NMFS is implementing approved measures in Amendment 10 to the Atlantic Mackerel, Squid, and Butterfish (MSB) Fishery Management Plan (FMP). Amendment 10 was developed by the Mid-Atlantic Fishery Management Council (Council) to bring the FMP into compliance with Magnuson-Stevens Fishery Conservation and Management Act (Magnuson- Stevens Act) requirements by establishing a rebuilding program that allows the butterfish stock to rebuild and protects the long-term health and stability of the stock; and by minimizing bycatch and the fishing mortality of unavoidable bycatch, to the extent practicable, in the MSB fisheries. Amendment 10 increases the minimum codend mesh size requirement for the Loligo squid (Loligo) fishery; establishes a butterfish rebuilding program with a butterfish mortality cap for the Loligo fishery; establishes a 72-hr trip notification requirement for the Loligo fishery; and requires an annual assessment of the butterfish rebuilding program by the Council's Scientific and Statistical Committee (SSC). This rule also makes minor, technical corrections to the existing regulations.