This rule implements approved measures in Amendment 14 to the Atlantic Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan (FMP). Amendment 14 was developed by the Mid-Atlantic Fishery Management Council (Council) to improve the catch monitoring program for the MSB fisheries, with a focus on better evaluation of the incidental catch of river herring and shad, and to address river herring and shad bycatch issues in the mackerel fishery. The approved measures include: Revising vessel reporting requirements (vessel trip reporting frequency, pre-trip and pre-landing vessel notification requirements, and requirements for vessel monitoring systems); expanding vessel requirements to maximize observer's ability to sample catch at-sea; minimizing the discarding of unsampled catch; and a measure to allow the Council to set a cap on river herring and shad catch in the Atlantic mackerel fishery. NMFS disapproved three measures in Amendment 14: A dealer reporting requirement; a cap that, if achieved, would require vessels discarding catch before it had been sampled by observers (known as slippage) to return to port; and a requirement for increased observer coverage on limited access midwater trawl and small-mesh bottom trawl mackerel trips, coupled with an industry contribution of $325 per day toward observer costs. NMFS disapproved these measures because it determined that they are inconsistent with the Magnuson-Stevens Fishery Conservation and Management Act (MSA) and other applicable law. Therefore, these three measures are not implemented in this action.