Tick N and Preston T R 2012: Effect of biodigester effluent, duckweed and leaves from Taro (Colocacia esculenta) on growth of Tilapia (Oreochromis niloticus) in open ponds. Livestock Research for Rural Development. Volume 24, Article #25. Retrieved , from http://www.lrrd.org/lrrd24/2/tick24025.htm