; (ii) shall require revision to the fewest possible provisions of the survey; and (iii) may not unduly burden the ability of such Gulf State to revise the survey. (C) Modified survey (i) Authority to submit If a survey of a Gulf State was denied certification under paragraph (2), the Gulf State may modify the survey and submit the modified survey to the Secretary for certification or denial of certification. (ii) Schedule The Secretary shall make a certification or denial of certification for any modified survey not later than the end of the 30-day period beginning on the date the modified survey is submitted. (iii) Deemed certified A modified survey is deemed to be certified effective upon the expiration of the period described in clause (ii) if the Secretary has not made a certification or denial of certification. . (c) Reduction of barotrauma Section 407 of the Magnuson-Stevens Fishery Conservation and Management Act ( 16 U.S.C. 1883 ) is further amended by adding at the end the following: (i) Reduction of barotrauma Each Gulf State shall develop and promote best practices for use in the red snapper fishery in the Gulf of Mexico to reduce barotrauma. . (d) Construction Section 407 of the Magnuson-Stevens Fishery Conservation and Management Act ( 16 U.S.C. 1883 ) is further amended by adding at the end the following: (j) Construction Nothing in this section may be construed to alter— (1) any commercial catch share program for Gulf of Mexico red snapper; (2) any Federal program related to charter fishing