This action implements 2007 specifications and management measures for Atlantic mackerel, squid, and butterfish (MSB) and modifies existing management measures. Specifically, it implements trimester quota allocations for the Loligo squid fishery and establishes the protocol for an inseason adjustment to increase the mackerel harvest, if landings approach harvest limits. Lastly, this final rule clarifies, updates, and corrects existing regulatory language that is misleading or incorrect. This action promotes the utilization and conservation of the MSB resource.