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Carcharhinus altimus (Springer, 1950)
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Carcharhinus altimus (Springer, 1950)
  • Photo. (c) 2020 John Nevill.
  • Photo. (c) 2020 John Nevill.
  • Photo. (c) 2020 John Nevill.
Genus: ,

Scientific Name: Carcharhinus altimus

English Name: Bignose shark

Creole Name: Zelron

French Name: Requin babosse

IUCN Red List Status: Near Threatened (NT)



Information

Description:

Heavy-bodied, cylindrical shark, greyish above becoming white below. No conspicuous markings but dusky fin tips (except the pelvics), faint white flank marking. A large, 
long broad snout, long nasal flaps, high triangular saw edged upper teeth. Prominent high and broad interdorsal ridge, large straight pectoral and dorsal fins.

Fins: D1 large (high and broad) angular fin with rounded apex and straight posterior edge to free rear tip. Long almost straight pectoral fins with blackish inner corners.


Size:

Born 70-90cm TL. Maturity: males 190 to 216 cm TL, females 225 cm TL. Maximum length about 300 cm TL.
 


Habitat and Ecology:

Offshore, on deep continental and insular shelf edge and uppermost slopes (depth typically 80 m to at least 250 to 430 m but on occasion shallower, young shallower up to 25m 
and sometimes to the surface). There is some evidence of diurnal vertical migrations.

Eat bony fish, other sharks, stingrays, and cuttlefish.

Viviparous, gives birth every second year with 3-15 pups per litter. Off Madagascar, young are born in September and October.


Fishery Status:

This species is not protected. It is however illegal to fish for sharks with nets (Fisheries Act, Reg 16.c). This species is caught occasionally in the artisanal fishery 
around the “bordage” of the Mahé Plateau. It is known to be caught in the semi-industrial longline fishery with specimens from this fishery sometimes finding their way onto 
the local market. 
 


Notes:

Shares the Creole name “Zelron” with the Sandbar shark (C. plumbeus). First documented as a distinct species in the catch and new record for Seychelles, in 2013 by J. Nevill.


References:

Bray, D.J. (2018). Carcharhinus altimus in Fishes of Australia, http://136.154.202.208/home/species/2879 (06/02/20).

Ebert, D.A. et al. (2013). Sharks of the World – A fully illustrated guide. Wild Nature press ISBN 978-0-9573946-0-5

Froese, R. and D. Pauly. Eds. (2018). Fishbase. https://www.fishbase.se/summary/Carcharhinus-altimus (05/02/20)

Pillans, R. et al. (2009). Carcharhinus altimus. The IUCN Red List 2009: e.T161564A5452406. https://dx.doi.org/10.2305/IUCN.UK.2009.RLTS.T161564A5452406.en.  (05/02/20).

Rigby, C.L. et al. (2020). Carcharhinus altimus. The IUCN Red List 2020: e.T161564A890724. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T161564A890724.en. (04/04/22).
 


Citation:

Nevill, J.E.G. (2020). Carcharhinus altimus, Bignose shark. Seychelles Seatizens. www.seatizens.sc. https://seatizens.sc/species/6713-2/ (Updated 04/04/22).


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