Thin Laternfish, Lampanyctus tenuiformis: The Thin Laternfish has a long slender body that is silvery black in color, being darker around the head and the base of the tail.
They have prominent rows of photophores along the sides and ventrally.
They have transparent anal and dorsal fins and the caudal fin is forked and black in color. The anal and dorsal fins are without spines and contain 13 to 15 and 17 to 19 soft rays respectively.
During the day they are found between 900 and 2,100 feet, and at night between 120 and 1,000 feet (with a maximum abundance at 300 feet) in the water column.
They inhabit all Mexican oceanic waters of the Pacific. They reach a maximum length of 15.3 cm (6.0 inches).
The Thin Laternfish is a member of the Myctophidae Family of Lanternfishes known in Mexico as Linternillas. Presently there are over 230 species from 32 genera of laternfishes known globally and a few are some of the most common fishes in the world.
They are typically small being less than 6 inches with silvery or black colorations with photophores (light producing) arranged in groups along their sides and bellies. They are found worldwide in the mesopelagic (up to 650 feet deep), bathypelagic (from 650 feet to 3,300 feet), and abbysopelagic (from 3,300 to 13,300 feet) zones.
Many species vertically migrate each night towards the surface to feed. Some come all the way to the surface and can be attracted by bright lights and caught with a dipnet. They feed on zooplankton and reproduce via pelagic eggs and have live spans from 1 to 8 years. They are heavily preyed upon by many marine fishes and mammals.