Sharpnose Sevengill Shark, Heptranchias perlo (Bonnaterre 1788)


Other Names: One-finned Shark, Perlon Shark, Sharpsnout Sevengill Shark, Sharpsnout Seven-gill Shark, Slender Sevengill Shark

A Sharpnose Sevengill Shark, Heptranchias perlo, collected during the 2003 NORFANZ Expedition to survey seamount chains in the Tasman Sea. Source: Mark McGrouther / NORFANZ Founding Parties. License: All rights reserved

Summary:

A  wide-ranging, uncommon shark with the following identifying features:

  • Seven pairs of gill slits
  • A single small dorsal fin
  • Head narrow, snout tapering, pointed
  • Pelvic and anal fins close together
  • Body uniform brown to brownish-grey above, paler below
  • Tips of dorsal and caudal fins dark; pectoral and pelvic fins with pale hind margins.

  • Cite this page as:
    Dianne J. Bray, Heptranchias perlo in Fishes of Australia, accessed 15 Nov 2018, http://fishesofaustralia.net.au/home/species/2000

    Sharpnose Sevengill Shark, Heptranchias perlo (Bonnaterre 1788)

    More Info


    Distribution

    Usually in continental shelf and upper slope depths, although also found inshore, to a depth of 1000 m. Widespread in tropical and temperate waters of the Atlantic, Indian and margins of the Pacific Ocean; usually near the bottom in depths to 1000 m, mostly at 300-600 m.

    Features

    Meristic features.
    Vertebrae: 143-161 (precaudal 89-95)
    Jaw teeth (upper): 8 to 10-9 to 12:10 to 12-9 or 10
    Jaw teeth (lower): 9 or 10-5-1-5-8 to 10

    Body elongate, shallow (body depth about 11% TL); no keels or precaudal pits on caudal peduncle. Head moderately large (approx. 17% TL), narrow; snout tapering, length more than 1.5 times internasal distance; nostrils not connected to mouth by groove; eyes oval; spiracles minute; teeth in upper jaw fang-like, with slender oblique cusp, those laterally with one or two smaller cusps on either side of base, teeth in lower jaw comb-like with six to ten cusps, second distinctly longer than others, distinctive median tooth in lower jaw only, rear teeth in both jaws rudimentary; seven gill slits in front of pectoral fin. 

    Single dorsal fin near tail, above region between ventral and anal fins; anal fin small, height about half height of dorsal fin; caudal fin heterocercal, upper lobe long (approx. 30% TL), with distinct sub- terminal notch, lower lobe short. Pectoral fins moderately small, broad, tip narrowly rounded, hind margin weakly concave.

    Size

    Reaches 140 cm TL.

    Colour

    Brownish-grey above, paler below; margins of pectoral, dorsal and upper caudal fins white in adults; juveniles with dark tips to dorsal and upper caudal-fin, and dark blotches on lower sides; fluorescent green when fresh.

    Feeding

    Carnivore - feeds mostly on squid, bony fishes and crustaceans.

    Biology

    The species is aplacental viviparous (ovoviviparous) - the young develop in eggs that hatch and inside the mother before they are born. Females produce litters of 9-20 pups, each about 25 cm long at birth.

    Fisheries

    Although not targeted, the species is taken as bycatch in deepwater fisheries throughout its range. Flesh reportedly good eating.

    Species Citation

    Squalus perlo Bonnaterre, J.P. 1788. Tableau Encyclopédique et Méthodique des trois Règnes de la Nature. Ichthyologie. Paris. pp. 1-215, 102 pls [10].Type locality: Mediterranean Sea.

    Author

    Dianne J. Bray

    Sharpnose Sevengill Shark, Heptranchias perlo (Bonnaterre 1788)

    References


    Bass, A.J., A'ubrey, J.D. & Kistnasamy, N. 1975. Sharks of the east coast of southern Africa. V. The families Hexanchidae, Chlamydoselachidae, Heterodontidae, Pristiophoridae and Squatinidae. South African Association for Marine Biological Research, Oceanographic Research Institute Investigational Report No. 43.

    Bonnaterre, J.P. 1788. Tableau Encyclopédique et Méthodique des trois Règnes de la Nature. Ichthyologie. Paris. pp. 1-215, 102 pls

    Capapé, C. 1980. New description of Heptranchias perlo (Bonnaterre 1788) (Pisces, Pleurotremata, Hexanchidae). Biological reproduction data and diets of some samples of the Tunisia Coasts. Bull. Off. Natl. Peches (Tunisia) 4(2): 231–264.

    Compagno, L.J.V. 1984. FAO Species Catalogue. Sharks of the World. An annotated and illustrated catalogue of shark species known to date. Hexanchiformes to Lamniformes. FAO Fisheries Synopsis No. 125. Rome : FAO Vol. 4(1) pp. 1-249.

    Compagno, L.J.V. & Niem, V.H. 1998. Hexanchidae, Echinorhinidae, Squalidae. pp. 1208-1232 in Carpenter, K.E. & Niem, V.H. (eds). The Living Marine Resources of the Western Central Pacific. FAO Species Identification Guide for Fisheries Purposes. Rome : FAO Vol. 2 687-1396 pp.

    Compagno, L.J.V., Dando, M. & Fowler, S. 2005. A Field Guide to the Sharks of the World. London : Collins 368 pp.

    Garrick, J.A.F. and Paul, L.J. 1971. Heptranchias dakini Whitley, 1931, a synonym of H. perlo (Bonnaterre, 1788), the sharpnosed sevengill or perlon shark, with notes on sexual dimorphism in this species. Zoology Publications from Victoria University of Wellington (New Zealand) 54: 1–14.

    Kemp, N.R. 1978. Detailed comparisons of the dentitions of extant hexanchid sharks and tertiary hexanchid teeth from South Australia and Victoria, Australia (Selachii : Hexanchidae). Memoirs of the National Museum of Victoria, Melbourne 39: 61-83 figs 1-5 pls 12-15

    Last, P.R. & Stevens, J.D. 1994. Sharks and Rays of Australia. Canberra : CSIRO Australia 513 pp. 84 pls.

    Last, P.R. & Stevens, J.D. 2009. Sharks and Rays of Australia. Collingwood : CSIRO Publishing Australia 2, 550 pp.

    Last, P.R., Scott, E.O.G. & Talbot, F.H. 1983. Fishes of Tasmania. Hobart : Tasmanian Fisheries Development Authority 563 pp. figs.

    Macbeth, W.G., Vandenberg, M. & Graham, K.J. 2008. Identifying Sharks and Rays; a Guide for Commercial Fishers. Sydney : New South Wales Department of Primary Industry 71 pp.

    McCulloch, A.R. 1911. Report on the fishes obtained by the F.I.S. Endeavour on the coasts of New South Wales, Victoria, South Australia and Tasmania. Part 1. Zoological (Biological) Results. Endeavour 1(1): 1-87 figs 1-20 pls 1-16

    Paul, L. & Fowler, S. (SSG Australia & Oceania Regional Workshop, March 2003) 2003. Heptranchias perlo. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 13 September 2012.

    Stead, D.G. 1963. Sharks and Rays of Australian Seas. Sydney : Angus & Robertson 211 pp. 63 figs.

    Stewart, A.L. 2002. At sixes and sevens with four cowsharks. Seafood New Zealand 10(7): 65–68.

    Tanaka, S. & Mizue, K. 1977. Studies on sharks. 11. Reproduction in female Heptranchias perlo. Bulletin of the Faculty of Fisheries Nagasaki University No. 42: 1–9.

    White, W. 2008. Shark Families Heterodontidae to Pristiophoridae. pp. 32-100 in Gomon. M.F., Bray, D.J. & Kuiter, R.H (eds). Fishes of Australia's Southern Coast. Sydney : Reed New Holland 928 pp.

    Whitley, G.P. 1931. New names for Australian fishes. The Australian Zoologist 6(4): 310-334 1 fig. pls 25-27 [310] (as Heptranchias dakini)

    Whitley, G.P. 1940. The Fishes of Australia. Part 1. The sharks, rays, devil-fish, and other primitive fishes of Australia and New Zealand. Sydney : Roy. Zool. Soc. N.S.W. 280 pp. 303 figs.

    Quick Facts


    CAAB Code:37005001

    Behaviour:IUCN Near Threatened

    Depth:to 1000 m, usually 100-400 m

    Habitat:Pelagic, oceanic, deepwater

    Max Size:140 cm TL

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