This final rule implements 2011 specifications and management measures for the Atlantic mackerel, squid, and butterfish (MSB) fisheries. Specifically, this action sets quotas for the MSB fisheries, modifies the measure that transfers Loligo squid (Loligo) quota underages from Trimester I to Trimesters II and III by limiting the Trimester II quota increase to no more than 50 percent, and revises the 72-hr pre-trip observer notification requirement for the Loligo fishery to accommodate vessels departing for multiple day trips in a week. These specifications and management measures promote the utilization and conservation of the MSB resource.