This policy brief informs decision-makers about the benefits of effective marine biodiversity data sharing and proposes measures to encourage and improve sharing among stakeholders. The oceans and coastal areas in Eastern African countries are home to an abundance of marine biodiversity, with immense ecological and socioeconomic value. Stakeholders have varying interests concerning shared ecosystems. Transboundary conservation goals and harmonised coastal management strategies are of great value to sustain ecological services for future generations and to...