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An organotroph is an organism that obtains hydrogen or electrons from organic substrates. This term is used in microbiology to classify and describe organisms based on how they obtain electrons for their respiration processes. Some organotrophs such as animals and many bacteria, are also heterotrophs. Organotrophs can be either anaerobic or aerobic. Antonym: Lithotroph, Adjective: Organotrophic.
See also 
 Michael Allaby. "organotroph." A Dictionary of Zoology. 1999, Retrieved March 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-organotroph.html
 The Prokaryotes - A Handbook on the Biology of Bacteria 3rd Ed., Vol 1, CHAPTER 1.4, Prokaryote Characterization and Identiﬁcation 7, Retrieved from http://www.scribd.com/doc/9724380/1The-Prokaryotes-A-Handbook-on-the-Biology-of-Bacteria-3rd-Ed-Vol-1
 Respiration in aquatic ecosystems Paul A. Del Giorgio, Peter J. leB. Williams, Science, 2005, Retrieved April 24, 2012 from http://books.google.com/books?id=pD5RUDW1m7IC&lpg=PP1&pg=PP1#v=onepage&q&f=false
 Phylogenetic structure of unusual aquatic microbial formations in Nullarbor caves, Australia. Andrew J. Holmes1, Niina A. Tujula1, Marita Holley1, Annalisa Contos, Julia M. James, Peter Rogers, Michael R. Gillings1, Article first published online: 20 DEC 2001 Retrieved April 24, 2012 http://dx.doi.org/10.1046/j.1462-2920.2001.00187.x
 Iron reduction by bacteria: range of organisms involved and metals reduced. J. Gwynfryn Jones, William Davison, Steven Gardener. Freshwater Biological Association, The Ferry House, Ambleside, Cumbria, LA22 0LP, U.K., Received 28 September 1983. Accepted 28 September 1983. Available online 10 December 2002. Retrieved April 24, 2012 from http://dx.doi.org/10.1016/j.bbr.2011.03.031