I don't know what Florida law is regarding collecting fish from the wild but most countries don't care if you take introduced species from local water ways. They are mostly interested in protecting the native species.
If the OP contacts their local department of fisheries by phone or website, they should be able to find out what restrictions apply to introduced vs endemic species.
Mollies and Gambusia are not endemic to Florida.
If the OP contacts their local department of fisheries by phone or website, they should be able to find out what restrictions apply to introduced vs endemic species.
Mollies and Gambusia are not endemic to Florida.