(a) Commercial EEZ closure. The Regional Administrator shall determine the date by which the annual coastwide quota described in §648.232 will be harvested and shall close the EEZ to fishing for spiny dogfish on that date for the remainder of the fishing year by publishing notification in the FEDERAL REGISTER. Upon the closure date, and for the remainder of the fishing year, no vessel may fish for or possess spiny dogfish in the EEZ, nor may vessels issued a spiny dogfish permit under this part land spiny dogfish, nor may dealers issued a Federal permit purchase spiny dogfish from vessels issued a spiny dogfish permit under this part.