From Florida here and as far as I know there are certain species of fish and coral that can be collected. If you check the florida Fish and Wildlife site there is information regarding what and how many you can have.
Two things I know of that you can not collect. Live Rock and Florida Ricordea Shrooms
. Other than that you have to have proper equipment to capture animals ... ie. Slurp Gun, Nets, bags and containers.
Check the website and you should find some interesting information.
Good Luck ... and I'm about 30 minutes north of Tampa!