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 foreign exchange earned through exports. However, since the shrimp disease raged in 1993, the whole culture has shrunk dramatically. Although there have been one or two alternative species after 10 years, the diseases are mostly due to disease. Based on the principles of ecological culture, we have developed a technology for the cultivation of green prawn, which is described as follows:
1. During dredging and aquaculture, a large amount of organic matter accumulates and precipitates, forming a layer of silt at the bottom of the pond, and some are as thick as one 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 often more than 33,000 square meters, and the implementation of large-scale reconstruction costs a huge amount of money and shrimp farmers can hardly afford them. 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. This will create good environmental conditions for shrimp farming in the coming year.
Second, ditch weed control grass ditch in the entire pond accounted for less than 40%, too much will affect the growth of shrimp, shrimp even appear to be wounded to death. 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 control of furrows should be implemented. One is to leave a convective circulation channel and feeding space for shrimp ponds that have relatively thorough dredging, and the ditch and grass areas are distributed at intervals; the second is for shrimp ponds with poor pollution and more ditch grass, and 20 cm of bulldozers before the release of water. The bottom surface of the pool of ~30 cm is pushed into the center of the pond to form a rectangular furrowed area. The four-end surface can be pushed near the pond, leaving a vast space for the growth of the shrimp around the central furrow 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 ditch grass, ditch grass seed should be collected in advance for planting, and its planting amount should not exceed 1/3 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, the interval medicine to kill the ditch grass has the characteristics of diffuse clustering, in order to achieve a reasonable distribution of control purposes, until the ditch grass in April and May to grow to about 3 cm high, the use of "Pucaojing" and other chemical drugs, in the non-ditch Grass planting area for spreading herbicide. Sprinkle the herb and extinguish the grass for 2 days to 3 days, then refill the water to prepare shrimp.
Fifth, artificial elimination In the later stage of cultivation, the water quality is fertile and the ditch grass is prosperous, which will hinder the growth of prawns. 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, the daily management According to different conditions of shrimp ponds, generally every square kilometer put more than 0.7 cm of prawns from 07000 to 23000. 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 residues of sulfur substances and antibiotics in shrimps, and ensure that shrimp products are free of pollution and pollution.
1. During dredging and aquaculture, a large amount of organic matter accumulates and precipitates, forming a layer of silt at the bottom of the pond, and some are as thick as one 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 often more than 33,000 square meters, and the implementation of large-scale reconstruction costs a huge amount of money and shrimp farmers can hardly afford them. 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. This will create good environmental conditions for shrimp farming in the coming year.
Second, ditch weed control grass ditch in the entire pond accounted for less than 40%, too much will affect the growth of shrimp, shrimp even appear to be wounded to death. 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 control of furrows should be implemented. One is to leave a convective circulation channel and feeding space for shrimp ponds that have relatively thorough dredging, and the ditch and grass areas are distributed at intervals; the second is for shrimp ponds with poor pollution and more ditch grass, and 20 cm of bulldozers before the release of water. The bottom surface of the pool of ~30 cm is pushed into the center of the pond to form a rectangular furrowed area. The four-end surface can be pushed near the pond, leaving a vast space for the growth of the shrimp around the central furrow 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 ditch grass, ditch grass seed should be collected in advance for planting, and its planting amount should not exceed 1/3 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, the interval medicine to kill the ditch grass has the characteristics of diffuse clustering, in order to achieve a reasonable distribution of control purposes, until the ditch grass in April and May to grow to about 3 cm high, the use of "Pucaojing" and other chemical drugs, in the non-ditch Grass planting area for spreading herbicide. Sprinkle the herb and extinguish the grass for 2 days to 3 days, then refill the water to prepare shrimp.
Fifth, artificial elimination In the later stage of cultivation, the water quality is fertile and the ditch grass is prosperous, which will hinder the growth of prawns. 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, the daily management According to different conditions of shrimp ponds, generally every square kilometer put more than 0.7 cm of prawns from 07000 to 23000. 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 residues of sulfur substances and antibiotics in shrimps, and ensure that shrimp products are free of pollution and pollution.
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