Can also ah, is the unit area is small, the total output is not much. Home raised crabs, planting good water plants, the best perimeter of the grapevine a class of tall plants, set up a good anti-escape nets (necessary), spring April to May water depth of half a meter, 6, 7, 8 deepened to one meter two or so, in September and October down to half a meter. Density control in a square meter can culture 10 crab seedlings. Properly aerated and oxygenated on cloudy and rainy days. Erli river crab breeding base provides.