<P> Injured sea turtles are rescued and rehabilitated (and, if possible, released back to the ocean) by professional organizations, such as the Gumbo Limbo Nature Center in Boca Raton, Florida, the Karen Beasley Sea Turtle Rescue and Rehabilitation Center in Surf City, North Carolina, and Sea Turtles 911 in Hainan, China . </P> <P> One rescued sea turtle, named Nickel for the coin that was found lodged in her throat, lives at the Shedd Aquarium in Chicago . </P> <P> Sea Turtles are believed to have a commensal relationship with some barnacles, in which the barnacles benefit from growing on turtles without harming them . Barnacles are small, hard shelled crustaceans found attached to multiple different substrates below or just above the ocean . The adult barnacle is a sessile organism, however in its larval stage it is planktonic and can move about the water column . The larval stage chooses where to settle and ultimately the habitat for its full adult life, which is typically between 5 and 10 years . A favorite settlement for barnacle larvae is the shell or skin around the neck of sea turtles . The larvae glue themselves to the chosen spot, a thin layer of flesh is wrapped around them and a shell is secreted . Many species of barnacles can settle on any substrate, however some species of barnacles have an obligatory commensal relationship with specific animals, which makes finding a suitable location harder . Around 29 species of "turtle barnacles" have been recorded . However it is not solely on sea turtles that barnacles can be found; other organisms also serve as barnacle's settlements . These organisms include mollusks, whales, decapod crustaceans, manatees and several other groups related to these species . </P> <P> Sea turtle shells are an ideal habitat for adult barnacles for three reasons . Turtles tend to live long lives, around 50 years, so barnacles do not have to worry about host death . Secondly, barnacles are suspension feeders . Sea turtles spend most of their lives swimming and following ocean currents and as water runs along the back of the turtle's shell it passes over the barnacles, providing an almost constant water flow and influx of food particles . Lastly, the long distances and inter-ocean travel these sea turtles swim throughout their lifetime offers the perfect mechanism for dispersal of barnacle larvae . Allowing the barnacle species to distribute themselves throughout global waters is a high fitness advantage of this commensalism . </P>

Why are sea turtles found in all areas of saltwater except for the arctic ocean