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Spencer's Edits

To add in taxonomy section, " Hexanchus griseus" comes from the Greek “hexa” meaning six and “ankos” meaning gill. "griseus" comes from Latin for "grey" - don't really have a source just looked up the words.

Not sure where to put: The bluntnose sixgill shark has an average lifespan of 80 years.[1] (Maybe after reproduction and development)

It can be seen near the ocean's surface only at night. These sharks are also known to vary the depth at which they reside with the seasons. Data suggests that this is not due to attempts at thermoregulation but to foraging opportunities.[2]

Since the bluntnose shark has been known to follow patterns of vertical movement, most of the studies to date have been conducted in estuarine system, where the sharks can be found at shallow depths.[3] However, an adult bluntnose sixgill shark was recently seen at a depth of 259 m (854.7 ft) in the Philippines in 2017. On December 2, 2017, the ROV camera

Although sluggish in nature, the bluntnose sixgill shark is capable of attaining high speeds for chasing and catching its prey using its powerful tail. Because of its broad range, it has a wide variety of prey, including fish, rays, chimaeras, squid, crabs, shrimps, seals, and other sharks. The bluntnose sixgill shark is therefore classified as a generalist species, and is less likely to be affected by scarcity in any one of its food sources.[4]

Reproduction is ovoviviparous with embryos receiving nourishment from a yolk sac while remaining inside the mother. Litters are large and typically have 22-108 pups measuring 60–75 cm (24–30 in) at birth, and the largest recorded pup is 82 centimetres (32 in). New pups are also born with a lighter belly color than adults. This form of cryptic coloration or camouflage is used to disguise the pup's appearance. A high mortality rate of the young pups is presumed, owing to the large litter size. Due to the large litter size, it is thought that the pups have a high mortality rate and little to no parental care.[1] *Added citation* The gestation period is unknown, but is probably more than two years.[1] *Added citation* ... Males and females are thought to meet seasonally between May and November.[1] *Added citation*

Also would like to add another picture to diagram characteristics of Hexanchus griseus but am unsure of the copyright issues as well.



Gabby's Edits (in bold)

Females reach sexual maturity at 4.5 m (15 ft) in length and 18–35 years in age,[citation needed] while males reach sexual maturity much earlier at 3.15 m (10.3 ft) [5] in size and 11–14 years in age. *Added citation*

The bluntnose sixgill shark is listed as Near Threatened by the International Union for the Conservation of Nature (IUCN) because, despite its extensive range, its longevity and popularity as a sport fish makes it vulnerable to exploitation and unable to sustain targeted fishing for very long. Although population data is lacking in many areas for this species, certain regional populations have been classified as severely depleted. Although it is usually caught as bycatch, it is also caught for food and sport. It is also widely hunted for its meat and oil [6].

Because of its broad range, it has a wide variety of prey, including fish, rays, chimaeras, squid, crabs, shrimps, seals, and other sharks. It has been observed that both the size and type of prey increases proportionately with the size of the shark, with cetaceans and largely active teleosts becoming increasingly more important to their diet as they grow [7]. The bluntnose sixgill shark is therefore classified as a generalist species, and is less likely to be affected by scarcity in any one of its food sources. The occurrence of epibenthic, mesopelagic and epipelagic prey species in their diet means that these sharks are capable of foraging over a broad range of habitats [8]. However, based on identified prey species, their diet shows that sixgill sharks most frequently forage off the ocean benthos [9].

Teeth of Hexanchus Griseus (Bluntnose sixgill shark).

I added a picture of dentition to compare the teeth in a single photo, rather than in separate photos. This is a drawing, however there is a real photo of this dentition that I would prefer to use, but have to figure out how to insert considering the copyright issues.

I wanted to insert pictures from the following links/ citations, but was having issues doing so:

https://www.discoverlife.org/mp/20p?see=I_RR2851&res=640&flags=glean:

https://www.researchgate.net/profile/Serhat_Albayrak/publication/313009748_Bivalvia_Mollusca_fauna_of_the_Sea_of_Marmara/links/58b7b187a6fdcc2d14d7079a/Bivalvia-Mollusca-fauna-of-the-Sea-of-Marmara.pdf#page=93

Evelyn's Edits (Edits are bold)

Although sluggish in nature, the bluntnose sixgill shark is capable of attaining high speeds for chasing and catching its prey using its powerful tail. Depending on the depth of the ocean, they would either swim and engulf the prey whole, or bite it in order to eat it in pieces. [10] Because of its broad range, it has a wide variety of prey, including fish, rays, chimaeras, squid, crabs, shrimps, seals, and other sharks.[8]

The bluntnose sixgill shark is therefore classified as a generalist species, and is less likely to be affected by scarcity in any one of its food sources.[15] Given the variety of prey, there is not a lot of competition; many hunt in pairs while the largest and smallest are left alone, to avoid any unwanted competition [11]

kin color ranges from tan, through brown, to black. It has a light-colored lateral line down the sides and on the fins' edges, and darker colored spots on the sides. They also get stains/spots on their neural arches, and the number of stains increase as they get older.[4] (This is an edit I did as part of the wikiedu training)

The bluntnose sixgill shark is listed as Near Threatened by the International Union for the Conservation of Nature (IUCN) because, despite its extensive range, its longevity and popularity as a sport fish makes it vulnerable to exploitation and unable to sustain targeted fishing for very long. Although population data is lacking in many areas for this species, certain regional populations have been classified as severely depleted. This is due to the low numbers of sharks caught and therefore not much information can be given. [12] Although it is usually caught as bycatch, it is also caught for food and sport.[1] In June 2018, the New Zealand Department of Conservation classified the bluntnose sixgill shark as "Not Threatened" with the qualifiers "Data Poor" and "Secure Overseas" under the New Zealand Threat Classification System.[16] 

The bluntnose sixgill sharks can grow to 5.5 m (18 ft),[5] and possibly up to 8 m (26 ft).[6] Adult males generally grow between 3.1 and 3.3 m (10 and 11 ft), while adult females generally grow between 3.5 and 4.2 m (11 and 14 ft).
  1. ^ a b c d Bauml, Jessica. "Hexanchus griseus (Bluntnose Sixgill Shark)". Animal Diversity Web. Retrieved 2020-03-11.
  2. ^ "Seasonal and daily movements of the bluntnose sixgill shark ( Hexanchus griseus) in the strait of Georgia from satellite tag data". link.springer.com. Retrieved 2020-03-11.
  3. ^ Comfort, Christina M.; Weng, Kevin C. (2015-05-01). "Vertical habitat and behaviour of the bluntnose sixgill shark in Hawaii". Deep Sea Research Part II: Topical Studies in Oceanography. Biology of Deep-Water Chondrichthyans. 115: 116–126. doi:10.1016/j.dsr2.2014.04.005. ISSN 0967-0645.
  4. ^ https://rdcu.be/b1t3n
  5. ^ Kabasakal, Hakan (2009-05). "On the occurrence of the bluntnose sixgill shark, Hexanchus griseus (Chondrichthyes: Hexanchidae), in the Sea of Marmara". Marine Biodiversity Records. 2: e110. doi:10.1017/S1755267209001018. ISSN 1755-2672. {{cite journal}}: Check date values in: |date= (help)
  6. ^ Sharks & rays. Tricas, Timothy C., Taylor, L. R. (Leighton R.). [Alexandria, VA]: Time-Life Books. 1997. ISBN 0-7835-4940-7. OCLC 36705719.{{cite book}}: CS1 maint: others (link)
  7. ^ Ebert, D. A. (1994-06). "Diet of the sixgill shark Hexanchus griseus off southern Africa". South African Journal of Marine Science. 14 (1): 213–218. doi:10.2989/025776194784287030. ISSN 0257-7615. {{cite journal}}: Check date values in: |date= (help)
  8. ^ Ebert, D. A. (1994-06). "Diet of the sixgill shark Hexanchus griseus off southern Africa". South African Journal of Marine Science. 14 (1): 213–218. doi:10.2989/025776194784287030. ISSN 0257-7615. {{cite journal}}: Check date values in: |date= (help)
  9. ^ Ebert, D. A. (1994-06). "Diet of the sixgill shark Hexanchus griseus off southern Africa". South African Journal of Marine Science. 14 (1): 213–218. doi:10.2989/025776194784287030. ISSN 0257-7615. {{cite journal}}: Check date values in: |date= (help)
  10. ^ http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC4887027&blobtype=pdf
  11. ^ http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC4887027&blobtype=pdf
  12. ^ https://www.researchgate.net/publication/233464335_Catch_Rates_and_Biological_Characteristics_of_Bluntnose_Sixgill_Sharks_in_Puget_Sound
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