Fred Bavendam / Flashlight Fish (Anamalops katoptron) school in the hold of a shipwreck at a depth of 30 meters, Manado, North Sulawesi, Indonesia

Norbert Wu / One-fin Flashlight Fish (Photoblepharon palpebratum) light organ under eye used in mating and attracting prey, Grand Comore Island, Indian Ocean

Juergen Freund / Flashlight fish {Anomalopidae} Indo-pacific

Fred Bavendam / One-fin Flashlight Fish (Photoblepharon palpebratum), Coral Sea, Australia

Juergen Freund / Whip corals + huge Fan coral + Basslets {Pseudanthias sp} + diver with flashlight in background, Papua New Guinea

Norbert Wu / One-fin Flashlight Fish (Photoblepharon palpebratum) light organ under eye used to attract mates and prey, Borneo

Norbert Wu / One-fin Flashlight Fish (Photoblepharon palpebratum) light organ under eye used in mating and attracting prey, Grand Comore Island, Indian Ocean

Flip Nicklin / Inuit Andrew Taqtu investigates seastars, corals and anemones, Arctic