保持河蟹背青肚白的诀窍池塘养蟹，蟹壳易发黑，且肉味较差，怎样才能在池塘中养出背青肚白的河蟹呢？一是控制池底淤泥。养蟹的池塘，池底要有一定厚度的淤泥层，以利水草及底栖生物繁殖，但淤泥底层厚不能超过２０厘米。二是改善池水水质。河蟹要求池水水质清新，溶氧充... Keep the crabs back green white knack Pond crab, crab shell is easy to black, and the meat is poor, how to raise a back in the pond crab it? First, control the bottom of the mud. Crab ponds, the bottom of the pool to have a certain thickness of silt, to facilitate the breeding of aquatic plants and benthic organisms, but the thickness of the bottom of the sludge can not exceed 20 cm. The second is to improve the water quality. Crab water quality requirements of fresh water, dissolved oxygen filling ...