Manh L H, Xuan Dung N N, Tuan N D and Le Minh B T 2014: Treating pig waste by fish and water-hyacinth ponds in Vinh Khanh State Farm, An Giang province. Livestock Research for Rural Development. Volume 26, Article #23. Retrieved , from http://www.lrrd.org/lrrd26/2/manh26023.htm