As the main species of shrimp farming in China, China's shrimp was once brilliant in the 1980s and early 1990s, and reached the peak regardless of the scale of cultivation, yield, and export earnings. However, since the shrimp disease raged in 1993, the whole culture has shrunk dramatically. Although there have been one or two alternative varieties after 10 years, the diseases are mostly due to disease, and they are mostly in the state of coarse-grained and low-yield, and it is hard to see the glory of the past. Based on the principles of ecological culture, we have developed a technology for the cultivation of green prawn, which is described as follows: I. Pond dredging During aquaculture, a large amount of organic matter accumulates and precipitates, forming a layer of silt at the bottom of the pool, and some are as thick as 1 meter. This layer of sludge, which is mainly formed of organic matter, is decomposed in an anaerobic environment, and easily produces toxic components, resulting in deterioration of the water environment and causing diseases. From the perspective of the construction of most of the shrimp ponds in the Bohai Rim region, the area of ​​the shrimp ponds is mostly more than 33,000 square meters, and the implementation of large-scale reconstruction costs huge amounts of money and it is unbearable to shrimp farmers. Therefore, it is necessary to start with ecological cultivation and carry out dredging, dipping and oxidation in the fall/winter season to solve the problem of over-thick silt and overgrown weeds, which will create good environmental conditions for shrimp farming in the coming year. Second, ditch grass control The proportion of ditch grass in the entire pond should be less than 40%. Too much will affect the growth of prawns, and even the prawns will become entangled and lethal. Therefore, according to the characteristics of the strong reproductive ability of G. furrow, the characteristics of seeds scattered along with water, and the different conditions in different places and the specific conditions of furrow grass composition, reasonable regulation of furrow grass should be implemented. One is to leave a convective circulation channel and feeding space for shrimp ponds that are completely dredged, with gaps in the ditch and grass areas. The second is for shrimp ponds with poor pollution levels and more ditch grass, 20 cm before bulldozers are used to release water. The bottom surface of the pool of ~30 cm is pushed into the center of the pond to form a rectangular furrowed area, and the four-end surface can be pushed to the pond in the nearest area, leaving a vast space for the growth of the shrimp around the central trench area. This method can be used the following year. The central ditch grass is divided to form two parallel rectangular ditch grass areas. Third, planting ditch grass For shrimp ponds with no or less growth of furrows, furrowed grass seeds should be collected in advance for planting, and the amount of planting should not exceed one-third of the shrimp pond area. The ditch grass seed shape is like the open small pine ball, which is slightly smaller than the peanut, and it is more wild and easy to collect. Fourth, interval drug kill Gully is characterized by diffuse growth. For the purpose of rational distribution and control, when the ditch grass grows to about 3 cm in height in April and May, chemical drugs such as “Pucaojing†will be applied to the planting area in Ngau Tsai Grass. Medicinal herbicide. Sprinkle the herb and extinguish the grass for 2 days to 3 days, then refill the water to prepare shrimp. Fifth, manual removal In the later stage of cultivation, the water quality is fertile and the ditch grass is prosperous, which will hinder the growth of shrimp. At this time, manual cutting can be used to remove or shorten the ditch; the fine steel wire can also be used as a heavy object to enter the water. Both sides are hauled by the motor vehicle to the pool, and the ditch can be cut off to keep the shrimp growing. Great space. Sixth, daily management According to the conditions of shrimp ponds in different regions, generally 0.77 to 23,000 tails of prawns weighing more than 0.7 cm per square kilometer were placed. In day-to-day management, the ditch grass and shrimp growth situation should be considered, and the ditch grass should be purposely increased or decreased through the methods of water intake and drainage and assisted artificial control in order to achieve the ideal breeding effect. Due to the photosynthesis and purification of D. odoratum, it can reduce the number of exchanges of water bodies, use less or no drugs, try to avoid the residue of sulfur substances and antibiotics in the shrimps, and ensure that the shrimp products are pollution-free and pollution-free.