“Together, protecting marine biodiversity: know how to act” was the French governmental conference organized by three ministries in Paris on 12 March 2020. Ministry of Higher Education, Research and Innovation, Ministry of Agriculture and Alimentation, and Ministry for the Ecological and Inclusive Transition along with two research think tanks, Ifremer and OFB have organized the “day of biodiversity”. Participants were mostly researchers, governmental and local officials, business leaders, fishermen, representatives of associations and foundations, all from France. Thus, the language of the conference was French. The conference took place in the 13th century Collège of Bernardins, a former Cistercian college of the historic University of Paris. Experts and audience shared reflections and discussions on major research issues on ocean change, as well as the French position towards global maritime policy in order to find proposals for sustainable management and protection of the ocean.