Differences in saltwater license and freshwater license. If you want to fish in both areas, you need both licenses or a combined license. If you fish with a saltwater license and catch a freshwater fish in a saltwater or mixed water area, you must immediately release it. Only people on a boat who actually fish need a license. Even those who only "catch and release" operate requires a license. For Floida Residents, there is a combo license for fishing in both types of waters, for the tourist unfortunately not.
Here are some excerpts:
|Nonresident (visitor)||year license||Freshwater (fresh water)||47 USD|
|Nonresident||year license||Saltwater||47 USD|
|Nonresident||3 day license||Freshwater||17 USD|
|Nonresident||3 day license||Saltwater||17 USD|
|Nonresident||7 day license||Freshwater||30 USD|
|Nonresident||7 day license||Saltwater||30 USD|
|Resident||year license||Freshwater||17 USD|
|R||year license||Freshwater-Saltwater Combo||32.50 USD|
All fees and further information about fishing licenses and rules can be found here: http://myfwc.com/license, It does not hurt that you take a look, because ignorance does not protect in Florida from punishment.