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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.

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.

The inadequate regulatory control and monitoring of transshipment, especially at sea, create gaps that enable illicit activity. Recognizing this inadequacy and its consequences, the Pew Charitable Trusts calls for a ban on transshipment until best practices are implemented. They outline multiple best practices across three categories, reporting, monitoring, and data-sharing. By implementing these practices, all parties can be assured that adequate guidelines are in place to make transshipment a more effective and safe practice, not contributing to IUU fishing.