The Gulf of Mexico Fishery Management Council has posted online the latest version of its Federal Fishing Regulations for both commercial and recreational fishing. For recreational regulations
http://www.gulfcouncil.org/fishing_regulations/index.php
Federal fishing regulations are not always the same as state fishing regulations. For species that are not managed by federal regulations, states have the authority to extend state rules into federal waters for residents of that state or vessels landing a catch in the state.