This is a series of 5 Policy Briefs produced under the EU funded PAPUSSA (Production in Aquatic Peri-urban Systems in Southeast Asia) project, a collaborative reserach project of European organisations and Asian partners in Hanoi and Ho Chi Minh City in Vietnam, Phnom Penh in Cambodia, and Bangkok in Thailand (www.papussa.org). Elaboration: Marielle Dubbeling, ETC Urban Agriculture (m.dubbeling@etcnl.nl); language editing: William Lesschen; Graphic design: Zonacuario, Quito, Ecuador. For further contact: David Little, Institute of Aquaculture, University of Stirling, Scotland (dcli@stir.ac.uk).