FISH4ACP is an initiative of the Organization of African, Caribbean and Pacific States (OACPS) to support sustainable fisheries and aquaculture development. The five-year value chain (VC) development programme (2020 to 2025) is implemented by the Food and Agriculture Organization of the United Nations (FAO) with funding from the European Union and the German Federal Ministry for Economic Cooperation and Development (BMZ). The mangrove oyster value chain in the Gambia is one of 12 VCs competitively selected from over 70 proposals worldwide for support from the FISH4ACP programme. This report presents the outputs of analysis and design work completed in 2022 to conclude a functional analysis of the VC, assess its sustainability and resilience, develop an upgrading strategy to which the FISH4ACP programme will contribute, and plan for full implementation from January 2023.