The adoption of effective fisheries conservation and management measures ('CMM') represents a critical stage in the process of sustainably managing global fishing stocks. It represents the point at which scientific data is integrated with law and policy considerations to generate concrete rules designed to constrain the behaviour of fishers and other stakeholders in order to promote desired conservation goals within a fishery. This paper will examine the fisheries CMM process within the broader framework of international law and policy for marine resource governance. It will consider transparency aspects at key stages of the CMM process including the gathering and sharing of data upon which measures are based, the tabling and negotiation of new measures in RFMO meetings, through to the monitoring and enforcement of CMM to ensure their implementation. At each stage, the paper will seek to explore the potential for transparency initiatives to improve the effectiveness of fisheries CMM in promoting desired conservation and management goals within a fishery.