Can you eat a dusky shark?
Dusky shark
The dusky shark is a generalist that takes a wide variety of prey from all levels of the water column, though it favors hunting near the bottom. A large individual can consume over a tenth of its body weight at a single sitting. The bite force exerted by a long dusky shark has been measured at over the area at the tip of a tooth. This is the highest figure thus far measured from any shark, though it also reflects the concentration of force at the tooth tip. Dense aggregations of young sharks, forming in response to feeding opportunities, have been documented in the Indian Ocean.
Sailfin roughshark
"Oxynotus paradoxus" is a rare shark found in the deep waters of the ocean from about 265–750 m below ocean level. At birth, "O. paradoxus" is about 25 cm in length and can grow up to 118 cm in length. It has a compressed body form with a blunt snout and a wide, flattened head. "O. paradoxus" has two tall, narrow and pointed dorsal fins that contain concave trailing edges, but no anal fin. The first dorsal spine trails back, a unique feature of this species of "Oxynotus". Both spiracles are relatively small compared to other sharks and are almost completely circular. The top teeth of "O. paradoxus" are lanceolate, but the lower teeth are blade-like. Each set of both upper and lower teeth contain 12 rows of teeth. The flank dermal denticles contain a central cusp next to two lateral cusps and a second middle cusp above the primary cusp.