This document is a synthesis of the major findings and recommendation of a study on the influence of built structures on the fisheries of the Tonle Sap Lake. The multidisciplinary study analysed the influence and impact of built structures on hydrology, fish, and ultimately on people. The project established a database of major structures around the Tonle Sap Lake. Hydrologists modeled the influence of infrastructure on the flow and quality of water. Environmental scientists analysed information about how infrastructure affects the environment. Experts in ecology and fish biology assessed the direct impacts on fisheries. Social scientists and economists evaluated the influence of infrastructure development on people's livelihoods, and studied local people's insights related to the planning, construction, and operation of built structures.