The steps to kill the fish are:

1. Before stocking the fish, soak it with potassium permanganate solution for 15 to 30 minutes. The concentration of the solution is 100% per cubic meter of water. 20 grams, can kill the anatomy parasites on the gills and body surface of fish species.

2. When the water temperature is 20~30°C, use 90% crystalline trichlorfon and sprinkle it all over the pond. Use 0.2~0.5 grams per cubic meter of pond water, which will have better effects.

3. Sprinkle 1 to 2 grams of trichlorfon powder containing 2.5% for every cubic meter of pool water throughout the pool. The effect is also very good, and the cost is lower than crystalline trichlorfon.

4. Sprinkle the mixture of trichlorfon and alkali all over the pool. The ratio of crystalline trichlorfon to alkali is 1:0.6. Use 0.1~0.24 grams of mixture per cubic meter of pool water. The effect is very good. .

5. Soak the sick fish with 20 mg/L quinine hydrochloride solution.