Huang Wei's key technology for small ponds

Due to the fact that jaundice is a carnivorous fish, it has the habit of being able to eat each other (eats a small amount of food) when there is a severe shortage of feed. Therefore, in order to carry out high-density intensive cultivation of Astragalus mongolicus, it is necessary to adopt a cement pond, earthen pond, and net cage with a single area of ​​30 square meters or less to carry out the rearing of Astragalus mongolicus in large and small scale (referred to as “small pond dense culture”). Our many years of practice has proved that the adoption of a small pond culture system to cultivate astragalus has many advantages such as convenient management, high survival rate, rapid growth, small footprint, and very significant unit area benefits, and now introduces its key technologies.

I. Design and construction of Koike

At present, there are three types of cages commonly used for aquaculture: cages, cement tanks, and earthen ponds. The specific farming method can be determined according to the local and farmer's own specific conditions: there are fish ponds, reservoirs, and can be used The cages of Astragalus membranaceus should be cultivated; paddy fields with good water storage conditions can be slightly converted into earthen ponds to feed Astragalus membranaceus; if paddy fields with dry land or water storage conditions are not well maintained, it is necessary to build concrete pools.

1, the setting of the cage

The cages for the culture of Astragalus are generally made of durable polyethylene mesh cloth (also known as "screening Juan cloth" and "aluminum cloth"). The cost per square meter is generally 6-10 yuan, and it can be used for about 3 years. The shape of the cage is preferably rectangular, with a bottom area of ​​6-30 square meters and a depth of 1-1.5 meters. The use of nylon thread can be used to securely fasten. If a cage with a water depth of 1.5 meters or less is used to set up the cage, the cage can be fixed directly to the bottom of the tank. If a deepwater pond or a reservoir is used to set up the cage, the floating cage can be set up using waste oil barrels and tires.

2. Construction of earthen ponds

The construction of the earthen pond was actually to convert the rice fields into a small earthen pond with a width of 3 meters and a length of no more than 10 meters by stacking mud. In general, the conversion of 1 mu of paddy field requires only 3,000 yuan, which is currently the most economical way of raising fish. It is required that each pond has a water storage depth of 50 cm or more, and a drainage ditch should be provided between every two rows of pools so that the pool of water in a single pond can be drained when necessary. Each earthen pond is surrounded by polyethylene net cloth to prevent flight: Use a polyethylene mesh cloth with a width of 1 meter or more, bury it 20-30 centimeters under the soil, and use an interface to sew with a nylon thread. The wall is upright to prevent the yellow locust from escaping.

3, the construction of the cement pool

The one-time investment in cement pool construction is relatively large, generally 30-50 yuan per square meter, but the long life cycle (usually more than 20 years), and the management is more convenient, water-saving performance is good, is also currently used by farmers to adopt a method. The size of the cement pool is generally 10-30 square meters. The depth of the pool is 60-80 cm. The probe bricks (made of anti-chocks) in the pool mouth are made into arcs to prevent the jaundice from escaping. The bottom of the tank is concreted with concrete, so that the bottom of the tank is slightly inclined toward the outlet. Set up overflow water pipes on the lower side of the pool: Take two plastic water pipe elbows with a diameter of 5 cm or more, connect them with a length of water pipe that is longer than the thickness of the pool wall, and bury it in the water outlet to make it an elbow In the pool, an elbow is outside the pool. The elbow in the pool is at the lowest level with the bottom of the pool. The elbow outside the pool is plugged with a water pipe of a size appropriate to its size. The length of the water pipe depends on the required depth of the pool water, typically 30-40 cm. A small plastic basket with small holes is snapped on the elbow in the pool and pressed with 1-2 bricks to prevent the yellow plover from running into the overflow pipe. Corresponding drainage ditch shall be set up between every two rows of cement pools, and the block at the lowest place of each ditch shall be set to prevent the jaundice from escaping from the Dianchi Lake.

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