Bluefin tuna cage being towed at 1 knot in the central Mediterranean Sea by the Vito Manciaracina, an Italian registered trawler, in the central Mediterranean Sea. Photographed from a helicopter launched from the Greenpeace ship Arctic Sunrise, which is on three month tour 'Defending Our Mediterranean', exposing threats to the sea and calling for a network of marine reserves to restore the health and productivity of the Mediterranean.