There are both favorable and harmful aspects to the polyculture of blue crabs and shrimps, and residual shrimp is a disadvantageous factor. However, the blue crabs prey on some sick small shrimps, which have no significant effect on shrimp yield and survival rate. The beneficial aspect is that blue crabs can prey on large-sized baits that can not be used by shrimps, such as snails, oysters, etc., while the remaining residues are palatability feeds for shrimps. The polyculture of shrimps and crabs is based on their favorable factors. The unfavorable factor is to create a living environment that is beneficial to both shrimp and blue crab, so as to improve the utilization efficiency of the pond. Mixed shrimps and crabs can be mainly shrimp, supplemented by crabs, but also can be based on crabs, supplemented by shrimp, shrimp, crabs can also be raised. Polyculture ponds also need to dig 1-2 vertical or horizontal trenches with a width of 2 meters and a depth of 0.5 meters. At the same time, small dams or base soil piles should be built on the beach surface as a hiding place for shrimps and crabs. To prevent the escape of crabs, a 50 cm high wall was built around the pond with plastic sheets or felt. When shrimp is mainly used, about 10,000 shrimps (small seedlings) can be placed per acre, and 300-400 green crabs. When crabs are used as the main, 400-500 crabs per acre and 1000-5000 tails of shrimps should be placed. Not equal. After 3-4 months of cultivation of crabs, up to commercial crabs, survival rate of 15% -35%.
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