hmmm, were they really commercial fishermen? If they were catching red snapper and keeping them, here's the problem:
1. Commercial Snapper fishing ends the 10th of each month at noon. They must have landed and sold the fish by then.
2. Here is the web page for checking the present quota and news:
http://www.gulfcouncil.org/
3. Very good to remember that a commercial fishing vessel with shrimp trawl and/or entaglement net on board is only allowed to keep/possess the recreational bag limit of reef fish.
If you think someone is in violation, turn them in by radio, maybe that will help.