Fish and fish products are amongst the most highly traded food items in the world today, with most of the world’s countries reporting some fish trade. This assessment of commercial trade in CITES-listed marine species occurs within a broader context of globalization and a more general rapid expansion of the international trade in fish and fish products. It summarizes ten years (2007–2016) of trade in a subset of commercially exploited marine taxa listed in CITES Appendix II. We examine both CITES trade data reporting processes (including information on the practical elements of reporting by CITES Parties) and analyse CITES trade records. The analysis shows how, for Appendix II CITES-listed marine species, the overall number of direct export transactions reported by CITES Parties has increased sevenfold during 1990–2016 and how trade for each CITES-listed marine species sub-group has changed through time. An assessment is made, with assistance from species and trade experts, on the strengths and challenges of collating and reporting on trade in CITES-listed marine species. Additional datasets of relevance to marine species trade are highlighted, and recommendations for further refining and improving CITES trade reporting for marine species are provided.