Leech breeding methods: swamp and mud pond breeding;
There are abundant aquatic plants, organic matter and humus, plankton and aquatic plants in swamps and mud ponds. Therefore, as long as the fence is built to prevent escape and Sentinel Prime invasion. This model has low investment cost and troublesome management and salvage.
Interplanting in paddy field
Digging ditches in rice fields is the main place for leeches to move. Hmm? ,? Ten? Isomorphic excavation can be divided into ditch sliding excavation and mud pit excavation. It is required that gullies are evenly distributed and extend in all directions, which is beneficial to the growth and foraging of leeches. Generally, gullies are 0.4m wide and 0.3-0.5m deep, accounting for about 10% of the total area. Mud pond type is to dig a mud pond in paddy field and connect it with paddy field ditch. The width and depth of the ditch are about 0.4 m and 0.5-0.6 m respectively, accounting for about 15% of the paddy field area. Pay attention to the harm of pesticide application to leeches in paddy fields. Generally, pesticides with high efficiency and low toxicity are selected instead of chemical fertilizers. It is best to use animal manure, which is not only beneficial to rice harvest, but also a good feed for leeches.
Cement pond culture
Jianshui Mud Pond is about 20 square meters, 3 meters wide, 7 meters long and 1 meter high? 1.2m, with a water depth of 0.5m Water intake and drainage facilities should be set up, and aquatic plants and other plants should be put in the outdoor cement pool for leeches to inhabit. Leeches and alkaline substances (Portland cement, calcium hydroxide, etc.) cannot be put in the newly-built cement pool immediately. ) the seedlings in the pond can only be released after 20 days of desalination, and the seedlings cannot be released at one time. After the overall environmental conditions of the aquaculture pond tend to be balanced in the food chain, the number of seeds can be gradually increased, generally per square meter 100.
Standardized intensive cultivation:
It is suggested that the pond should be 90 meters long, 7-8 meters wide, 1.2 meters deep-1.5 meters deep and 0.5 meters deep -0.6 meters deep. Good water intake and drainage facilities should be established, soil habitat should be built, and aquatic plants should be planted on it for sun protection, and 40-mesh polyethylene nets should be used as escape prevention measures. Generally, 2000 kinds of leeches are put into each mu of water.
The appearance of leech is slightly flat, which looks like a cylinder at first glance, with a length of about 2 ~ 15 cm and a width of about 2 mm ~ 1.5 cm. The back is green with black, with five yellow longitudinal stripes, and the abdomen is flat, gray-green, and there are no spots. The overall ring pattern is remarkable, and the body segment is composed of five rings, each of which has the same width. 10 eyes, display? The three semicircular jaws are arranged in a Y shape. When sucking the animal's body, the jaw is used to drill into the skin. The car body is large, with a length of 60- 120mm and a width of 13- 14mm. The back is dark green with five vertical stripes. It absorbs blood and stores it in the whole digestive tract and blind sac from pharynx to esophagus. All parts of the body have drainage holes, which open on the ventral side. The distance between male and female reproductive holes is 4 rings, and each opening is between rings. The front sucker is easier to see, and the rear sucker is more obvious, with strong adsorption.
Leeches are distributed in lakes, ponds and paddy fields in most areas of China. Mainly produced in Weishan, Dongping, Nanyang Lake and other lakes in Shandong Province, Weishan Lake has the largest output, which is not only supplied to this province, but also sold to Northeast China, Hebei, Shanxi and other places. Some products produced in the suburbs of Suzhou and Wuxian in Jiangsu are also exported. In addition, Zhejiang, Anhui, Hunan, Hubei, Sichuan, Shaanxi, Hebei, Liaoning, Jilin, Heilongjiang and other places also have production and sales.
Leeches live in paddy fields, ditches and shallow polluted pits and ponds, and are addicted to human and animal blood. They are very agile. They can swim in waves and move inchworms. Warm spring is active every year, and the spawning period is from June to 10. In winter, I often crouch in the wet mud on the shore, and I have strong viability.