Le Thi Men, Preston T R, Truong Van Hieu, Duong T Ngan and Huynh Thu Loan 2005: Evaluation of Tra catfish (Pangasius hypophthalmus) residue meal to replace fish meal in diets for fattening pigs in the Mekong Delta of Vietnam.  Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #37. Retrieved, from http://www.mekarn.org/proctu/lemen37.htm