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any of the numerous species of small, abundant, deep-sea fish of the family Myctophidae. Lantern fish live in the depths by day, but at night they may approach the surface and can sometimes be attracted to lights. They are somewhat elongated fish with large mouths and eyes and numerous light organs on the head, underside, and tail base. The arrangement of these lights may aid species or sex recognition. The pattern also provides an important means of identifying the 150 or more species. Fully grown lantern fish range from about 2.5 to 15 cm (1 to 6 inches) long.