High Quality Content by WIKIPEDIA articles! The night shark (Carcharhinus signatus) is a species of requiem shark, family Carcharhinidae, found in the temperate and tropical waters of the Atlantic Ocean. An inhabitant of the outer continental shelf and upper continental slope, this shark most commonly occurs at depths of 50–600 m (160–2,000 ft) and conducts a diel vertical migration, spending the day in deeper water and moving into shallower waters at night. Off northeastern Brazil, large numbers congregate around seamounts of varying depth. A slender, streamlined species, the night shark typically reaches a length of 2 m (6.6 ft). It can be identified by its long pointed snout and large green eyes (when alive), and is dark grayish blue or brown above and white below.