Yen Nhi N H, Preston T R, Ogle B and Lundh T 2010: Effect of earthworms as replacement for trash fish and rice field prawns on growth and survival rate of marble goby (Oxyeleotris marmoratus) and Tra catfish (Pangasius hypophthalmus). Livestock Research for Rural Development. Volume 22, Article #204. Retrieved , from http://www.lrrd.org/lrrd22/11/Nhi22204.htm