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The assessment of the implementation of, and compliance with, agreed obligations is a key component of the internationally accepted fisheries governance regime. To fulfill the objectives of the tuna RFMOs, participants must implement and comply with a range of RFMO obligations. All the tuna RFMOs have recognized a need for a structured process to assess the implementation of, and compliance with, obligations and have adopted compliance assessment processes. Compliance assessment processes provide a framework to assess implementation and compliance in a structured and consistent way and may identify trends in compliance over time. Compliance assessment processes seek to improve the performance of an RFMO and to support participants to better meet their obligations.

This report reviews the transshipment measures of the five tuna RFMOs plus SEAFO and CCAMLR. Although each tuna RFMO generally prohibits at-sea transshipment except for large-scale longline fishing vessels with 100% observer coverage on the carrier vessels, their relationship, the report finds, with other MCS measures leaves multiple gaps and shortfalls. Through the analysis of non-tuna RFMO transshipment measures in critical comparison to the many shortfalls found with existing measures in tuna RFMOs, the report gives detailed recommendations to improve and strengthen tuna RFMO transshipment regulations.

The international community has sought to limit or ban-transshipment at sea due to the difficulty it poses in monitoring IUU fishing and controlling its effects. The WCPFC has banned purse seine vessels operating within the WCPFC Convention Area; however, for longliners and other vessels, the WCPFC merely encourages them to conduct transshipment at sea to the extent practicable. Despite proper infrastructure at port, a precedent of other vessels conducting transshipment at port, and insignificant costs, CCMs have used the "impracticability" test to continue transshipping at sea. This paper proposes replacing the "impracticability" test with bright-line rules to put an end to CCMs' patterns of transshipment at sea.

This report builds on the literature that the ISSF has conducted on analyzing tuna RFMOs transshipment regulations(See 2014-2018 reports). This report reviews the transshipment measures of the five tuna RFMOs plus SEAFO and CCAMLR. Although each tuna RFMO generally prohibits at-sea transshipment except for large-scale longline fishing vessels with 100% observer coverage on the carrier vessels, their relationship, the report finds, with other MCS measures leaves multiple gaps and shortfalls. Through the analysis of non-tuna RFMO transshipment measures in critical comparison to the many shortfalls found with existing measures in tuna RFMOs, the report gives detailed recommendations to improve and strengthen tuna RFMO transshipment regulations.

RFMOs have the role of managing fisheries on the high seas. However, they have been under scrutiny before in their conservation of fish and monitoring and enforcing legislation. With transshipment at high seas becoming an increasingly salient issue, strong RFMO enforcement is ever more needed. This study examined all RFMOs' regulations and gave them a score on stringency. While RFMOs have not become less stringent since the late 1990s, the study concludes that a moratorium on transshipment at sea is needed to alleviate the lack of comprehensive monitoring, control, and surveillance.

The Western and Central Pacific Fisheries Commission (WCPFC) manages fishing activity in the Western and Central Pacific Oceans, one of the largest areas in the world and one of the most valuable fisheries in the world. However, their ability to enforce transshipment rules to prevent IUU fishing is severely lacking due to insufficient funds and resources, specifically when it comes to onboard observers. The observers have failed at monitoring the activities of both the fishing vessel and carrier vessel during transshipment and reporting that information for independent verification. By adopting rules already in use by other t-RFMOs, the WCPF can significantly improve its current transshipment regime.