Gulf temps aren't likely even at 50F degrees right now, so not likely ice that you are seeing in the Gulf.
edit: thanks for the water temp links. bouys south of PC show water temp at 55F and 67F degrees as of today. Pensacola bouy close to shore, shows a bit lower temp of 42F today, but as SWGB said, salt water has a lower freezing temp than water with no salinity.