Now the common insecticides are trichlorfon, avermectin, pyrethroid insecticides, copper sulfate, avermectin, mebendazole and other different chemical types of insecticides.
Trichlorfon
Advantages: Trichlorfon has a good effect on large parasites such as third-generation worms and ring worms. Trichlorfon is matched with copper sulfate and phosphine**The effect is obvious.
Disadvantages: Trichlorfon has a strong paralyzing effect, which is easy to cause fish and shrimp to stop eating, especially for shrimp in the liver transfer stage.
Pyrethroid insecticides
With the decrease of temperature and toxicity becomes greater, in the water quality is thin, the water temperature is lower than 20, this kind of drug to silver carp, bighead carp, crucian carp, etc. toxicity is greater, if splashed along the edge of the pond or when the dilution factor is low, it will cause crucian carp, silver carp to die, so it is best not to use this kind of drug in wintering and early spring. In addition, it should be noted that shrimp and crabs are prohibited from this medicine.
Copper sulphate
Disadvantages: Copper sulfate has a great stimulating effect on the gill tissue of fish. After the use of copper sulfate, there are two *** copper sulfate gill wounds, and after the use of copper sulfate, the mucus of the gill tissue increases, and the traditional statement of astringent wounds is debatable.
Second, copper sulfate is easy to cause hypoxia after use, and within 3 days after the use of copper sulfate (especially the next day), the pond water body is extremely hypoxic. The reason is that the mucus of the guillum tissue and the dead algae affect the respiration of the fish.
Abamectin solution
Avermectin solution is a broad-spectrum antiparasitic drug, which has a good control effect on helminths. When using, pay attention to the whole pool to be evenly sprinkled, otherwise even if the normal amount, or slightly increased, or the dilution factor is low, or the splashing is uneven, it will cause the death of silver carp, crucian carp and other fish.
Mebendazole
1. Advantages. Mebendazole is an ideal drug for the third generation of worms and ring worms, with good killing effect and will not cause fish and shrimp to stop eating.
2. Disadvantages. It is easy to develop drug resistance, and long-term use will affect the ** effect.
Materia medica insect repellent
Why use so many pesticides, and after a while, the parasites come back? Is it really that the medicine is not effective? In fact, parasites can never be killed, the more you kill the weaker the physique, the easier it is to grow worms, and then kill insects, you will fall into a vicious circle, do not kill insects unless necessary, keep the pond water quality and bottom quality good, regularly change the bottom and detoxify, reasonable fertilizer water, ensure that the pond dissolved oxygen is sufficient, maintain the balance of bacteria in the water body, and regularly take herbal deworming: insect control and bacteria, do not hurt the fish, do not spoil the water, in order to replace the killing, but also promote intestinal peristalsis and promote eating;