NMFS approves and implements Framework Adjustment 12 to the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan. This rule allows the possession of Atlantic mackerel after of the domestic annual harvest is projected to be caught instead of prohibiting the possession of Atlantic mackerel for the rest of the calendar year. This final rule implements this measure because it is necessary to prevent unintended negative economic impacts to other fisheries, such as Atlantic herring.