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This proposed rule would implement regulations under the Tuna Conventions Act (TCA), as amended (16 USC 951 et seq ), to implement Resolutions C-25-01 ( Conservation Measures for Tropical Tunas in the Eastern Pacific Ocean During 2026 and 2027-2028 ) and C-25-07 ( Amends and Replaces Resolution C-24-06 on Fish-Aggregating Devices ), which were adopted at the 103rd Meeting of the Inter-American Tropical Tuna Commission (IATTC) in September 2025. The proposed rule would also implement several provisions of Resolution C-19-04 ( Resolution to Mitigate Impacts on Sea Turtles ) that were not previously implemented. Finally, this proposed rule would make technical corrections to citations and hyperlinks in regulations for fishing under the Agreement on the International Dolphin Conservation Program at 50 CFR 216.24 and 50 CFR 300.24 that are outdated and incorrect. This proposed rule would implement fishing management measures for tropical tuna (i.e., bigeye tuna (yellowfin tuna, and skipjack tuna) in the eastern Pacific Ocean (EPO). Resolution C-25-01 continues measures currently in place in 50 CFR part 300, subpart C, including purse seine area closures, bigeye tuna catch limits, active fish aggregating device (FAD) limits, and retention and longline catch limits for bigeye tuna. The proposed rule would reduce the current purse seine closure period from 72 days to 64 days, modify the closure period for class 4 purse seine vessels, and require a one-time vessel assessment fee to pay for tuna tagging research. The Resolution will expire at the end of 2026 unless the scientific advice provided by staff and SAC in 2026 through the management strategy evaluation process confirms the effectiveness of the measures in place in which case the Resolution would remain in force until December 31, 2028.