Look at this. I have tried to find it for you. Monopterus albus is naturally warm, sheltered from the wind, afraid of light, afraid of fright and high temperature. Therefore, it is required to build a pond facing the sun, avoiding the north wind and having convenient water sources. In addition, there should be room for planting evergreen trees and vines around the pond. A scientifically constructed eel pond is the foundation of eel breeding. Generally, cement and brick structures are selected to build a semi-underground pond, the appropriate size is 6 ~ 20m2, and the bottom is paved with concrete, and the depth of the pond is about1~1.5m. In order to prevent Monopterus albus from escaping, the corners of the pond are generally round, and the eaves of the pond protrude inward. It has an inlet, an outlet and an overflow. The water inlet is generally 30 ~ 40 cm above the water surface. The water outlet is installed below the mudline to discharge all the pool water. The overflow port is generally located 20 cm above the mud surface. Drain and overflow should be located opposite to the water inlet, and all water inlets should be equipped with metal mesh to prevent escape. After the above work is completed, dealkalization measures should be taken in the cement pool to avoid the decrease of dissolved oxygen and the increase of pH value in the water body, which will cause harm to the cultured Monopterus albus. The method is to dissolve 1kg calcium superphosphate fertilizer or 20g acid sodium phosphate in each cubic meter of water, soak for 2 days, then rinse with clean water before starting the next work.

Second, the quality of the bottom is passed.

Newly-bred farmers often directly use black mud to lay the foundation, which is not enough, because it is not conducive to the cultivation of the habit of digging pits for Monopterus albus, and it will also increase the incidence of Monopterus albus. The correct way is to divide the concrete into three layers. The bottom layer is covered with waste plant straws. Generally, coarse fiber plant waste with good toughness, good air permeability and strong corrosion resistance is selected, and the size is required to match, and the weight ratio of coarse stem, medium stem and broken material can be 5: 3: 2. For example, first lay 1 ~ 2 layers of corn stalks, then lay 20cm thick rape stalks (or bean stalks), then lay 3 ~ 5 layers of crisscross corn stalks or sorghum stalks on it, and finally sprinkle a layer of chaff and a layer of quicklime (about 100 m2, 0.5 kg); The middle layer is a hard clay layer for Monopterus albus to dig holes, with a general thickness of about 30 ~ 40cm；; The top layer can be covered with silt, and the thickness is about 15cm. At the same time, sprinkle a thin layer of quicklime, and finally inject water into the bottom material for disinfection.

Third, the environment

Because the eel likes the hole, there should be water and land in the eel pond. This problem is usually solved by setting mud ridges. The mud ridge is narrow at the top and wide at the bottom, with a bottom width of 40cm and a height of about 40cm. Adjacent mud ridges are connected with each other, and the groove surface is about 30cm wide and deep. Pay attention to scrape off the soft mud at the bottom when piling the mud ridge. Then some aquatic plants, such as cash crops such as rice and water chestnut, can be planted on the mud ridge, and it is best to plant suitable Chinese herbal medicines. In addition, in order to keep out the sun, 2 ~ 3 grapes can be planted on the vegetation at the top of the eel pond according to the size, and the vine layout should be dense in the west and sparse in the east. You can also plant other vines such as loofah and gourd to control the light, especially in summer to block the sun in the west. This creates a relatively suitable and stable small ecological environment for the life of Monopterus albus.