Pirate ships are wreaking havoc on Sarasota’s waters. Or, at least what some residents are referring to as a “pirate mooring field” — boats that are improperly docked in Sarasota Bay near Marina Jack. “We have derelict, abandoned, unregistered boats,” resident George Parker said. “These unregistered boats are three or four registrations, three or four owners behind what anybody knows about.” The problem isn’t limited to the downtown bayfront area.