Eyelight fish or one-fin flashlightfish, Photoblepharon palpebratus. They have subocular bioluminescent organs which it likely uses to attract and find prey, confuse predators, and communicate with other fish. These organs are blinked on and off by the fish using a dark lid that slides up to cover them. Use of only a black lid is unique to Photoblepharon; the other members of its family either rotate the organ into a pouch or employ a pouch-and-shutter method. Indonesia - Composite image