On dock pilings . . .
Photo Credit: Mote Marine Laboratory
Photo Credit: Mote Marine Laboratory
This is the 1000 ft. pier (shore to 1/4 of the length) at Ft. Desoto Park, St.Petersburg.  July 29, 2000, specimens were found on the on the 3rd and 4th support piling from shore, on the "low" profile jetty directly to the north of the pier, and on the "high" profile concrete rubble farther north of the pier.  The furthest south I have personally seen them was on the fishing pier in Venice.