Generally medium and low-toxic pesticides will not cause poisoning to fish in paddy fields. If it exceeds the normal dosage, severe cases will cause fish poisoning, and lighter ones will also affect the normal growth and development of fish. For some pesticides that dissolve in the environment more slowly, it will also make fish chronic poisoning.
In order to ensure the safety of fish, the fish farming field should deepen the field water in advance when applying various pesticides to control pests. The water layer in rice fields should be kept at 6 cm or more. If the water layer is less than 2 cm, the safety of fish will be met. Bring threats. In the season of occurrence of pests and diseases, the temperature is often high. Generally, pesticides accelerate their evaporation as the temperature rises, and they also increase the toxicity to fish. Appropriate time should be mastered during application. When spraying the liquid, pay attention to spray on rice stems and leaves as much as possible to reduce pesticides falling into the water, so that it is more safe for fish species. The powder should be sprinkled in the morning when the rice plant is exposed to dew, and the liquid agent should be sprayed after sunny dew. Do not apply drugs before it rains. When spraying, the sprayer nozzle should extend below the leaf and spray from below. Soil spraying methods are not advocated. Use more toxic pesticides, you can take one side of the spray, one side change the water; or dry the field water first, driving fish into the fish ditch. In order to prevent the fish density in the ditch from being excessive during the application period and causing water quality deterioration and lack of oxygen, fresh water should be flushed into the ditch every 3 days to 5 days. After the drug power in the fish ditch has disappeared, new water is poured into the rice fields to allow the fish to swim back into the fields.
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