Phan Phuong Loan, Nguyen Huu Yen Nhi, Tran Thi Thanh Van and Tran Phong Phu 2010 Earthworm (Perionyx excavatus) as a main protein source for growing zig-zag eel (Mastacembelus armatus) in small- household aquaculture-based farming systems in the Mekong river delta, Vietnam. International Conference on Livestock, Climate Change and the Environment, An Giang University, Vietnam, 16-18 October 2009  (Editors: Reg Preston and Brian Ogle). httm://www.mekarn.org/workshops/environ/proenv/loan.htm