Broadnose Shark, Notorynchus cepedianus (Péron 1807)


Other Names: Broadnose Seven Gill Shark, Broadnose Sevengill Shark, Broadnose Seven-gill Shark, Broadsnout, Broad-snout, Broadsnout Sevengill Shark, Broadsnouted Seven-gill Shark, Cow Shark, Cowshark, Ground Shark, Seven Gilled Shark, Sevengill Cowsharks, Sevengill Shark, Seven-gilled Shark, Spottie, Tasmanian Tiger Shark, Tiger Shark

A Broadnose Shark, Notorynchus cepedianus. Source: Ross Robertson / Shorefishes of the tropical eastern Pacific online information system. License: CC BY Attribution-Noncommercial-ShareAlike 3.0

Summary:

A grey to greyish brown speckled and spotted shark with 7 pairs of gill slits, a broad rounded head with a short blunt snout and a singe dorsal fin, far back on the body.

Although quite sluggish, Broadnose Sharks are large, powerful predators, and can be aggressive, particularly if provoked. The species is responsible for a number of attacks on humans in public aquaria - there have been no verified attacks in open water.

Great footage of a female Broadnose Shark (aka Sevengill Sharks) at Millers Point, Cape Town, South Africa. 

Broadnose Sharks (aka cow sharks) off Cape Town, South Africa.


Cite this page as:
Dianne J. Bray, Notorynchus cepedianus in Fishes of Australia, accessed 15 Nov 2018, http://fishesofaustralia.net.au/home/species/2002

Broadnose Shark, Notorynchus cepedianus (Péron 1807)

More Info


Distribution

Found in temperate waters on the continental shelf of southern Australia, from the Sydney Region (New South Wales) to Esperance (Western Australia). Elsewhere almost circumglobal in most temperate seas; absent from the North Atlantic and Mediterranean Sea.

Although large individuals often inhabit offshore waters, they also occur near the bottom in the deeper areas of bays and harbours. Smaller individuals are more commonly found inshore.

The species occurs in depths of 0-136 m, but mostly above 50 m, and often in surface waters. Broadnose Sharks are usually seen cruising over rocky reef habitats, as well as over sandy and muddy bottoms.

Features

Body elongate, shallow (approx. 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

To about 3 m in length.

Feeding

Broadnose Sharks are opportunistic predators. They use their sharp, jagged upper jaw teeth to grab and hold their prey. The large, wide saw-like teeth in the lower jaw are used for cutting and tearing flesh. The species reportedly feeds on a wide range of  bony fishes, sharks and rays, and on seals, dolphins and carrion.

Biology

Broadnose sharks are aplacental viviparous (ovoviviparous) - embryos develop from eggs that hatch in the uterus of the mother. They are nourished via the yolk-sac then absorb nutrients from uterine secretions until they are born. Broadnose sharks have large litters, and pups are born at a length of 40-45 cm. Males mature at 1.5 m, females at 2.2 m.

Fisheries

Broadnose sharks have been heavily fished throughout most of their range. In Australian waters, they are caught by commercial and recreational fishers, and the flesh is marketed as flake.

Conservation

IUCN Red List : Data Deficient

Remarks

Broadnose sharks are unpredictable and can be aggressive if provoked. Although the species is responsible for a number of attacks on humans, none have been recorded in open waters.

Species Citation

Squalus cepedianus Péron, F. 1807. Voyage de Découvertes aux Terres Australes, Fait par Ordre du Gouvernement, sur les Corvettes la Géographe, le Naturaliste et la Goulette le Casuarina, pendant les années 1800, 1801, 1802, 1803 et 1804. Paris : Arthus Bertrand Vol. 1: 337. Type locality: Adventure Bay, Tasmania.

Author

Dianne J. Bray

Resources


Broadnose Shark, Notorynchus cepedianus (Péron 1807)

References


Abrantes KG, Barnett A. 2011. Intrapopulation variations in diet and habitat use in a marine apex predator, the broadnose sevengill shark Notorynchus cepedianus. Mar. Ecol. Progr. Ser. 442: 133-148. Abstract



Bass, A.J., P.C. Hemstra & L.J.V. Compagno, 1986. Hexanchidae. p. 45-47. In M.M. Smith & P.C. Heemstra (eds.) Smiths' sea fishes. MacMillan, South Africa.

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. 2005. Notorynchus cepedianus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.1. Downloaded on 09 July 2012.

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

Daley, R.K., Stevens, J.D., Last, P.R. & Yearsley, G.K. 2002. Field Guide to Australian Sharks & Rays. Hobart : CSIRO Marine Research 84 pp.

Dulvy, N.K. & J.D. Reynolds, 1997. Evolutionary transitions among egg-laying, live-bearing and maternal inputs in sharks and rays. Proc. R. Soc. Lond., Ser. B: Biol. Sci. 264:1309-1315.

Ebert, D.A., 1991. Observations on the predatory behaviour of the sevengill shark Notorynchus cepedianus. South African Journal of Marine Science 11(1): 455-465.

Ebert, D.A. 1996. Biology of the sevengill shark, Notorynchus cepedianus (Peron, 1807), in the temperate coastal waters of southern Africa. South African Journal of Marine Science 17: 93-103.

Fowler, S.L., Cavanagh, R.D., Camhi, M., Burgess, G.H., Cailliet, G.M., Fordham, S.V., Simpfendorfer, C.A. and Musick, J.A. (comps and eds). 2005. Sharks, Rays and Chimaeras: The Status of the Chondrichthyan Fishes. Status Survey. pp. x + 461. IUCN/SSC Shark Specialist Group, IUCN, Gland, Switzerland and Cambridge, UK.

Gomon, M.F., J.C.M. Glover & R.H. Kuiter (eds)  1994. The fishes of Australia's south coast. Flora and Fauna of South Australia Handbooks Committee. State Printer, Adelaide. 1-992.

Hutchins, J.B. & Swainston, R. 1986. Sea Fishes of Southern Australia. Complete field guide for anglers and divers. Perth : Swainston Publishing 180 pp.

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

Kuiter, R.H. 1993. Coastal Fishes of South-eastern Australia. Bathurst : Crawford House Press 437 pp.

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.

May, J.L. & Maxwell, J.G.H. 1986. Field Guide to Trawl Fish from Temperate Waters of Australia. Hobart : CSIRO Division of Marine Research 492 pp.

Péron, F. 1807. Voyage de Découvertes aux Terres Australes, Fait par Ordre du Gouvernement, sur les Corvettes la Géographe, le Naturaliste et la Goulette le Casuarina, pendant les années 1800, 1801, 1802, 1803 et 1804. Paris : Arthus Bertrand Vol. 1 496 pp.

Stehfest, K.M., Patterson, T.A., Barnett, A. & Semmens, J.M. 2014. Intraspecific differences in movement, dive behavior and vertical habitat preferences of a key marine apex predator. Marine Ecology Progress Series 495: 249-262.

Van Dykhuizen, G. & Mollet, H.F. 1992. Growth, age estimation, and feeding of captive sevengill sharks, Notorynchus cepedianus, at the Monterey Bay Aquarium. Australian Journal of Marine and Freshwater Research 43(1): 297-318.

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. 1934. Notes on some Australian sharks. Memoirs of the Queensland Museum 10(4): 180-200 figs 1-4 pls 27-29

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.

Yearsley, G.K., Last, P.R. & Ward, R.D. (eds) 1999. Australian Seafood Handbook. Hobart : CSIRO Marine Research 460 pp.

Quick Facts


CAAB Code:37005002

Conservation:IUCN Data Deficient

Danger:Potentially dangerous to humans

Depth:1-136 m

Habitat:Commercial, recreational fish

Max Size:300 cm TL

Species Image Gallery

Species Maps

CAAB distribution map