Section 635.34 - Adjustment of management measures(a) NMFS may adjust the IBQ shares or resultant allocations for bluefin tuna, as specified in § 635.15 ; catch limits for bluefin tuna, as specified in § 635.23 ; the overall, regional, and/or sub-regional quotas for bluefin tuna, sharks, swordfish, and northern albacore tuna as specified in § 635.27 ; the retention limits for sharks, as specified at § 635.24 ; the regional retention limits for Swordfish General Commercial permit holders, as specified at § 635.24 ; the marlin landing limit, as specified in § 635.27(d) ; and the minimum sizes for Atlantic blue marlin, white marlin, and roundscale spearfish as specified in § 635.20 .(b) In accordance with the framework procedures in the 2006 Consolidated HMS FMP, NMFS may establish or modify for species or species groups of Atlantic HMS the following management measures: Maximum sustainable yield or optimum yield based on the latest stock assessment or updates in the SAFE report; domestic quotas; recreational and commercial retention limits, including target catch requirements; size limits; fishing years or fishing seasons; shark fishing regions, or regional and/or sub-regional quotas; species in the management unit and the specification of the species groups to which they belong; species in the prohibited shark species group; classification system within shark species groups; permitting and reporting requirements; workshop requirements; the IBQ shares or resultant allocations for BFT; administration of the IBQ program (including but not limited to requirements pertaining to leasing of IBQ allocations, regional or minimum IBQ share requirements, IBQ share caps (individual or by category), permanent sale of shares, NED IBQ rules, etc.); de minimis BFT quota set-aside for new entrants and associated requirements, process and conditions; time/area restrictions; allocations among user groups; gear prohibitions, modifications, or use restriction; effort restrictions; observer coverage requirements; EM requirements; essential fish habitat; and actions to implement ICCAT recommendations, as appropriate.(c) NMFS may add species to the prohibited shark species group specified in heading D, Prohibited Sharks, of Table 1 of appendix A to this part if, after considering the criteria in paragraphs (c)(1) through (4) of this section, the species is determined to meet at least two of the criteria. Alternatively, NMFS may remove species from the prohibited shark species group and place them in the appropriate shark species group in Table 1 of appendix A if, after considering the criteria in paragraphs (c)(1) through (4) of this section, NMFS determines the species only meets one criterion.(1) Biological information indicates that the stock warrants protection.(2) Information indicates that the species is rarely encountered or observed caught in HMS fisheries.(3) Information indicates that the species is not commonly encountered or observed caught as bycatch in fishing operations for species other than HMS.(4) The species is difficult to distinguish from other prohibited species.(d) When considering a framework adjustment to add, change, or modify time/area closures and/or gear restricted areas, NMFS will consider, consistent with the FMP, the Magnuson-Stevens Act and other applicable law, but is not limited to the following criteria: Any Endangered Species Act related issues, concerns, or requirements, including applicable BiOps; bycatch rates of protected species, prohibited HMS, or non-target species both within the specified or potential closure area(s) and throughout the fishery; bycatch rates and post-release mortality rates of bycatch species associated with different gear types; new or updated landings, bycatch, and fishing effort data; evidence or research indicating that changes to fishing gear and/or fishing practices can significantly reduce bycatch; social and economic impacts; and the practicability of implementing new or modified closures compared to other bycatch reduction options. If the species is an ICCAT managed species, NMFS will also consider the overall effect of the U.S.'s catch on that species before implementing time/area closures, gear restricted areas, or access to closed areas.64 FR 29135, May 28, 1999, as amended at 68 FR 74788 , Dec. 24, 2003; 71 FR 58173 , Oct. 2, 2006; 75 FR 57702 , Sept. 22, 2010; 78 FR 52031 , Aug. 21, 2013; 79 FR 71606 , Dec. 2, 2014; 80 FR 50102 , Aug. 18, 2015; 83 FR 33157 , July 17, 2018; 87 FR 60007 , Oct. 3, 2022 83 FR 33157 , 7/17/2018; 87 FR 60007 , 1/1/2023