Introduction
The Bluntnose Sixgill Shark, scientifically known as Hexanchus griseus, is part of the Hexanchidae family. This prehistoric species is present in the world’s oceans, being one of the largest extant shark species.
Conservation Status
The International Union for Conservation of Nature (IUCN) categorizes the Bluntnose Sixgill Shark as Near Threatened. Conservation efforts for this species mainly focus on management measures. For example, limits on fishing depths are being enforced in some areas to protect this deep-sea shark species.
Statistics
| Length (Average) | Length (Range) | Weight (Average) | Weight (Range) | Average Lifespan |
|---|---|---|---|---|
| 15.5 feet | 10-20 feet | 630 pounds | 400-1000 pounds | 80 years |
Distribution
Bluntnose Sixgill Sharks have a global distribution, found in tropical and temperate seas. This species has been observed in regions including the Atlantic, Pacific, and Indian Oceans. Bluntnose Sixgill Sharks are nomadic and known to travel long distances, but specific migration patterns are largely unknown.
Habitats
The Bluntnose Sixgill Shark lives in marine environments, typically in deep waters ranging from 200 to 2500 meters. Still, they can sometimes be found in shallower waters. This species prefеrs cooler temperatures, between 41 and 59 degrees Fahrenheit.
When and Where to See
Bluntnose Sixgill Sharks are typically nocturnal and more likely to be seen during night dives. Observations are more common in summer months when the sharks move to shallower waters.
Best Fishing Locations
Although not typically a target species, these sharks do occasionally show up in commercial catches. They are quite difficult to pinpoint due to their preference for deep water habitats.
How to Catch
Bluntnose Sixgill Sharks are often caught using deep-sea longline methods or by trawling. These fishing techniques allow fishermen to reach the shark’s preferred deep sea habitats.
Identification Guide
Bluntnose Sixgill Sharks have a distinct physical appearance. They are notably large, featuring six gill slits on each side of their broad head, and they have small dorsal fins. These sharks are often a dark, slate-grey colour, and their eyes are fluorescent green.
Culinary
Although not typically consumed in many parts of the world, in some regions bluntnose sixgill shark meat is utilized for food.
Additional Information
The Bluntnose Sixgill Shark is an opportunistic predator, placing it near the top of the food chain, with a varied diet including fish, squid, crabs, seals and even other sharks. However, it is threatened by commercial fishing, where it is often caught unintentionally as bycatch.
References and Further Reading
- Florida Museum – Bluntnose Sixgill Shark
- IUCN Red List – Hexanchus griseus
- FishBase – Hexanchus griseus