Bluntnose Sixgill Shark

• anatomíaIt retains a more primitive number of gill slits than most living sharks — six rather than the usual five — a trait it shares with some very ancient lineages.
• It retains six pairs of gills instead of five, a feature it shares with the sharks of the Jurassic and that places it among the oldest lineages of living sharks.
• It rises and falls hundreds of metres every day: it spends the day in the darkness of submarine canyons and climbs at night into shallower water to hunt.
• It is one of the longest-lived and slowest-breeding large sharks: it does not mature until it is past twenty, which makes it extremely vulnerable to deep-sea fishing.

Skeleton type

Vertebrate - cartilaginous skeleton (fish)

Habitat and environment

Continental slopes and submarine canyons of every ocean, between 200 and 2,500 metres

Sexual maturity

25 years

Gestation / incubation

More than 12 months of gestation

Litter / clutch size

70 live young

Sources consulted: https://es.wikipedia.org/wiki/Hexanchus_griseus