In aquaculture, the purpose of using fishery drugs is to prevent diseases of aquatic animals and regulate water quality. Then, how to use fishery medicine correctly and effectively has become a very important link. Among them, the whole pool spraying method, also known as spreading method, is the most commonly used method in the prevention and treatment of fish diseases, which can kill parasites, bacteria and viruses on fish body surface and gills and in water in a short time, and has the advantages of quick effect and high curative effect, and is suitable for small water bodies, ponds, cages, cement pools and so on. How to spread fishery medicine evenly in the whole pond is a technology that aquaculture farmers must master. Many kinds of fishery drugs are spilled drugs. However, some farmers often use the whole pool splashing method inappropriately or carelessly, which leads to poor medication effect and even aggravates the outbreak of diseases, which not only increases costs, wastes labor, but also may cause great losses.

1, don't sprinkle medicine in the morning. Because of the low dissolved oxygen content and low temperature in the water in the morning, it is easy to cause the floating head of fish to die. The overflow time is generally 9~ 1 1 or 3~5 pm. Photosensitive drugs should be used at night.

2. Don't sprinkle medicine in rainy days and other abnormal weather conditions. Rainy days, thunderstorms and low-pressure weather are not suitable for spraying drugs, especially irritating disinfectants. Because in rainy days, the photosynthesis of algae tubes is insufficient, and the water body is easy to lack oxygen. In order to improve the effect, it is best to apply pesticide on sunny days.

Don't sprinkle medicine when the fish is floating. Don't spill the fish during the floating head and when the floating head just disappears. The reason of floating head should be found out, and the medicine can only be sprinkled after the floating head is eliminated.

4. Don't sprinkle medicine when the fish is hungry. When fish are hungry, it is easy to grab medicine and cause poisoning.

5. Don't use metal utensils to hold drugs. Fish medicines are mostly chemical compounds, and some medicines easily react with metals, especially chlorine preparations, and the composition and properties of medicines will change chemically.

6. Don't sprinkle drugs. It is necessary to use drugs scientifically and strictly control the dosage to prevent drug overdose. At the same time, emergency measures should be taken before spilling drugs, and fish should be observed on the spot for a period of time, usually 2~4 hours, and attention should be paid to whether there is any abnormality in fish activities. If there is any abnormality, handle it in time.