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The fangtooth is a menacing looking creature that inhabits the deep waters of the ocean. It gets its name from the long, sharp, fang-like teeth that line its enormous, over-sized mouth. Its gruesome appearance has earned it the name, "ogrefish". The fangtooth is an extreme deep water species that lives at depths of about 16,000 feet. The pressure at these depths is intense and the water temperature is near freezing. Food here is scarce, so the fangtooth will eat just about anything it can find. Most of its meals probably fall from the upper depths of the ocean. The fangtooth is found throughout the world in temperate and tropical ocean regions.

The fangtooth has a short deep body with a large head and mouth. The body is covered with small prickly scales. The distinct lateral line is an open groove partially covered by scales. There are mucous cavities on the head separated by serrated ridges. The Fangtooth grows to 17cm in length. As the common name suggests, this fish has very long pointed teeth. The lower jaw fangs slide into pockets in the roof of the mouth when the jaws close. This species is dark brown to black.

Adults and juveniles look very different. Juveniles have long head spines and are light grey. They don't begin to look like adults until they reach about 8cm in length. Juveniles eat crustaceans and adults eat fishes.

This species occurs in bathypelagic and mesopelagic depths down to 4992m. It is most common between 500m and 2000m, in temperate marine waters worldwide.