The International Plan of Action to Prevent, Deter and Eliminate Illegal, Unreported and Unregulated Fishing (IPOA-IUU) requires that FAO should further investigate the issue of IUU fishing. This Circular provides a global perspective on initiatives at the international level and by regional fishery bodies or arrangements (RFBs) to combat IUU fishing. This Circular reviews and comparatively analyses responses and action taken by RFBs to prevent, deter and eliminate IUU fishing. It is based on r esponses by RFBs to a questionnaire, and identifies progress in the implementation of the IPOA-IUU. It also analyses common trends and challenges for RFBs in combating IUU fishing, noting common actions and approaches to solutions, as well as any relevant impact on IUU fishing. ...more.