the cultivation methods of leeches are as follows:

1. interplanting in rice fields. As the main activity places of leeches, ditches and gullies are dug in rice fields, generally in the shape of "well" and "cross", and there are two kinds of ditches and gullies. The gullies are required to be evenly distributed and extend in all directions, which is beneficial to the growth and foraging of leeches. Generally, the gullies are .4 meters wide and .3-.5 meters deep, and the gullies account for about 1% of the total area.

second, the mud pond style. A mud pond is dug in the paddy field, which is connected with the paddy field ditch. The width and depth of the ditch are about .4 m and .5-.6 m, accounting for about 15% of the paddy field area. Pay attention to the harm of pesticide application to leeches. Generally, high-efficiency and low-toxicity pesticides are selected, and chemical fertilizers are not used. It is better to use animal manure, which is not only beneficial to rice harvest, but also a good feed for leeches.

third, cement pond culture. Jianshui Mud Pond is about 2 square meters, with a width of 3 meters, a length of 7 meters, a height of 1-1.2 meters and a water depth of .5 meters. Water intake and drainage facilities should be provided, and plants such as aquatic plants should be put in the outdoor cement pond for leeches to inhabit. The newly-built cement pond can't put the leeches immediately, and the alkaline substances (Portland cement, calcium hydroxide, etc.) in the pond body can only be put into seedlings after 2 days of desalination, and the seedlings can't be put into seedlings at one time. After the overall environmental conditions of the breeding pond tend to be balanced in the food chain, the amount of seeds can be gradually increased, generally 1 seeds can be put into every square meter.