Muddy, tender meat, high nutritional value, export varieties, mainly exported to Japan and South Korea.
First, site selection and construction of aquaculture ponds. Farms should be as reliable as possible water sources, fresh water without pollution, irrigation and drainage. The soil should be selected from neutral, slightly acidic viscous soil or sandy loam soil. In addition, it needs plenty of sunshine and convenient transportation to ensure electricity. The area is generally 100 to 250 square meters. Around the pond, brick and cement must be used to build a 40-cm-high escape protection wall. It is also possible to use plastic plates and other materials to prevent escape. In addition, the use of bricks and cement and the use of compaction with triaxial soil as a means of preventing wall escape are also very economical. You can also use window screens to fence along the perimeter of the pool. The screens are buried in hard soil and the top surface is 20 cm above the water surface. In the middle of the pool there is a connected gutter, which is 30-40 cm lower than the bottom of the pool. The pool depth is 0.8 to 1 meter, and the water depth is maintained at 30 to 50 centimeters. The overflow port is located at the same position as the normal water surface. The water inlet is 20 cm above the water surface. The inlet, outlet, and overflow ports are covered with wire mesh to prevent muddy escaping. The outlet pipe is installed at the bottom of the ditch at the bottom of the pool and is usually sealed with cement.
Second, pool water disinfection and fertilizer. Before the pond is officially filled with water, the advanced water is 10 centimeters deep, and every kilogram of 667 square meters (1 acre) of pond is immediately poured into a slurry with 75 kg of lime. Disinfection, after the end of the water, put enough base fertilizer to fertilize the water body. The transparency of the water is maintained at about 15 cm.

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