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NMFS has reassessed the statutorily mandated findings supporting its January 19, 2021, final rule and Regulations Governing Taking Marine Mammals Incidental to Geophysical Survey Activities in the Gulf of Mexico issued pursuant to the Marine Mammal Protection Act (MMPA), in light of updated information following the discovery that the estimates of incidental take of marine mammals anticipated from the activities, analyzed for the 2021 final rule, were erroneous. This final rule will correct this error and will consider and incorporate other newly available and pertinent information relevant to the analyses supporting some of the findings in the 2021 final rule and the taking allowable under the regulations. The rule will not change the specified activities or the specified geographical region in which those activities would be conducted, nor to the original 5-year period of effectiveness.