and also used as an electrolyte for electrolytic refining of copper.

Copper sulfate is a heavy metal salt. Its hydrolyzed copper ions (Cu2+) can combine with proteins to form protein salts. Copper ions can also form complexes (chelates) when combined with proteins, which can denature and precipitate proteins, thereby causing parasites. Enzymes of insects lose their activity, which has the effect of killing parasites, especially for protoparasites, and has a strong killing effect on protozoa and low-grade algae with colloids. Therefore, it is one of the commonly used drugs in the prevention and treatment of fish diseases, and its efficacy is very good. It can treat and kill the protoparasitic diseases of fish, such as ectoparasitic flagellates, ciliates, flukes, sinensis, etc. Algae plants in water bodies are also lethal.

Adding copper sulfate to livestock and poultry feed also has a significant synergistic effect. Copper sulfate is an important trace element drug additive required for animal feed. Copper can promote the bone marrow to produce red blood cells and is one of the important hematopoietic elements. It is related to the formation of red blood cells and hemoglobin, and is related to the content of catalase, cytochrome C and cytochrome oxidase in the tissues. It also has catalytic iron Complexing and promoting the absorption of methionine.