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Second, field collection (a) the collection of the environment and time any animal has its own set of living environment, from the appropriate conditions for survival of the environment, or a sudden change in the environment, it will cause a lot of death, or even extinction. The living environment of the leech is also fixed through long-term evolution, heredity, and adaptation. Therefore, it should be collected according to the living habits of leech. The collection of environmental places is where the wild leeches often appear, such as where the water flow is relatively large. The time of collection is best during the peak activity of the otters, such as 8 to 10 in the morning and 4 to 6 in the afternoon.
(II) Collection methods and tools There are many methods and tools for collecting leeches. They should be able to adapt randomly and select and innovate. Generally, two methods, manual direct collection and food inducement collection, can be used. Using food inducement is a method of collecting leeches that saves manpower and time. It is based on the activity season, life patterns, activity time, and smoking habits of leeches to capture traps. According to doctor's habits of sucking vertebrate blood, the bones of large animals can be used to lure fresh pig blood (brown oxen with bovine blood). When a large number of leeches crawl on the bones, fishnets can be used to remove bones and make bones. Separate from the otters. Of course, when food is used to entice wide-body golden thread ticks, the mollusk body can be used as a decoy. When a large number of leeches arrive, they can be caught with fishnets.
Third, the selection and demerits Whether it is to introduce good breed breeding, or wild wild leeches collected in the wild as a provenance, there is a problem of selection and inferior, especially in the breeding process, it is more important to choose superior and inferior. The purpose of raising the otters artificially is to reproduce the otters, that is, to obtain a large number of breeding offspring and obtain high yields, thereby obtaining better economic benefits. In order to obtain high yields and good economic returns, the fine breed is the key to internal breeding. The quality of the cultivar is directly related to the growth and reproduction performance of the otters. In a large number of collected leeches, their health and development status will not be exactly the same. Therefore, the economic benefits must be improved by selecting superior varieties with strong adaptability, rapid growth, and high spawning rate.
IV. Collecting eggs from leeches Artificial hatching Egg pods collected from leeches are generally found in the middle or late April of each year. After a small hole with a diameter of about 1.5 cm is found in wet soils such as sewers, river banks, and lakesides, You can dig in the small hole and you can collect foamy leeches. Be careful when collecting eggs. Do not use forceful grips, as this will damage the embryos in the eggs. The collected eggs should be placed in the incubator in time. Incubators can use common plastic basins, boxes, etc. The size of the incubator should be determined by the amount of eggs laid. In the incubator, first put a layer of 1 to 2 cm thick sand and mud, the moisture content of the sand and mud is between 40% and 50%. Place the end of the pods with the small holes upside and place them neatly in the incubator. Cover the surface with a layer of damp gauze or layers of gauze to increase the humidity in the incubator. Outside the incubator, use a plastic bag (available food plastic bag) to wrap tightly to prevent evaporation of water from the incubator. After about 20 days, young cubs can be naturally hatched. Artificial hatching by collecting eggs from leeches is also a simple and easy way to obtain a large number of provenances.
V. Problems to be Solved in Collection and Introduction (I) When collecting and introducing records in the field, the records should be carried with you. All matters related to the collection must be recorded in detail. For example, the time, location, water area, and surrounding environment. If the collected leeches are selected as breeding frogs after being selected, they can refer to the records to create suitable living conditions. Through records, we must also grasp the occurrence of wild leeches and the law of generations in order to sum up experience and raise awareness.
(II) Disinfection Treatment Regardless of whether it is a source of seeds or a kind of blisters collected from the wild, it must be disinfected so that it does not infect the disease, causing abandonment of its predecessors, or even annihilation. The disinfection method is as follows.
1 . Isolation and rearing The seedlings newly introduced or collected from the wild are placed in separate breeding ponds. After a few days of observation, if there are no deaths, anorexia, snoring, body darkening, dullness, and elasticity, the discharged feces Normal, confirmed as disease-free, can be placed in a normal breeding pond or polyculture with other leeches.
2 . Drug treatment Prior to placing in the isolation pond, a 0.5% to 1% formalin disinfecting solution was applied and the blisters were rinsed again. It can also be cleaned with other disinfectants. The purpose is to eliminate the pathogens of the blisters.
How to introduce leech
I. Artificial introduction Artificial introduction is a measure by which a breeder purchases a kind of leeches from a farmer or farm (base) that has been reared successfully. In the introduction of species should be carefully selected, we must strictly select the species in line with the standards of Chinese herbal medicine for feeding, reduce blindness and unnecessary economic losses. At present, the most widely bred are the Japanese doctor's orders, wide-bodied golden crickets, and brown crickets. However, no matter which type of water frog is selected for breeding, the original farm should be investigated and analyzed, and compared with its own established farm to determine whether it is suitable for rearing. Individual selection should focus on selecting individuals who are vigorous, full-bodied, body-smooth, and both shiny and flexible. The healthy body not only has a high survival rate, but also has a strong ability to resist diseases and insect pests, and it also has a strong fecundity. When introducing, it is best to select good varieties from nearby units. If introducing from outside, it is best to get in touch with relevant scientific research departments, solicit their opinions, obtain guidance and help, and reduce unnecessary losses.