Gia Binh, Bac Ninh is a district where farmers specialize in rice cultivation. In spite of years of intensive farming, the productivity is still low. The main reasons for this are the large cultivation surface, one crop paddy and unstable yield and productivity. In order to shift the crop and animal structure, Gia Binh has transferred to aquaculture. Newly adopted combining models between rice cultivation and greenclawed crayfish raising, and fish rising... have helped farmers to increase their income.