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This report analyzed the movements of carrier vessels operating in the Western and Central Pacific Fisheries Commission (WCPFC) Convention area in 2016. Through analysis of AIS data, the report identified carrier vessel voyage patterns and quantity, carrier vessels' flag state patterns, the spatial distribution of potential transshipment on the high seas, and the port visit locations by carrier and flag states. The report also found that many carrier vessels did not transponder on AIS, leading to significant gaps in data on unreported transshipment events. Ultimately, the WCPFC’s management of transshipment in its Convention area is compromised by a lack of reported information on transshipment, coupled with non-compliance with reporting requirements and non-standardized reporting responses by CCMs on carrier vessels and their activities.

The number of reported high-seas transshipment events in the Indian Ocean Tuna Commission (IOTC) Convention Area has increased by over 94% between 2014 and 2018. This growth in transshipment activity has not been met with equal management and monitoring regulations. The Commission implemented Resolution 18-06 requiring that all transshipments occur in port but allows large-scale tuna fishing vessels (LSTVs) to transship at sea if they are authorized by their flag CPC and comply with other specific requirements. However, this paper analyzes transshipment operations reported to have occurred within the IOTC Convention Area and finds that the resolution has flaws and that high-seas transshipment is increasing with insufficient monitoring and compliance. All of these problems are given a recommendation on how to address them.

The Western and Central Pacific Fisheries Commission (WCPFC) has seen a staggering growth in transshipment activity within its Convention Area. Using publicly available information on transshipment
operations within the WCPFC, the WCPFC provides an analysis of transshipment and recognizes the need for additional management rules on transshipment within its Convention Area. Their analysis shows flaws in managing transshipment events and sharing and reporting data between other RFMOs and within their own carrier observers. Implementation of the best practices developed by the Pew Charitable Trusts could be a solution to this issue.