WHAT TO LOOK FOR
This is a medium-sized cylindrical shark with a short, blunt snout, and thick, fringed lips. Its spineless dorsal fins originate behind the pectoral fin rear tips, with the base closer to the pectoral than the pelvic fin bases; the second dorsal fin is larger. It has a weak ventral caudal fin lobe, and most of the posterior margins of its fins are translucent.
Brown to blackish.
When born, the shark is approximately 1 ft [30 cm] long. Males mature at a length of 2.5 to 5.2 ft [77 to 159 cm], while females mature at 3.8 to 5.2 ft [117 -159 cm]. Their maximum length is 5.2 to 6 ft [1.59 to 1.82 m].
Lower teeth are serrated.
They prefer deepwater between 121.4 to 5905.5 ft [37 to 1800 m], but mainly live over 656.2 ft [200 m] deep. They frequent warm-temperate and tropical outer continental and insular shelves and slopes, usually on or near the bottom.
Atlantic, Indian, and Pacific Oceans.
Prey – Mainly deepwater fishes, but may take bites out of large, live prey.
Reproduction – Ovoviviparous with 10-16 pups per litter.
They hover above the bottom (large oil-filled liver provides neutral buoyancy), and they swim well off the bottom. They are solitary hunters.
Fisheries use them for meat and the squalene, causing rapid depletion of their populations.