NMFS issues this final rule to implement management measures contained in Framework (FW) 31 of the Northeast Multispecies Fishery Management Plan (FMP). These measures include: An increase in the Gulf of Maine (GOM) cod trip limit to 400 lb (181.4 kg) per day with a maximum possession limit of 4,000 lb (1,814.4 kg); modification of the manner in which allowable trip limit overages are permitted and are calculated; and closure of an inshore area comprising Massachusetts Bay and Stellwagen Bank for February 2000. These measures constitute an inseason adjustment to the measures currently in place. The intent of this rule is to reduce discards in the GOM cod fishery while still achieving mortality objectives of the rebuilding plan in the FMP. In addition, this rule corrects errors contained in the final rule published October 15, 1999 (64 FR 55821), which implemented the approved measures contained in Amendment 9 to the FMP. The October 15, 1999, rule inadvertently omitted regulatory text to implement the approved Atlantic halibut measures.