Copper sulfate, also known as blue alum and stone gall, is a transparent dark blue crystal or powder, soluble in water, and its solution is weakly acidic. It is a commonly used medicine in the prevention and treatment of fish diseases, such as flagellates, ciliates, pipeworms, Chinese fish fleas and so on. As copper sulfate is a heavy metal salt, the following points should be paid attention to in the process of its use:
1、 The ability of copper sulfate to kill pathogens varies with the change of water environment. Generally speaking, its toxicity increases with the increase of temperature, and decreases with the increase of pH value, organic matter and salt. Therefore, the dosage should be controlled flexibly according to the specific situation of water environment.
2、 The safe concentration range of copper sulfate is small. In general, the concentration of 0.5ppm-0.7ppm copper sulfate is poured in the whole pool or soaked in 8ppm copper sulfate for 20-30 minutes. Therefore, it is necessary to accurately measure the volume of aquaculture water and calculate the dosage correctly.
3、 Excessive copper sulfate can cause necrosis of renal tissue, destruction of hematopoietic tissue and increase of liver fat in fish. At the same time, it may remain in the gills, muscles and liver of fish, hindering the absorption of intestinal tract, thus affecting the feeding and growth of fish, so it can not be used frequently.