Chand B K, Goswami A, Biswas P K, Biswas P and Patra B C 2006: Effects of stocking levels of ducks on production of Indian Major Carps in village ponds under duck-fish integrated system in West Bengal state of India. Livestock Research for Rural Development. Volume 18, Article #6. Retrieved , from http://www.lrrd.org/lrrd18/1/chan18006.htm