Nhi N H Y and Preston T R 2012: Growth of red tilapia (Oreochomis mossambicus) and black tilapia (Oreochomis niloticus) with common carp (Ciprinus carpio) in monoculture and polyculture by using natural feed in ponds fertilized with biodigester effluent. Livestock Research for Rural Development. Volume 24, Article #111. Retrieved , from http://www.lrrd.org/lrrd24/7/nhi24111.htm