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Fence breeding technology on the beach of the Yangtze River
First, the design and construction of fences The choice of beaches is flat and flat. It is better not to rise until it collapses. It avoids long-term windwards. In the dry season, the width of the beach extends over 100 meters, and the length of the main coastline is 200 meters. The width is relatively open; Lots of rivers entering the river have no sewage discharged into the river. The dam is 20 meters away from the Yangtze River embankment (without affecting the embankment's safety and flood discharge). The embankment has a height of 1 meter, a width of 3 meters and a slope ratio of 1:3 to reduce the impact of water waves. The net perimeter is double-fenced, and the height of the net perimeter is based on the highest historical water level, plus a height of 50 cm or more. The area of ​​aquaculture ponds is generally about 50 mu. It is advisable to use digging trenches to build embankments. Digging canals at the bottom of the aquaculture ponds should be used to dredge the water and provide breeding species for habitat growth, avoiding the cold and sunstroke. The depth of the ditch should be 1.5 to 2 meters and the bottom of the ditch should be flat. Smooth, with a certain degree of inclination (drainage direction), in order to facilitate the discharge of pool water. Second, the breeding methods and breeding techniques Fence breeding usually choose pufferfish, squid, river crab, shrimp and other famous varieties of the Yangtze River, with grass carp, carp, carp, carp and other conventional species. Seed stocking density should not be too high, generally less than 1/3 to 1/2 of pond culture is appropriate. For stocking specifications, it is required to be effective during the year. The stocking of conventional fish is completed before February, and pufferfish, squid, and crabs are stocked before May. (1) Feeding of bait According to different cultured species such as shrimp, crab and fish, the corresponding high-quality palatability feed should be selected, and the dosage should be appropriately adjusted during low tide and dry season, and the use of pelleted feed should be promoted to acclimate and feed. “Four sees, Four sets of "materials to ensure uniform, enough and good. (2) Water quality management When tidewater enters the pond, it is necessary to tide as much as possible to keep the water fresh. It is necessary to strengthen monitoring and management in peacetime and pay attention to the type and quantity of bait to avoid contamination of the water body. When the tide is small, changes in water quality should be based on the actual situation in the local area, and the necessary measures for adding water should be taken in a timely manner. (3) Disease Prevention and Control Based on the principle of “prevention from prevention and prevention and controlâ€, the ecological balance of the water body should be maintained and the occurrence of diseases should be reduced. Systemic disease prevention should be carried out at the same time. The water body should be disinfected, insecticided, and baited to prevent disease. , twice a month, drug rotation. (4) Strengthen inspections Diligently inspect the embankments and nets to ensure that the dams are leak-proof. Check whether the fences are damaged or not. Clean and repair the meshes in time and do a good job of preventing floods and floods and ensure safe production.