Usage and dosage of copper sulfate for fish ponds: (1) immersion bath: 8 mg/L immersion bath for 20~30 minutes, which can prevent and control fish wave bean worm, ring rot, whipworm and bollworm; For Bell's disease of aquatic organisms such as soft-shelled turtle, the amount of copper sulfate in water can be increased to 10g/m3. (2) Spraying the whole pond: the mixture of copper sulfate and ferrous sulfate is commonly used, with a ratio of 5:2, so that the concentration in the water body reaches 0 respectively. ? 5 g/m3 and 0. 2 g/m3. The concentration of copper sulfate in water can be increased to 1 if the brain mycoses of prawns and crabs are controlled. 0 g/m3. Prevention and control of protozoonosis of freshwater pomfret can make the concentration of copper sulfate in water reach 1. 5 g/m3. (3) Bagging in food field: 3-5 bags are hung on each food table, and each bag contains 65,438+000 g of copper sulfate, but the total dosage shall not exceed that of the whole pool. In the onset season, it should be used 65,438+0 times a week. ? (4) Copper sulfate can be mixed with other drugs: 8 mg/L copper sulfate is combined with 10g/m3 bleaching powder (containing 30% available chlorine), and the bath time is 20~30 minutes (10 ~ 15℃) or 15~20. Copper sulfate and quicklime are used together, dissolved separately and mixed to make Bordeaux solution, so that the concentration in water body reaches 0 respectively. ? 675 g/m3 and 15 g/m3, and immediately spread all over the pond, which can prevent and control many parasitic diseases of fish.