The session is introduced by a 10’ video on the context and the wickedproblems in mud crab fisheries in Madagascar and the work undertaken toaddress them since 2019 as part of the CORECRABE European action-researchproject (http://corecrabe.ird.fr/). Based on their own experience, the first andsecond speakers will then explain (10’ each) the role and interest of the fisherysector and the national network of women in fisheries in Madagascar(RENAFEP), respectively, in participating in both the fishery monitoring andthe discussion process through the four regional multi-stakeholder workinggroups that were established by the project. The following speaker (10’) willdescribe the participative and collaborative information system that has beendeployed since 2021 to address recurrent data-deficiency issues, buildtechnical and scientific capacities, and provide accurate fishery indicators(e.g., size structure, fisher census, catch per unit of effort) to the workinggroups. As part of the blue justice agenda in small-scale fisheries, the 4thspeaker (10’) will present the market-driven mechanisms that have drivenfishing effort throughout the value chain and how these mechanisms may beaffected by fishery governance and export rights. the 5th presentation (10’)will further analysis those mechanisms through an empirical bioeconomicmodel for predicting the impacts of the local purchase price (i.e., « vessel price») of mud crab on the stock dynamics and the fishers’ socioeconomic benefits.The final speaker will broaden the scope of both the research and action byhighlighting users’ rights in the mangroves and mapping mud crab fishingpatterns. A short conclusion will highlight the main lessons learnt from thattransdisciplinary action research approach that may inform other research-based interventions in small-scale fisheries and contribute to theimplementation of the SSF Guidelines in African countries.