residents are required to be licencedFlorida residents and senior citizens don't need licenses. All others need either or both saltwater and freshwater fishing licenses.

http://myfwc.com/license/
Do I need a freshwater or saltwater fishing license or both? In general, you need a freshwater license to take freshwater fish and a saltwater license to take saltwater fish, unless one of the exemptions specified on this Web site applies to your situation. Obviously if you are fishing in pure fresh water where no saltwater species live, you need a freshwater license and likewise if you are fishing in the ocean you need a saltwater license.
However, when you get into estuarine type areas where salt and fresh water commingle and fish of both types can be found the issue becomes less clear. The interpretation of the rule is:
1. You need either a freshwater, saltwater or combination license (or appropriate exemption) to take fish (take is legally defined as taking, attempting to take, pursuing, molesting, capturing, or killing any fish, or their nests or eggs by any means whether or not such actions result in obtaining possession of such fish or their nests or eggs).
2. If you are using species specific gear, your license should be appropriate (e.g., freshwater or saltwater) to the species you are targeting, and
3. Otherwise you need an appropriate type license to keep your catch and must immediately release any species for which you are not licensed. License requirements follow the species of fish, regardless of where they are caught. In other words, if you only have a freshwater license and are primarily fishing for largemouth bass or bream (freshwater species) in a river, but happen to catch a red drum (a saltwater species), you must immediately release the red drum.
exceptions are :
*Any resident 65 years of age or older, who has in her or his possession proof of age and residency. A free license may be obtained from any tax collector's office upon proof of age and residency.
*Florida residents certified as totally and permanently disabled, who possess a Florida Resident Disabled Person Hunting and Fishing Certificate (see application, requires PDF). See also ADA
if you are unsure of your local laws you can contact florida fish&wildlife via:
http://myfwc.com/permits/