Book excerpt: The Third Meeting of the Regional Working Group on Illegal, Unreported and Unregulated (IUU) Fishing, was held in Barbados from 26 to 28 September 2018. The Regional Working Group on Illegal, Unreported and Unregulated (RWG-IUU) Fishing is a joint working group of the Western Central Atlantic Fishery Commission (WECAFC), the Caribbean Regional Fisheries Mechanism (CRFM), and the Organization for Fisheries and Aquaculture of Central America (OSPESCA). A total of 33 experts from 17 WECAFC Members, as well as three inter-governmental organizations, three non-governmental organizations and FAO attended the working group meeting. The working group elaborated recommendations for submission to the WECAFC Scientific Advisory Group on the monitoring and control of transshipment at sea, the application in the region of the technical guidelines on methodologies and indicators for the estimation of the magnitude and impact of illegal, unreported and unregulated (IUU) fishing, and the marking of fishing gear.