1. Grass carp is the most susceptible to disease. Breeding pollution-free grass carp should have a special breeding base and form a certain scale. There should be no pollution sources around the base. The breeding base should have sufficient water sources, good water quality, smooth inlet and drainage, independent fish ponds, convenient transportation of fish, rich feed resources, and good ecological and environmental conditions.

2. If you want to raise grass carp well, you must choose healthy and lively high-quality fish species. The parents of self-propagated fish species should come from qualified raw material farms recognized by the country, and the seeds should be pollution-free. It is cultivated, the quality meets relevant standards, and has excellent traits. It is best to breed and breed by yourself if the conditions are met. For example, fish species introduced from other places must pass the quarantine before they can be introduced.

3. Fish must be disinfected before being put in. You can use 20-40 mg/L of chlorine dioxide every 5-10 minutes, 1%-3% salt every 5-20 minutes, and 1%-3% salt every 5-20 minutes. Soak and disinfect with 8 mg/L potassium permanganate every 15-30 minutes and 10-20 mg/L potassium permanganate every 15-30 minutes. The stocking ratio is 80:20, that is, the main grass carp accounts for 80% and the supplementary fish accounts for 20%.

4. Grass carp mainly feeds on aquatic plants in natural waters. In pollution-free breeding in ponds, it is appropriate to use scientifically proportioned pellet feed to reduce the pollution of water quality by residual bait and fully improve the feed utilization rate. The paddy grass fed with it should be tender, fresh and palatable. Cake and other types of bait must be free of mold, pollution, and toxicity, and must be crushed, soaked, cooked, etc. to make bait that is easy for grass carp to eat and digest. Feeding should adhere to the feeding principles of timing, positioning, quality and quantity, and the reasonable feeding amount should also be determined by observing the weather, water conditions and the amount of fish eating.

5. Fishing chemicals are substances used to prevent and treat aquatic animal and plant diseases and insect pests. If used improperly, they can easily remain in fish, causing the fish to be of unqualified quality, so they should be used with caution. Fishery drugs generally include fungicides, insecticides, water quality improvers, etc. Currently, some traditional fishery drugs have been banned, such as chloramphenicol, furazolidone, sodium pentachlorophenate, malachite green, sulfathiazole, tylosin, etc. 32 Fishing drugs cannot be used in aquaculture, so special attention should be paid when selecting fishery drugs.