50 CFR §648.105

No person may fish for summer flounder in the EEZ from October 1 to May 7 unless that person is the owner or operator of a fishing vessel issued a commercial summer flounder moratorium permit, or is issued a summer flounder dealer permit, or unless otherwise specified in the conservation-equivalency measures at § 648.107. Persons aboard a commercial vessel that is not eligible for a summer flounder moratorium permit are subject to this recreational fishing season. This time period may be adjusted pursuant to the procedures in § 648.102. Possession of summer flounder harvested from state waters during this time is allowed for state-only permitted vessels when transiting Federal waters within the Block Island Sound Transit Area provided they follow the provisions at § 648.111 and abide by state regulations.