NMFS is implementing 2016-2018 specifications for Atlantic mackerel and the river herring and shad catch cap for Atlantic mackerel. This action also adjusts the butterfish mesh requirement, clarifies the use of net strengtheners in the butterfish fishery, and suspends indefinitely the pre-trip notification system requirement in the longfin squid fishery. These specifications set catch levels to prevent overfishing and allocate catch to commercial and recreational fisheries. Additionally, the adjustments to gear and reporting requirements in the squid and butterfish fisheries will make operation of the fisheries more efficient and less burdensome. These specifications and management measures are consistent with the Atlantic Mackerel, Squid, and Butterfish Fishery Management Plan and the recommendations of the Mid-Atlantic Fishery Management Council.