NMFS announces final specifications for the 2004 fishing year for Atlantic mackerel, squid, and butterfish (MSB). This action also specifies an increase in the Illex squid catch limit for squid/ butterfish incidental catch permit holders from 5,000 lb (2.27 mt) to 10,000 lb (4.54 mt). In addition, this action corrects the regulations implementing the MSB Fishery Management Plan (FMP) by reinserting regulatory text that was incorrectly removed in the final rule that implemented measures contained in the Atlantic Herring FMP, which was published on December 11, 2000. The intent of this final rule is to promote the development and conservation of the MSB resource.