Leeches that harm Monopterus albus are generally small, mostly half the size of rape, and the big ones are only half the size of mung beans. In the eel pond that has not been completely eliminated, the proportion of Monopterus albus infected with leeches is as high as 90%, and most of them are adsorbed on the skin of head and gills of Monopterus albus. We can usually see some tiny black spots, and we can find their peristalsis by scraping them gently with a blade.
In the process of breeding, once parasites are found on the body surface of Monopterus albus, drugs should be sprayed in time to drive and kill it. The traditional method of killing leeches is to kill leeches with crystal trichlorfon mixed with water. Because trichlorfon is highly toxic, it can kill leeches, but it can also lead to poisoning and even death of Monopterus albus. Although reducing the concentration can reduce the danger, it can't really kill leeches. So, is there any medicine that can completely kill leeches without causing danger to eels?
After years of repeated screening and comparison in eel breeding practice, the public company found that leeches are very sensitive to "Eel Treasure Water Insect Clear", and extremely low concentration can kill leeches, but this concentration has little effect on eels. "Monopterus albus in Chongqing" is the best external insecticide for Monopterus albus discovered by Volkswagen. The usage method is as follows:
1, select the application time. Monopterus albus can start killing leeches after it is put into normal consumption. Generally, it is better to apply it in the morning and evening or on cloudy days, and it is forbidden to apply it in the hot sun.
2. Master the dosage. To kill leeches in cement ponds, generally, every cubic meter of water is flushed with 1.2- 1.5 ml of "one treasure of water" (if the water depth in the eel pond exceeds 30 cm, it is calculated as 30 cm). According to the net area of the cage, 2-2.5ml is used for every 6m2 cage, 3-3.5ml for every 8m2 cage and 3.5-4.5ml for every10m2 cage.
3. Overflow method. It is best to use disposable syringes to measure the liquid medicine in different pools or boxes and sprinkle water. The liquid medicine in each pool or box should be mixed with not less than 5 kilograms of water and overflow as evenly as possible. If the aquatic plants can be washed with clean water before and after administration, the drugs can enter the water more thoroughly. The medicine in the cage can only be sprinkled in areas with aquatic plants, and there is no need to sprinkle medicine in areas without aquatic plants. It is not advisable to change water within 3 hours after spraying, otherwise it is difficult to completely kill leeches.
4. Frequency of medication. During the breeding season, pesticide application can be arranged once a month. In winter and other low-temperature seasons, if leeches are found in eels, they can also be temporarily sprayed with drugs to kill them.
5, medication should strive to be accurate. "Fenbaoshui Chongqing" is very safe at the right concentration, but double use may also cause mild poisoning of Monopterus albus. Overdose can also lead to the poisoning death of Monopterus albus. Therefore, farmers should strive for accurate dosage when using drugs.
Monopterus albus, which completely kills leeches, grows neatly, and it is difficult to find a big-headed and thin "big-headed eel", and the incidence of hemorrhagic disease is relatively small. Killing leeches can be said to be multifaceted.