The key to the success or failure of leech culture lies in technology.

Paddy field: sufficient water resources, good drainage and irrigation. Facilities: construction of ditches, dikes, anti-escape walls and inlets. Density: 8-1000 tails / mu, about 10 days before stocking, applying rotten organic fertilizer 300kg/ mu. Bait: regularly cast once every morning and evening, and feed it in shallow water to ensure that the bait is fresh and remove the residual bait in time. Management: frequently patrol the pond, waterproof leech escape. Processing: 5-10% salt water makes the leeches die, then rinse and dry with clean water.

In addition to opening the market, technology is one of the key factors that determine the success or failure of leech culture. Mastering good technology can not only reduce the input cost and make the risk smaller, but also increase the output and obtain greater profits.

I. Paddy field conditions

The breeding land is usually selected in the paddy field with sufficient water resources, good drainage and convenient irrigation, with an area of 1-2 mu.

II. Major facilities

1. Ditch: dig a ditch with a depth of 1.2m and a width of 2m around the paddy field, and dig a channel with a width of 0.4-0.5m and a width of 0.6-0.8m. The area of the channel is about 25% of the total area of the field, and the channel is connected with each other in the shape of "well" and "abundant".

2. Dike: the width of the dike is 1m and the height is 0.6m.

3. Anti-escape wall and inlet and drain: around the four corners of the rice field, a 0.3m high wall is surrounded by plastic film, and a nylon net is set up at the inlet to prevent leeches from escaping.

3. Rice planting

The rice varieties selected by breeding leeches in rice fields are very important. Rice varieties with long growth period, tough stems, strong tillering and resistance to diseases and insect pests should be selected.

IV. Leech breeding and stocking

Source of leech species can be purchased to the nearest farm, two can also be used in spring and summer with grass soaked in pig blood for trapping, breeding density of about 800-1000 / mu, leech species about 10 days before stocking, application of rotten organic fertilizer 300kg/ mu, can properly cultivate microorganisms and aquatic plants, such as verticillium verticillata, water peanuts, etc.

V. peacetime management

1. Bait

The main results are as follows: (1) the leeches belong to omnivorous animals, which mainly eat microorganisms and floating algae, as well as snail clam meat, pig liver paste and so on.

(2) pay attention to the collocation of meat and vegetables in artificial breeding, such as animal and poultry blood mixed feed or grass powder, etc., and mussels or snails can be put into breeding directly.

(3) the feeding method should be fixed, once every morning and evening at a certain time, feeding at the edge of shallow water in the field, selecting fresh bait and removing the residual bait in time, and the quantity of feeding should be adjusted according to the situation, taking the fullness of leeches as the standard.

2. Fertilization: one-time application of organic fertilizer 3000kg/ mu in rice field, rapeseed cake fertilizer 10kg/ mu, a small amount of many times, topdressing and replenishing leech bait at the same time, which is beneficial to save breeding cost.

3, medication: generally do not use drugs, rice field ecological cycle, and leeches have strong disease resistance, rarely occur diseases.

4. Water quality: the water quality should be safe and pollution-free, the water layer should be maintained around 20cm, the water should be changed once a week, and new water should be injected at the same time.

5. Escape prevention: do a good job in patrolling the pond every day. Once problems such as dike escape walls, intake and drainage facilities are found, timely maintenance should be made to avoid leeches escaping.

6. Processing and sales: leeches are cultivated for about half a year, and the rice can be caught after the harvest, big and small, caught and put into a container, and then 5%, 10%, 10% salt water is added to make it die, and it can be sold after rinsing and drying in clean water. the standard for dry sale of good quality leeches is neat specifications, no impurities, and water content below 20%.

VI. Analysis on the prospect of leech culture

1. Leech has the effect of promoting blood circulation and removing blood stasis and dysmenorrhea, and has high medicinal value. It has been used as a valuable traditional Chinese medicine since ancient times, and it is the main drug ingredient for the treatment of cardiovascular and cerebrovascular diseases. Due to the continuous improvement of these diseases in our country, the use of leeches is also increasing year by year.

2. Due to environment, climate and other factors, there are few wild leech resources. For example, Japan imports a large number of leeches from China every year, which has a large market gap and is a special aquaculture industry with low investment and high efficiency.

3. Leeches are tenacious and can be farmed everywhere, not only at a low cost, but also with quick results, especially at present, which is in the initial stage of artificial breeding of leeches, with a small number and a small scale, and the market is in short supply. it is expected that leeches will be widely farmed as a new type of agriculture in the next few years.