1, toluidine solution
The toluimidazole solution is mainly used for the prevention and treatment of ringworm disease, pseudo-ringworm, and third-generation insects. When used, it should be diluted with water according to the instructions, and then evenly splashed in the whole pool. The concentration of local drug is strictly prohibited. However, if used in normal dosage, the squid is prone to death, and the scaleless fish and shellfish such as freshwater white peony and channel catfish are sensitive to this drug. Therefore, it should be used according to the type, specification and physical condition of the freshwater fish, and the water quality of the pond. For example, when used in the seed stage, the dose of mebendazole solution should be halved relative to the adult fish. In the case of pond water thinness, the dose should also be cut back.
2. Pyrethroid insecticides
At present, the products such as “fish wormsâ€, “insecticidesâ€, “Xingmianbao†and “Saibokai†sold in the market are all pyrethroid insecticides. According to tests, the pyrethroid insecticides become more toxic with lower temperature. When the water quality is thin and the water temperature is lower than 20 °C, such drugs are more toxic to salmon, trout, squid, etc., if along the pond. When the splash or dilution is low, the squid and squid will die, so it is best not to use this medicine during the winter. Also note that shrimp and crab are banned.
3. Chlorobenzoquinone hydrochloride
Chlorophenylhydrazine hydrochloride is mainly used for the prevention and control of sporozoanosis such as iodine sporangia and sputum iodine in aquatic products, and can effectively inhibit the growth and growth of sporozoites in vitro. This medicine is usually fed with bait, but if the feed is not evenly mixed, it will cause fish poisoning and death, especially the squid is very sensitive to this medicine.
4, avermectin solution
The avermectin solution is a broad-spectrum antiparasitic drug with good control effect on worms. When using, be careful to evenly spill the whole pool. Otherwise, even if the normal dosage, or a slight increase, or the dilution ratio is low, or the unevenness of the splash, the fish such as squid and squid will die.
5, phoxim
The other name of phoxim is "phosphoraphos", "pitrile", "nitrile phosphorus", etc., and is a broad-spectrum insecticide. In fishery production, phoxim is mainly used to kill fish parasites, such as anchor mites, Chinese sturgeon, surimi, and ringworm. Note that phoxim should not be used for scaleless fish such as bigmouth bream and stingray, which is highly toxic to freshwater white carp and carp. Moreover, the residual period of phoxim in the soil pond is long, and the safety interval should be paid attention to when using it. In addition, phoxim cannot be mixed with alkaline substances such as quicklime, sealed when stored, and placed in a dry, cool place.
6, copper sulfate and ferrous sulfate mixture
Copper sulphate and ferrous sulfate mixture (5:2) are generally used to control fish diseases caused by protozoa, such as cryptoflagellosis, fish worm disease, hair worm disease, echinococcosis, rot disease, etc. Fish diseases caused by crustaceans such as Chinese sturgeon. Special attention should be paid to shellfish, shrimps and squid within 30 days of age, and this medicine is prohibited; Guangdong carp, carp, raw fish, gemstones, etc. are sensitive to this drug and need to be used with caution. Oxygen, thin ponds, and fish ponds are appropriately reduced in dosage.
Due to the small safe concentration range of copper sulfate, the volume of the pool water and the dosage should be calculated accurately, and the rescue preparations such as adding water and aeration should be done. Note that copper sulphate cannot be used simultaneously with quicklime.
7, trichlorfon
90% crystal trichlorfon is also a commonly used insecticide on aquaculture, trematode, nematodes, echinoderms and fish fry, fish horns, copepods, larvae and water It has a good killing effect. Special attention should be paid to aquaculture: shrimps, crabs, freshwater white pelicans, etc.; California cockroaches, black mullet, squid, channel catfish, squid, rainbow trout, sea octopus, gemstones, etc. are used with caution.
For the above-mentioned restrictive external insecticides, Mr. Li reminded the majority of farmers: In the early spring, the fish is of poor quality. If the drug is used in normal dosage, it will cause fish to die, and once it causes death, the loss is great. For fish with hepatobiliary syndrome and other visceral diseases, the dose must be reduced, otherwise the fish will die. It is recommended that farmers use pesticides when they are under the guidance of professionals, and should not use drugs.
Special reminder: All insecticide and algae-killing drugs can not be used in the absence of oxygen in the pond, otherwise it will accelerate the pan-tower.
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