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Bluntnose Sixgill Shark
Threat Level: low
The Bluntnose Sixgill Shark is also
known as Atlantic mud shark, brown shark,
bull dog shark, bull shark, cow shark, gray shark, grey shark, mud
sixgill cow shark, sixgill shark, and sixgilled shark.
- BLUNTNOSE SIXGILL SHARK
Scientific Name.... Hexanchus Griseus
Family Name...... Hexanchidae
- General Information: The bluntnose sixgill
shark has a massive body, with a long and powerful tail. It has
a single dorsal fin that is located to the rear of the body ,
slightly in front of the anal fin below. The eyes are small, and
set on the side of the wide, short-snouted head. This shark has
six pairs of gill slits and there are only two other shark species
that have six gill slits and that is the frill shark and the bigeyed
- Size: The average size of a bluntnose sixgill
shark is approximately 10-16 feet. The adult males range in length
to be about 10 feet long and weigh about 440 pounds and the females
about 13 feet in length and weigh 880 pounds.
- Teeth: The buntnose sixgill shark as six rows
of teeth. They have broad saw-like teeth on each side of its lower
jaw, and the upper jaw has smaller recurved teeth with a single
- Color: They are either gray, olive, green or
brown on the upper side, fading to a paler underside. These sharks
have teardrop- shaped green eyes.
- Feeding Habits: The bluntnose sixgill shark
is a voracious predator, who feeds nocturnally on other large
bony and cartilaginous fishes, such as, flounder, dolphin, bill
fish, hagfish and rays. They can easily cut into bite-sized chunks
with its teeth. Smaller other prey include crab, squid and herring.
They are known to scavenge on sea lions, whales and as well as
bait from long lines set out for other fisheries.
- Social Behaviour: This species has been observed
as a solitary shark. Although there is little known about the
behaviour and migration habits of the bluntnose sixgill shark due
to the depths at which it spends most of its life.
- Habitat | Migration | Distribution: Bluntnose
sixgill sharks are found world-wide in northern and cold temperate
to tropical seas. This shark is primarily a deep water species
and is found both near the bottom and in the water column above
continental and island shelves, at depths of 650-5,400 feet. It
prefers dimly lit or dark waters and to rest along the bottom
during the day and is seen at night near the surface of the open
- Life Span: It is estimated the longevity for
this species is around 80 years.
- Reproduction: This shark is ovoviparity and
can produce up to 100 live young and bout 20 inches long. Little
is known about this sharks biology other than the data from commercial
- Swimming: With its long and powerful tail it
is considered to be a slow but strong swimmer.
- Bluntnose Sixgill Shark Attacks: This shark
has not been reported to attack people without being provoked.
- Population Report: Common.