The commercial stationary trawl (Dai) fishery has been operating in the Cambodian Tonle Sap River for more than 100 years. Members of the Wonders of the Mekong project monitored fish catch at the Tonle Sap Dai fishery from November 2021 to March 2022. Team members identified and measured fishes to study the size distribution of various species, and track changes in the catch composition over daily and lunar cycles.