Book excerpt: This book examines the legality, adequacy and efficacy of using the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) for commercially-exploited fish species and assesses whether the existing institutional cooperation with the Food and Agriculture Organization (FAO) and regional fisheries management organizations (RFMOs) is efficient. This case-study also provides an interesting lens to approaching wider international law issues. Indeed, finding ways to achieve effective governance of transboundary or global natural resources is central to the peaceful use of oceans and land. Furthermore, the role of science in advising decision-makers is a sensitive issue, which deserves scrutiny and is similar in many regimes. Finally, the complex problem of fragmentation of international law is acute in various fields of environmental law, as in all rapidly developing areas of international regulations.