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Overview

Brief Summary

Biology

Despite the bronze whaler being a fairly common species, its biology is relatively poorly known due to confusion with other species (3). It is a viviparous shark, and thus the embryos develop within the mother and are provided nutrition via a yolk-sac placenta. Gestation is thought to last for about one year, after which a litter of 13 to 24 pups, measuring 59 to 70 centimetres, are born. Male bronze whalers reach maturity at around 13 years; females are mature at around 20 years (5). Schools of adult and juvenile bronze whalers appear to segregate. Juveniles are present in shallow water all year round, whilst adults are found inshore only in spring and summer. Adult males occur in subtropical regions throughout the year, whereas females and immature sharks migrate to these regions during winter, and then return to temperate regions (and inshore) in the spring to breed (1). However, despite this migration, there is very little movement between adjacent regional populations (5). Nursery areas tend to be large and ill defined but include shallow banks, large shallow bays, inlets and harbours as well as the open coast (1). Bronze whalers can be found singly, or in loose schools of up to one hundred individuals (1). They feed on bony fishes, such as sardines, mullets, hake and soles, as well as other prey such as sawfish, squid and cuttlefish (3) (5). Large numbers follow the winter sardine run off the southern Natal coast, South Africa to feast on one of their preferred prey (5). This powerful and fast shark is considered to be a dangerous species, and there have been a few provoked and unprovoked attacks on swimmers and divers (3).
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Description

Named for its bronze, or sometimes greyish-bronze upperside, this is a large, fairly slender shark with a moderately long and slightly pointed snout. The underside is white, and most of the fins have inconspicuous darker edges and dusky to black tips. Both the large, pointed first dorsal fin and the long pectoral fins are sickle-shaped. Often, a prominent white band runs down the flanks (3). Its common name 'whaler' arose in the nineteenth century, due to their habit of congregating around the carcasses of harpooned whales hanging along the side of whaling boats (4).
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Comprehensive Description

Description

  Common names: shark (English), tiburón (Espanol)
 
Carcharhinus brachyurus (Günther, 1870)


Narrowtooth shark,     Copper shark,     Bronze whaler shark


Body slender;  snout blunt, broad, rounded, its length 1.1-1.4 times the distance between nostrils; nasal orifices small and well separated; round eye; spiracle absent; upper front teeth narrow and hooked, with finely serrated points; lower front teeth narrow, high, straight; 5 short gill slits, last 2 over pectoral fin base; first dorsal moderately high (6.8-9.7% of TL), front edge straight, origin over or just behind rear edge of pectoral; second dorsal moderately high origin over anal origin; pectoral long, straight; usually no raised crest on back between dorsal fins; tail strongly asymmetrical, with well developed lower lobe, undulating ridge along dorsal surface of top lobe, and a ventral notch near tip of that lobe; notch on top of tail base.

Dark grey-brown above, belly whitish; a pale stripe along flank; tips of pelvics and tips and rear borders of pectorals dark to blackish.

Size: 325 cm.

Habitat: inshore to offshore, continental, from surfline deeper.

Depth: 0-360 m.

Circumglobal; California to the Gulf of California and central Mexico, the Revillagigedos, Peru.
   
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Biology

A coastal and offshore shark (Ref. 9997) found along continental margins in most tropical and temperate seas. Occasionally enters large coastal bays and inshore areas (Ref. 6390). Occasionally found near the bottom (Ref. 6808). Migratory in the northern part of its range, moving northward in spring and summer and southward in autumn and winter (Ref. 244). Feeds on pelagic and bottom bony fishes, cephalopods, and small sharks and rays (Ref. 5578). Viviparous (Ref. 50449). Undoubtedly utilized for human consumption where it occurs (Ref. 244). Implicated in shark attacks on people (Ref. 9997).
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Distribution

Range Description

The range and biology of C. brachyurus is poorly known due to confusion with other large Carcharhinus species, particularly C. obscurus which often replaces it in subtropical waters (Garrick 1982, Compagno 1984, Compagno et al. 1989). Although widely distributed in warm temperate and subtropical waters, populations of C. brachyurus are disjoint and there is probably little interchange between them. Verified records from tropical regions are infrequent and very patchy but include Equatorial Guinea and possibly the Gulf of Thailand (Garrick 1982, Compagno 1984, Vidthayanon 2002). C. brachyurus was also reported to be common in the Seychelles by Marshall (in Rose 1996), however, this requires confirmation given this species preference for temperate shelf habitats. No estimates of population size or biomass are available. Global population structure is unknown. Stock structure is not known for any fished population.

C. brachyurus is widespread in the Mediterranean but only sporadically reported possibly due to misidentification and lower abundance relative to other large sharks (Fergusson and Compagno 1995). C. brachyurus was the least abundant of the five pelagic sharks sampled in the northeast Atlantic and western Mediterranean by Muñoz-Chápuli (1984). The relationship between the Mediterranean and northeast Atlantic populations is unknown but it seems likely that pregnant females migrate from the Atlantic to breeding grounds off Morocco (Muñoz-Chápuli 1984). Stock structure in the Mediterranean is unknown. Despite being listed as common in US Atlantic shark landings by Rose (1996, pg. 26) C. brachyurus is absent from the western North Atlantic (Garrick 1982, Compagno 1984, Russell 1993, Castillo-Génez et al. 1998, J. Castro, pers. comm., L. Natanson, pers. comm., M. Grace, pers. comm.). In the southwest Atlantic C. brachyurus is relatively common off northern Argentina during summer, and is the most abundant species of Carcharhinus in Agentina (Chiaramonte 1998a, b). It is also common off Namibia and the west coast of South Africa (Compagno et al. 1989). In the Indian Ocean it is common off Eastern Cape, South Africa ranging north to Richard?s Bay, Natal although it is rare north of Durban (Compagno et al. 1989, Cliff and Dudley 1992).

Range and population size is poorly known in the eastern Pacific. Although Compagno (1984) speculated that it may occur in Chile there are no documented records or specimens of C. brachyurus in Museum collections there (I. Kong, pers. comm). Philippi (1887) described two species, Hypoprion isodus and H. heterodus from Chile on the basis of two dried jaws (Garrick 1982). Garrick (1982) considered both to be species dubia placing them in Carcharhinus. The upper teeth in both jaws are too broad and the tooth counts are too low for either to be brachyurus (Garrick 1982). Garrick (1982) considered H. heterodus was likely to be C. obscurus or galapagensis. Pequeño (1989) also considered it likely H. heterodus corresponds to C. obscurus (I. Kong, pers. comm). Despite the lack of records and specimens it seems likely that C. brachyurus at least occasionally reaches northern Chilean waters from Peru. Little is known of its occurrence in Peru other than the juvenile specimens reported by Garrick (1982). C. brachyurus appears to be uncommon or rare in Mexico (Gulf of California and Baja California) but confusion with other Carcharhinus species could be a problem (O. Sosa, pers. com., L. Castillo, pers. comm.). Although very small juveniles have been collected from a number of locations in southern California suggesting it may breed there, C. brachyurus is considered to be a rare visitor to the west coast of the US (Garrick 1982, R. Lea, pers. comm., D. Ebert, pers. comm., G. Cailliet, pers. comm.). There are no records of C. brachyurus north of Point Conception (R. Lea, pers. comm), although based on what is known of its ecology in the Southern Hemisphere it could be expected to be common as far north as Monterey Bay (D. Ebert, pers. comm). This apparent rarity does not appear to be due to confusion with other species of Carcharhinus as the genus itself is rare in California (R. Lea, pers. comm). It is worth noting here that although Garrick (1982) synonymised C. lamiella with brachyurus the characters referred to in the description of lamiella were those diagnostic of C. obscurus. Consequently most records of lamiella from California are not referable to C. brachyurus (Garrick 1982). The populations in the northeast and southeast Pacific appear to be disjunct (Compagno 1984).

In Australian waters C. brachyurus is infrequently recorded north of Sydney or Perth, being most abundant between Albany (Western Australia) and Bass Strait (Last and Stevens 1994, R. McAuley, pers. comm., C. Simpfendorfer, pers. comm., J. Stevens, pers. comm.). It is the commonest Carcharhinus species in South Australia and Victoria (Cappo 1992). C. brachyurus has not been recorded from Lord Howe and Norfolk Islands (Last and Stevens 1994). In New Zealand waters C. brachyurus is common around the northern half of North Island, including Three Kings Islands, Middlesex Bank and Three Kings Rise, ranging south to Cook Strait in summer (Illingworth 1961, Garrick 1982, Francis 2001). Pregnant females and pups have been recorded as far south as Waimea Inlet, Nelson (about 41°S, C.D. unpublished data). C. brachyurus has not been recorded from the Kermadec Islands or the islands of the tropical southwest Pacific (Garrick 1982, Compagno 1984, Last and Stevens 1994, Cox and Francis 1997).
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Zoogeography

See Map (including site records) of Distribution in the Tropical Eastern Pacific 
 
Global Endemism: All species, TEP non-endemic, Circumtropical ( Indian + Pacific + Atlantic Oceans), "Transpacific" (East + Central &/or West Pacific), West + East Pacific (but not Central), East Pacific + Atlantic (East +/or West), East Pacific + East (not West) Atlantic

Regional Endemism: All species, Eastern Pacific non-endemic, Tropical Eastern Pacific (TEP) non-endemic, Temperate Eastern Pacific, primarily, California + Peruvian provinces, primarily, Continent + Island (s), Continent, Island (s)

Residency: Resident

Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California), Northern Subtropical (Cortez Province + Sinaloan Gap), Northern Tropical (Mexican Province to Nicaragua + Revillagigedos), South Temperate (Peruvian Province ), Antitropical (North and South temperate)
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Western Atlantic: Mexico, Gulf of Mexico, Brazil to Argentina. Eastern Atlantic: off France southward and around the coast of southern Africa to central Natal, South Africa (Ref. 5578), including the Mediterranean. Possibly two separate populations in southern Africa (Ref. 3209). Western Pacific: Japan to New Zealand. Eastern Pacific: southern California, USA to the Gulf of California in Mexico and Peru.
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Nearly circumblobal.
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Range

Occurs in most warm temperate waters in the Indo-Pacific, Atlantic and Mediterranean (5). The East Asia subpopulation has been recorded from the coastal waters off Japan, China, North and South Korea and southern Siberia (1).
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Depth

Depth Range (m): 0 (S) - 360 (S)
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0
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Size

Length max (cm): 325.0 (S)
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Size

Maximum size: 3250 mm TL
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Max. size

325 cm TL (male/unsexed; (Ref. 2334)); max. published weight: 304.6 kg (Ref. 40637); max. reported age: 30 years (Ref. 3209)
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Diagnostic Description

Description

Found along continental margins in most tropical and temperate seas. Feeds on other sharks, rays, bony fishes, and cephalopods. Viviparous, with a yolk-sac placenta, and has litters of 13 to 20 pups, 60 to 70 cm at birth (Ref. 2334). Migratory in the northern part of its range, moving northward in spring and summer and southward in autumn and winter. Utilized for human consumption. Considered a dangerous species.
  • Anon. (1996). FishBase 96 [CD-ROM]. ICLARM: Los Baños, Philippines. 1 cd-rom pp.
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A large shark to with a bluntly pointed, broad snout, narrow, bent cusps on the upper teeth, and with no interdorsal ridge (Ref. 5578). Grey to bronzy in color, white below (Ref. 5578); fins mostly plain except for dusky tips on pelvic fins, as well as dusky to black tips and rear edges on pectoral fins (Ref. 9997).
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Type Information

Syntype for Carcharhinus brachyurus
Catalog Number: USNM 114946
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Year Collected: 1938
Locality: New South Wales, Off Sydney, New South Wales, Australia, Pacific
  • Syntype: Stead, D. G. 1938. The Australian Naturalist. 10 (3): 102.
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Type for Carcharhinus brachyurus
Catalog Number: USNM 27366
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): D. Jordan
Year Collected: 1880
Locality: San Diego, California, San Diego County, California, United States, Pacific
  • Type: Jordan, D. S. & Gilbert, C. H. 1882. Proceedings of the United States National Museum. 5 (269): 110.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Carcharhinus brachyurus is an essentially warm temperate and subtropical species (Garrick 1982, Compagno 1984, Muñoz-Chápuli 1984, Smale 1991, Cappo 1992, Cliff and Dudley 1992, Chiaramonte 1998). It is a widespread but patchily distributed coastal and shelf species, occasionally reported from oceanic areas close to the continental shelf (Amorim et al. 1998, Marín et al. 1998, Bagley et al. 2000). It readily enters shallow water, and individuals and aggregations are often sighted in shallow bays, the surf zone and in harbour channels during summer (Ayling and Cox 1982, Cappo 1992, Last and Stevens 1994). It also occurs in brackish or freshwater in the lower reaches of large rivers and estuarine bays (Last 2002). Maximum reported depth is 100 m but it is likely to range deeper (Compagno 1984, Smale 1991, Last and Stevens 1994). Diet includes a wide variety of bottom-living and pelagic cephalopods and fishes including squid (Loligo spp.), cuttlefish, octopus, spiny dogfish (Squalus spp.), stingrays, electric rays, sawfish, gurnard, flatfish, hake, catfish, ling, jacks, kahawai/Australian salmon, mullet, sea bream, sardines and anchovy (Illingworth 1961, Compagno 1984, Comapgno et al. 1989, Smale 1991, Cliff and Dudley 1992, Last and Stevens 1994, Francis 2001). Juveniles also feed on jellyfishes (Scyphozoa) and benthic crustacea (Callianasa spp. and Penaeid shrimps) (Smale 1991). Other elasmobranchs are taken with greatest frequency by sharks over 2 m total length (Smale 1991, Cliff and Dudley 1992).

Juvenile and adult C. brachyurus segregate by size and sex (Muñoz-Chápuli 1984, Smale 1991, Cliff and Dudley 1992, Chiaramonte 1998). Juveniles occur in shallow water (less than 30 m depth) year round, whereas adults are most abundant inshore during spring and summer. Adults and sub-adults are found over the shelf and around offshore islands and banks throughout the year. The movement of adult females inshore in spring is related to breeding. Nursery areas tend to be large and ill defined but include shallow banks, large shallow bays, inlets and harbours as well as the open coast (Muñoz-Chápuli 1984, Smale 1991, Cappo 1992, Chiaramonte 1998b, Fergusson and Compagno 1995). These areas also tend to be nurseries for other common coastal sharks such as Smoothhound (Mustelus spp.), School Shark (Galeorhinus galeus) and Smooth Hammerhead (Sphyrna zygaena). In New Zealand pregnant females and neonates have been reported as far south as Waimea Inlet (41°20'S) on the west coast and Hawke Bay (40°S) on the east coast (Garrick 1982, C.D. unpublished data). In Australia neonates and small juveniles (less than 1 m total length) have been reported from Albany (Western Australia), Port Lincoln, the upper Gulf St. Vincent and Robe (South Australia), and Port Phillip Bay (Victoria) (Cappo 1992, R. McAuley pers. comm., T. Walker pers. comm., I.G. pers. obs). In South Africa the waters of the Eastern Cape are considered to be the main nursery area for this species (Smale 1991, Cliff and Dudley 1992). Elsewhere neonates and small juveniles have been recorded from: Rhodes, Nice and the banks off Al Hoceima (West Alboran Basin) in the Mediterranean (Garrick 1982, Muñoz-Chápuli 1984, Fergusson and Compagno 1995); Rio de Oro, Pulpito Bay, northwest Africa (Garrick 1982); Rio de Janeiro, Brazil (Garrick 1982); Bahia Blanca and Bahia San Blas, Distrito Bonaerense, Argentina (Chiaramonte 1998b); Paita and Guanape Cove, Peru (Garrick 1982); Bahia Sebastian Vizcaino, Baja California (Garrick 1982); San Diego Bay and Oceanside, California (Garrick 1982); near Niigata, Sea of Japan (Garrick 1982).

Segregation also occurs along latitudinal gradients (Muñoz-Chápuli 1984, Smale 1991, Cliff and Dudley 1992). Adult males are present in subtropical regions throughout the year, whereas females and immature C. brachyurus migrate into these regions during winter. Most adult females return to temperate regions to breed in the spring. The males also appear to migrate to higher latitudes in late winter-spring presumably to mate (Cliff and Dudley 1992). Mating probably occurs offshore as the females disperse from the nursery areas. Post-partum females bearing unhealed mating scars have been caught over the shelf (about 100 m depth) in early February off Hawke Bay, New Zealand (C.D. pers. obs). C. brachyurus inhabiting temperate areas also range into higher latitudes during the summer (Ayling and Cox 1982, Compagno 1984, Compagno et al. 1989, Cappo 1992, Last and Stevens 1994, Chiaramonte 1998b). These latitudinal movements may be in response to changes in water temperature or prey migrations (Compagno 1984, Comapgno et al. 1989, Cliff and Dudley 1992, Chiaramonte 1998b). In South Africa female C. brachyurus appear to follow the sardine run from the Eastern Cape to Natal during winter (Compagno et al. 1989, Cliff and Dudley 1992). The mean distance travelled by tagged C. brachyurus in South Africa is 163 km during 162 days at liberty, the maximum distance travelled was 1,320 km (Cliff and Dudley 1992). In South Australia tagged adults have been resighted at their tagging location after a year at liberty suggesting this species, like other Carcharhinids, is philopatric (I.G. pers. obs). Movement between New Zealand and Australia, or other regional populations has not been documented.

C. brachyurus occur singly and in loose schools sometimes numbering hundreds of individuals (Smale 1991, Cappo 1992, Cliff and Dudley 1992, C.D. unpublished data). In New Zealand and Australia these aggregations are most conspicuous in shallow water near shore during spring and summer, and in South Africa during the winter sardine run. Divers and sport fishers also report aggregations of C. brachyurus around offshore islands and banks off northern New Zealand during winter. Aggregations of large sharks reported in the surf zone near the entrances to harbours in northern New Zealand during spring may be related to breeding however at other times schooling may be a response to a local abundance of prey (Compagno et al. 1989, Cappo 1992).

Reproductive periodicity is probably biennial like most other large Carcharhinids (Castro et al. 1999). In the Southern Hemisphere parturition probably occurs from June to January, with a peak in October and November (Smale 1991, Cliff and Dudley 1992, Chiaramonte 1998b). Reproduction is viviparous, with a yolk sac placenta. Litters range from 7 to 24, with an average of 15 reported from South Africa (Garrick 1982, Smale 199, Cliff and Dudley 1992, Chiaramonte 1998b). Size at birth is about 60 cm total length (range 55-67 cm total length) (Garrick 1982, Smale 1991, Cliff and Dudley 1992). Cliff and Dudley (1992) estimated gestation lasts about 12 months. However their data show two embryonic size classes are present in the January and June-July samples, and a better description of embryonic growth is obtained if a 15 to 21 month gestation period is assumed (r² = 0.798 cf. 0.628). Males mature between 206 and 235 cm total length, and females from 227 to 244 cm total length. Age at maturity in South Africa is estimated to be 13 to 19 years for males, and 19-20 years for females (Walter and Ebert 1991). Maximum size of C. brachyurus is at least 295 cm total length and it is reported to reach 350 cm total length (Ayling and Cox 1982, Compagno 1984, Last and Stevens 1994). Maximum age is unknown. Productivity is estimated to be low to very low, with a minimum population doubling time of more than 14 yrs (K=0.04) (Froese and Pauly 2002, Fish Base).

Systems
  • Freshwater
  • Marine
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Environment

reef-associated; oceanodromous (Ref. 51243); brackish; marine; depth range 0 - 360 m (Ref. 58018)
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Depth range based on 39 specimens in 1 taxon.
Water temperature and chemistry ranges based on 15 samples.

Environmental ranges
  Depth range (m): 23 - 536
  Temperature range (°C): 6.409 - 20.525
  Nitrate (umol/L): 0.276 - 21.897
  Salinity (PPS): 34.440 - 35.993
  Oxygen (ml/l): 4.364 - 5.304
  Phosphate (umol/l): 0.134 - 1.821
  Silicate (umol/l): 1.128 - 18.665

Graphical representation

Depth range (m): 23 - 536

Temperature range (°C): 6.409 - 20.525

Nitrate (umol/L): 0.276 - 21.897

Salinity (PPS): 34.440 - 35.993

Oxygen (ml/l): 4.364 - 5.304

Phosphate (umol/l): 0.134 - 1.821

Silicate (umol/l): 1.128 - 18.665
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Depth: 0 - 100m.
Recorded at 100 meters.

Habitat: pelagic. Copper shark.  Gunther, 1870 Attains 2.9 Metres. Litter of 13 - 20 pups. Has been blamed for several attacks on man. Common from Namibia to Port Elizabeth.
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The bronze whaler can be found from the surfline to depths of at least 100 metres (3) (5).
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Salinity: Marine, Marine Only

Inshore/Offshore: Offshore, In & Offshore, Inshore

Water Column Position: Surface, Near Surface, Mid Water, Near Bottom, Water column only

Habitat: Water column

FishBase Habitat: Pelagic
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Migration

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.
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Trophic Strategy

These sharks enter estuaries occasionally. Found from surf zone to at least 100 m (Refs. 6390, 6871). Occurs on the continental shelf (Ref. 75154).
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Feeding

Feeding Group: Carnivore

Diet: octopus/squid/cuttlefish, bony fishes
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Life History and Behavior

Life Cycle

Viviparous, with a yolk-sac placenta. Litter contains 7 to 20 pups (Ref. 6871, 6390). Young born at 59 - 70 cm TL (Ref. 6390). Pupping may occur at any time of the year but there is a peak in births in summer (Ref. 6390). Distinct pairing with embrace (Ref. 205).
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Life Expectancy

Lifespan, longevity, and ageing

Maximum longevity: 34.5 years (wild)
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Reproduction

Egg Type: Live birth, No pelagic larva
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Carcharhinus brachyurus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 5 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

CCTTTACCTGATTTTTGGTGCATGAGCAGGTATAGTTGGAACAGCCCTAAGTCTCCTAATTCGAGCTGAACTTGGGCAACCTGGATCACTTTTAGGGGATGATCAGATCTACAATGTAATCGTAACCGCCCACGCTTTTGTAATAATCTTTTTCATGGTTATACCAATTATAATTGGTGGTTTCGGAAATTGACTAGTTCCTTTAATAATTGGTGCACCAGATATAGCCTTCCCACGAATAAATAACATAAGTTTCTGACTCCTTCCACCATCATTTCTTCTTCTCCTCGCCTCTGCTGGAGTAGAAGCTGGAGCAGGTACTGGTTGAACAGTCTACCCTCCATTAGCTAGCAACCTAGCACATGCTGGACCATCTGTTGATTTAGCTATTTTCTCTCTTCACTTAGCCGGTGTTTCATCAATTTTAGCTTCAATTAATTTTATCACAACTATTATTAACATAAAACCACCAGCCATTTCCCAATATCAAACACCATTATTTGTTTGATCTATTCTTGTAACCACTATTCTTCTTCTCCTCTCACTTCCAGTCCTTGCAGCAGGGATTACAATATTACTTACAGATCGTAACCTTAATACTACATTCTTTGACCCTGCAGGCGGAGGAGACCCAATCCTTTATCAACATTTA
-- end --

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Statistics of barcoding coverage: Carcharhinus brachyurus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 9
Specimens with Barcodes: 25
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
NT
Near Threatened

Red List Criteria

Version
3.1

Year Assessed
2003

Assessor/s
Duffy, C. & Gordon, I. (SSG Australia & Oceania Regional Workshop, March 2003)

Reviewer/s
Fowler, S., Lea, R., Ebert, D, Musick, J.A. & Cavanagh, R.D. (Shark Red List Authority)

Contributor/s

Justification
Carcharhinus brachyurus is a large coastal shark with low productivity. Although widespread, regional populations appear to be discrete, and movement of individuals between them is thought infrequent or absent, and it does not appear to be naturally abundant anywhere. C. brachyurus is assessed as Vulnerable in East Asia due to intensive fisheries and the apparent widespread collapse of fisheries for large coastal sharks. Coastal multispecies fisheries in the region are likely to continue to depress the population by taking pregnant females and juveniles. Coastal nursery areas in this region are also at risk from development and pollution.

Catches appear to be stable in Australia. In New Zealand, although there may have been some reduction in population size due to fishing, C. brachyurus is apparently still common throughout its range. Management of this species in New Zealand, Australia and South Africa is simplified by having most, if not all of the population resident within each nation?s EEZ, and the species is assessed as Least Concern in these regions. However, it is assessed as Data Deficient in the East Pacific, where there is no information and it appears to be uncommon or rare.

Throughout its range, it is known to be exploited by fisheries, but landings are grouped together with other Carcharhinus species, meaning any population declines are likely to go unnoticed, and its coastal nursery areas are potentially vulnerable to development and pollution. This, together with life history characteristics that make it especially vulnerable to overfishing has led to the global assessment of C. brachyurus as Near Threatened. The situation must be monitored as this species could soon qualify for a threatened category, on the basis of population declines due to fisheries exploitation, in other areas.
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Status

Classified as Near Threatened (NT) on the IUCN Red List (1). The East Asia subpopulation is classified as Vulnerable (VU) on the IUCN Red List (1).
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IUCN Red List: Listed, Near threatened

CITES: Not listed
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Population

Population Trend
Unknown
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Threats

Major Threats
The life-history of this large Carcharhinid makes it vulnerable to over fishing by directed fisheries and as bycatch in fisheries targeted at more productive species (Walker 1998, Castro et al. 1999, Vidthayanon 2002). C. brachyurus is mainly taken as bycatch in gill net and bottom longline fisheries for bony fishes and other sharks, particularly Mustelus spp. and Galeorhinus galeus (Compagno et al. 1989, Cappo 1992, Bentley in Rose 1996, Chiaramonte 1998a, b). It is also taken by bottom trawl and pelagic longline but only forms a minor component of the catch in these fisheries (Compagno et al. 1989, Parry-Jones 1996, Amorim et al. 1998, Marín et al. 1998, Bagley et al. 2000).

C. brachyurus is fished commercially in New Zealand (Francis 1998, Bagley et al. 2000, Ministry of Fisheries catch effort data), Australia (Cappo 1992), South Africa (Compagno et al.1989), Brazil (Amorim et al. 1998), Uruguay (Marín et al. 1998), Argentina (Chiaramonte 1998a, b), Mexico (Appelgate et al. 1993) and China (Parry-Jones 1996). C. brachyurus was not reported in trade from any of its Mediterranean range states by Rose (1996) but it is taken in net fisheries here and is usually lumped with other Carcharhinids (e.g., C. plumbeus) when landed (Fergusson and Compagno 1995). Little data is available for these fisheries. In Western Australia the "bronze whaler fishery" actually targets juvenile dusky shark (C. obscurus) (Heald 1987, Simpfendorfer 2001). C. brachyurus only constitutes about 3% of total reported landings in this fishery (R. McAuley pers. comm.). Carcharhinus spp. are also taken as bycatch in the Southern Shark Fishery (Victoria, Tasmania, South Australia). Between 1996-2001 mean annual landed catch of Carcharhinus spp. in this fishery was 71.5 tonnes (range 44-106 tonnes) (T. Walker pers. comm). The bulk of this (97-100%) was landed in South Australia, where landings increased from less than 20 tonnes a year in the early 1980s to 60-70 tonnes a year between 1988 and 1990 (Stevens in Castro et al. 1999). During the 1990s the landed catch has remained stable at around 70 tonnes a year, although a maximum of 105 tonnes was landed in 1999 (T. Walker pers. com.). The species composition of the bronze whaler catch in South Australia is unknown but is likely to be predominately C. brachyurus (Cappo 1992). In New Zealand reported commercial landings increased from 10 tonnes in 1989/90 to about 48 tonnes in 1995/96. Since then landings have declined steadily to about 20 tonnes in the 2001/02 fishing year (Ministry of Fisheries catch effort data). Most of the catch is taken by set net in the Hauraki Gulf and Firth of Thames. Reported landings from this area have been declining since 1992/93. No CPUE analysis of this fishery has been performed so it is uncertain if the decline in landings represents a decline in abundance or a change in fishing practice.

Although no fishery data is available for C. brachyurus in East Asia (i.e., Sea of Japan, Yellow Sea, East China Sea) directed shark fisheries have operated in the region since at least the 1950s, and sharks are a component of multi-species fisheries for more highly valued species such as tuna and swordfish (Parry-Jones and others in Phipps 1996). All directed fisheries for large coastal sharks in this region appear to have ceased during the 1970s due to declining catches and a shift in effort into offshore fisheries for tuna and salmon (Parry-Jones, and Kiyono in Phipps 1996). Parry-Jones (1996) observed that shark landings from coastal fisheries in China consisted mainly of small immature sharks (i.e., 90% <100 cm total length and 1 kg weight). The only C. brachyurus observed in markets during that survey was a juvenile weighing 5.5 kg in Fujian Province. Fishers from Fujian Province reported that large sharks were relatively common during the 1960s but are seldom caught now (Parry-Jones 1996). Fishing vessels from China, Taiwan, Hong Kong, Japan, South Korea, the Philippines and Viet Nam all operate in the South China Sea, East China Sea and Yellow Sea (Parry-Jones 1996). C. brachyurus is not reported to be an important component of Taiwan?s shark fishery, either within Taiwanese waters, its distant-water shark fishing areas in Papua New Guinea, Indonesia and Mozambique, or its tuna longline and trawler fleets. The latter fishes waters of the South China Sea, Yellow Sea, East China Sea, India and northwest Africa (Chen et al. 2002).

In Argentina the main commercial fishery is located at Necochea. Reported annual landings range from 0 to 336 sharks (Chiaramonte 1998a). Chiaramonte (1998a) reported only two vessels targeted C. brachyurus, and observed that catches indicated this species was not sufficiently abundant to support a directed fishery should the school shark (G. galeus) stock collapse. In Chile directed shark fisheries are confined to the northern part of the country where artisanal fishers target shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca) and may occasionally take Carcharhinus spp. (I. Kong pers. com.). Little information is available on the elasmobranch fisheries in Peru other than landings are dominated by smoothhounds (Mustelus spp) and batoids (Bonfil 1994). In 1990/91 landings crashed from over 25,000 tonnes to about 5,000 tonnes p.a. The reason for this crash is unknown and may not reflect a collapse of the fishery (Bonfil 1994). Mexican shark fisheries are the largest in America and the Pacific coast contributes about 60% of total landings (Bonfil 1994). There is also a significant bycatch of elasmobranchs in large scale trawl fisheries in the Mexican Pacific (Bonfil 1994). The Gulf of California represents one of the major fishing grounds in the Pacific and supports directed fisheries for Carcharhinus spp. (C. altimus, C. brachyurus, C. falciformis, C. leucus, C. limbatus, C. obscurus, C. porosus) (Appelgate et al. 1993, Bonfil 1994). Although information on stock size and species specific fishing mortality was limited or non-existent Bonfil (1994) considered it likely, given the level of exploitation that many shark stocks in the Gulf of California were close to their maximum sustainable yield or overfished. Neither Applegate et al. (1993) or Bonfil (1994) listed C. brachyurus as being heavily fished. However, as it is vulnerable to the same types of gear and may be naturally less abundant than those Carcharhinus spp. that dominate the landings, the effects of fishing on C. brachyurus may be more serious than its representation in the catch suggests. C. brachyurus and other Carcharhinus spp. are rare in California and do not support any directed fisheries (Bonfil 1994, Hanson 1999, R. Lea pers. comm., D. Ebert pers. comm., G. Cailliet pers. comm.).

Sport fisheries taking Carcharhinus spp. occur in New Zealand, Australia, South Africa, Argentina, Mexico and California (Stevens 1984, Compagno et al. 1989, Cappo 1992, Pepperell 1992, Appelgate et al. 1993, Francis 1998, Chiaramonte 1998a, b). In New Zealand C. brachyurus is the most commonly landed Carcharhinus species. It is only infrequently taken by anglers targeting marlin and swordfish off the northeast North Island. Most of these fish are unwanted and are released. However there is a small summer boat and shore-based sport fishery for C. brachyurus centered on the large harbours in the northern North Island. Most of the sharks taken in this fishery are pregnant and post-partum females and are tagged and released. A small number are retained and landed during fishing competitions. C. brachyurus are also occasionally taken by bow-hunters in some North Island harbours, and there are incidental catches of juveniles and adults in recreational gill net fisheries for rig (Mustelus lenticulatus), mullet, snapper and flatfish. The size of this bycatch is unknown but is probably minor. C. brachyurus is a minor component of sport fishing catches in southern New South Wales between Port Stephens and Narooma but is likely to dominate "bronze whaler" catches in Victoria and South Australia (Stevens 1984, Cappo 1992). No information on these fisheries was available at the time of writing. In South Africa this species is regularly taken by shore-based fishers in the Eastern Cape. These fishers take mainly neonates and juveniles less than 2 m total length (Smale 1991). There is also a land-based tag and release fishery for adult C. brachyurus in Nambia (S. Fowler pers. comm.).

C. brachyurus is commonly taken in protective shark control programs off Natal, South Africa and presumably Australia (New South Wales), although catches of Carcharhinus spp. are not identified to species in Australia (Cliff and Dudley 1992, Reid and Krogh 1992, Dudley 1997, Dudley et al. 1998). The mean annual catch in the Natal shark nets between 1978 and 1990 was 138 (range 9 to 421). Large annual fluctuations in catch meant no trend was evident over that period (Cliff and Dudley 1992). C. brachyurus is also killed as a pest species in and around fish farms, notably southern bluefin tuna pens in South Australia (I.G. pers. obs). The shallow coastal nursery areas of C. brachyurus are also potentially vulnerable to habitat loss and pollution arising from coastal development. The effects of this are likely to be greatest in parts of the Mediterranean Sea and East Asia. Expansion of marine aquaculture in New Zealand also potentially threatens nursery areas of C. brachyurus.

Castro et al. (1999) listed this species as Category 3 (i.e., a species that is exploited by directed fisheries or bycatch, and has a limited reproductive potential, and/or life history characteristics that makes it especially vulnerable to over fishing). Vidthayanon (2002) listed it as vulnerable in Thailand.
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Near Threatened (NT)
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There is little information regarding the extent to which the bronze whaler is utilized, but it is undoubtedly caught for food, by sports anglers and taken as by-catch in a number of areas (1) (3) (5). As the bronze whaler is exceptionally slow to reproduce, it is particularly vulnerable to over fishing (3) (5). The East Asia subpopulation is the target of commercial fishing in China and contributes to the catch of shark fisheries in East Asia since the 1950s. However, fisheries for large coastal sharks in the region appear to have ceased during the 1970s due to declining catches. This apparent collapse of coastal shark fisheries indicates a decline in the East Asia subpopulation, and multi-species fisheries in the region are likely to continue to impact the population (1). The bronze whaler may also be threatened by degradation of their inshore nursery habitats, which are vulnerable to the effects of human development and pollution (1) (5).
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Management

Conservation Actions

Conservation Actions
Australia:
A prohibition on taking school and gummy sharks in shark nursery areas in Tasmania, and bans on gillnetting in some of these, may indirectly benefit some C. brachyurus but most of these areas are outside the main part of the species range (Williams and Schaap 1992, Last and Stevens 1994). Victorian coastal waters out to three nautical miles are almost completely closed to commercial shark fishing (Stevens 2002).

New Zealand:
C. brachyurus may not be target fished in Quota Management Areas 1, 3, 4, 5, 6, 9. Management measures that are likely to indirectly benefit this species include closure of most harbours and semi-enclosed bays in northern New Zealand to trawling and Danish seining, and a permanent ban on gill netting out to five nautical miles from shore off the northwest North Island (Fisheries statistical areas 41 and 42) to protect endangered North Island Hector?s dolphin.
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Conservation

There are few conservation measures in place aimed specifically at the bronze whaler. In Australia and New Zealand, measures aimed at other species are likely to also be beneficial to the bronze whaler, for example, bans on taking school and gummy sharks from nursery areas in Tasmania, and a ban on gill netting out to five nautical miles from shore off the northwest North Island, New Zealand (1). Specific conservation actions may be required to conserve this magnificent ocean predator.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: minor commercial; gamefish: yes; price category: high; price reliability: reliable: based on ex-vessel price for this species
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Wikipedia

Copper shark

The copper shark, bronze whaler, or narrowtooth shark (Carcharhinus brachyurus) is a species of requiem shark, family Carcharhinidae, and the only member of its genus found mostly at temperate latitudes. It is distributed in a number of separate populations in the northeastern and southwestern Atlantic, off southern Africa, in the northwestern and eastern Pacific, and around Australia and New Zealand, with scattered reports from equatorial regions. This species can be found from brackish rivers and estuaries, to shallow bays and harbors, to offshore waters 100 m (330 ft) deep or more. Females are found apart from males for most of the year, and conduct seasonal migrations. A large species reaching 3.3 m (11 ft) long, the copper shark is difficult to distinguish from other large requiem sharks. It is characterized by its narrow, hook-shaped upper teeth, lack of a prominent ridge between the dorsal fins, and plain bronze coloration.

Feeding mainly on cephalopods, bony fishes, and other cartilaginous fishes, the copper shark is a fast-swimming predator that often hunts in large groups, utilizing their numbers to their advantage. Off South Africa, this species associates closely with the annual sardine run, involving millions of southern African pilchard (Sardinops sagax). Like other requiem sharks, it is viviparous, with the developing embryos mainly nourished through a placental connection formed from the depleted yolk sac. Females bear litters of 7 to 24 pups every other year in coastal nursery areas, after a gestation period of 12 or perhaps as long as 21 months. It is extremely slow-growing, with males and females not reaching maturity until 13–19 and 19–20 years of age respectively.

This species is valued by commercial and recreational fisheries throughout its range, and utilized as food. The species population size is unknown,[3] but the ICUN's Red List assesses the species as Near Threatened because it is very susceptible to population depletion due to its low growth and reproductive rates and because its numbers are believed to have declined in some areas.

Copper sharks only attack humans infrequently, but the species places sixth in the number of unprovoked attacks on people.[4]

Taxonomy[edit]

Because of its very patchy range, the copper shark has been scientifically described several times from different locales. The earliest valid description is presently considered to be British zoologist Albert Günther's account of Carcharias brachyurus in the 1870 eighth volume of Catalogue of the fishes in the British Museum.[5] The earliest name was once thought to be Auguste Duméril's 1865 Carcharias remotus, until it was found that the type specimen associated with that name is actually a blacknose shark (C. acronotus). Thus, this shark was often referred to as C. remotus in older literature.[6] An even earlier name, Richard Owen's 1853 Galeolamna greyi, is of questionable taxonomic status as it was based solely on a set of now-destroyed jaws that may or may not have belonged to a copper shark. Modern authors have assigned this species to the genus Carcharhinus.[7]

The specific epithet brachyurus is derived from the Greek brachys ("short") and oura ("tail").[6] The name "whaler" originated in the 19th century, applied by the crews of whaling vessels in the Pacific who saw large sharks of various species congregating around harpooned whale carcasses.[8] This species may also be referred to as black-tipped whaler, cocktail shark or cocktail whaler, or New Zealand whaler, as well as by the shortened "bronze", "bronzie", or "cocktail".[1][9] Günther originally referred to four syntypes: a stuffed specimen from Antarctica and another from New Zealand, which have since been lost, and two fetuses from Australia that were later discovered to be bull sharks (C. leucas).[5][7] In the interests of taxonomic stability, in 1982 Jack Garrick designated a 2.4 m (7.9 ft) long female caught off Whanganui, New Zealand as a new type specimen.[10]

Phylogeny and evolution[edit]

The first efforts to determine the evolutionary relationships of the copper shark were based on morphology and returned inconclusive results: in 1982 Jack Garrick placed it by itself as a grouping within Carcharhinus, while in 1988 Leonard Compagno placed it in an informal "transitional group" that also contained the blacknose shark (C. acronotus), the blacktip reef shark (C. melanopterus), the nervous shark (C. cautus), the silky shark (C. falciformis), and the night shark (C. signatus).[10][11] Gavin Naylor's 1992 allozyme study concluded that the closest relative of the copper shark is the spinner shark (C. brevipinna), but could not resolve their wider relationships with the rest of the genus.[12] Fossilized teeth from the copper shark have been recovered from the Pungo River in North Carolina, dating to the Miocene (23–5.3 Ma),[13] from Tuscany, dating to the Pliocene (5.3–2.6 Ma),[14] and from Costa Mesa in California, dating to the Late Pleistocene (126,000–12,000 years ago).[15]

Distribution and habitat[edit]

The copper shark is the only member of its genus largely found in temperate rather than tropical waters, in temperatures above 12 °C (54 °F).[10] It is widely distributed but as disjunct regional populations with little to no interchange between them. In the Atlantic, this shark occurs from the Mediterranean Sea to Morocco and the Canary Islands, off Argentina, and off Namibia and South Africa (where there may be two separate populations),[16] with infrequent records from Mauritania, the Gulf of Guinea, and possibly the Gulf of Mexico. In the Indo-Pacific, it is found from the East China Sea to Japan (excluding Hokkaido) and southern Russia, off southern Australia (mostly between Sydney and Perth but occasionally further north), and around New Zealand but not as far as the Kermadec Islands; there are also unconfirmed reports from the Seychelles and the Gulf of Thailand. In the eastern Pacific, it occurs from northern Chile to Peru, and from Mexico to Point Conception, California, including the Gulf of California. The copper shark is common off parts of Argentina, South Africa, Australia, and New Zealand, and rare elsewhere; in many areas its range is ill-defined because of confusion with other species.[1][7]

Copper sharks can be found from the surf zone to slightly beyond the continental shelf in the open ocean, diving to depths of 100 m (330 ft) or more. This species commonly enters very shallow habitats, including bays, shoals, and harbors, and also inhabits rocky areas and offshore islands.[1][17] It is tolerant of low and changing salinities, and has been reported from estuaries and the lower reaches of large rivers. Juveniles inhabit inshore waters less than 30 m (98 ft) deep throughout the year, while adults tend to be found further offshore and regularly approach the coast only in spring and summer, when large aggregations can be readily observed in shallow water.[1]

Populations of copper sharks in both hemispheres perform seasonal migrations, in response to temperature changes, reproductive events, and/or prey availability; the movement patterns differ with sex and age.[1][6] Adult females and juveniles spend winter in the subtropics and generally shift to higher latitudes as spring nears, with pregnant females also moving towards the coast to give birth in inshore nursery areas. Adult males remain in the subtropics for most of the year, except in late winter or spring when they also move into higher latitudes, in time to encounter and mate with post-partum females dispersing from the nurseries. During migrations, individual sharks have been recorded traveling up to 1,320 km (820 mi). It is philopatric, returning to the same areas year after year.[1]

Description[edit]

Side view of a shark with a slightly arched profile behind the head, a triangular first dorsal fin, and a large, asymmetrical tail
The copper shark can be difficult to distinguish from other large Carcharhinus species.

The copper shark has a slender, streamlined body with a slightly arched profile just behind the head.[7][18] The snout is rather long and pointed, with the nostrils preceded by low flaps of skin. The round, moderately large eyes are equipped with nictating membranes (protective third eyelids). The mouth has short, subtle furrows at the corners and contains 29–35 upper tooth rows and 29–33 lower tooth rows. The teeth are serrated with single narrow cusps; the upper teeth have a distinctive hooked shape and become more angled towards the corners of the jaw, while the lower teeth are upright.[7][19] The upper teeth of adult males are longer, narrower, more curved, and more finely serrated than those of adult females and juveniles.[6] The five pairs of gill slits are fairly long.[7]

The pectoral fins are large, pointed, and falcate (sickle-shaped). The first dorsal fin is tall, with a pointed apex and a concave trailing margin; its origin lies about even with the tips of the pectoral fins. The second dorsal fin is small and low, and positioned about opposite to the anal fin. There is usually no ridge between the dorsal fins. The caudal fin has a well-developed lower lobe and a deep ventral notch near the tip of the upper lobe. This species is bronze to olive-gray above with a metallic sheen and sometimes a pink cast, darkening towards the fin tips and margins but not conspicuously so; the color fades quickly to a dull gray-brown after death. The underside is white, which extends onto the flanks as a prominent band.[7][8][19] The copper shark is easily mistaken for other large Carcharhinus species, particularly the dusky shark (C. obscurus), but can be identified by its upper tooth shape, absent or weak interdorsal ridge, and lack of obvious fin markings.[20] It reportedly reaches a maximum length of 3.3 m (11 ft) and weight of 305 kilograms (672 lb).[9]

Biology and ecology[edit]

Fast and active, the copper shark may be encountered alone, in pairs, or in loosely organized schools containing up to hundreds of individuals. Some aggregations seem to form for reproductive purposes, while others form in response to concentrations of food.[1][17] This species may fall prey to larger sharks.[20] Known parasites of the copper shark include the tapeworms Cathetocephalus australis,[21] Dasyrhynchus pacificus and D. talismani,[22] Floriceps minacanthus,[23] Phoreiobothrium robertsoni,[24] and Pseudogrillotia spratti,[25] the leech Stibarobdella macrothela,[26] and the fluke Otodistomum veliporum.[20]

Feeding[edit]

A school of small, slim-bodied, silvery fish
Southern African pilchard are the most important prey species of copper sharks off South Africa.

The copper shark feeds more towards the bottom of the water column than the top, consuming cephalopods, including squid (Loligo spp.), cuttlefishes, and octopus; bony fishes, including gurnards, flatfishes, hakes, catfishes, jacks, Australian salmon, mullets, sea breams, smelts, tunas, sardines, and anchovies; and cartilaginous fishes, including dogfish sharks (Squalus spp.), stingrays, skates, electric rays, and sawfishes.[1][18] Cephalopods and cartilaginous fishes become relatively more important food for sharks over 2 m (6.6 ft) long.[27] Young sharks also consume scyphozoan jellyfish and crustaceans, including mud shrimps (Callianassa) and penaeid prawns.[1] It does not attack marine mammals, though has been known rarely to scavenge on dolphins that had succumbed to fishing nets.[28] The predominant prey of this species off South Africa is the southern African pilchard (Sardinops sagax), which comprise 69–95% of its diet. Every winter, schools of copper sharks follow the "run" of the pilchard from the Eastern Cape to KwaZulu-Natal.[29] The gathering of millions of forage fish attract a multitude of predators, including several species of sharks, of which copper sharks are the most numerous.[30]

Large numbers of copper sharks have been observed hunting together in a seemingly cooperative fashion. Small schooling fish are "herded" into a tight ball, whereupon each shark swims through in turn with its mouth open to feed. For groups of tuna and larger prey, the pursuing sharks may adopt a "wing" formation to force their quarry closer together, with each shark targeting a particular fish and attacking in turn.[6] In False Bay, South Africa, this species reportedly follows seine net fishing vessels.[31]

Life history[edit]

Like other members of its family, the copper shark is viviparous, in which the yolk sac of the developing embryo, once depleted, is converted into a placental connection through which the mother delivers nourishment.[1] Adult females have one functional ovary, on the right, and two functional uteruses.[32] The male bites the female as a prelude to mating. In the Southern Hemisphere, mating takes place from October to December (spring and early summer), when both sexes have migrated into offshore waters at higher latitudes. Birthing seems to occur from June to January, peaking in October and November.[1][29][32]

Female copper sharks make use of shallow inshore habitats, varying from stretches of open coast to more sheltered bays and inlets, as nurseries.[1][32] These nurseries provide abundant food and reduce the likelihood of predation by larger members of the species.[27] Known and suspected nursery areas occur off northern North Island from Waimea Inlet to Hawke Bay for New Zealand sharks, off Albany, in and around Gulf St Vincent, and in Port Phillip Bay for Australian sharks, off Niigata (Japan) for northwestern Pacific sharks, off the Eastern Cape for South Africa sharks, off Rhodes (Greece), Nice (France), and Al Hoceima (Morocco) for Mediterranean sharks, off Río de Oro (Western Sahara) for northwest African sharks, off Rio de Janeiro (Brazil) and Buenos Aires and Bahía Blanca (Argentina) for southwestern Atlantic sharks, and off Paita and Guanape Cove (Peru), in Sebastián Vizcaíno Bay (Mexico), and in and around San Diego Bay for eastern Pacific sharks.[1]

Most sources estimate a gestation period of 12 months, though some data support the interpretation of a 15–21 month long gestation period instead.[1][29] Females produce litters every other year, with the number of pups ranging from 7 to 24 and averaging 15 or 16. Females off California and the Baja Peninsula tend to bear fewer young relative to other parts of the world. The newborns measure 55–67 cm (22–26 in) long.[1][6] The copper shark is among the slowest-growing Carcharhinus species: off South Africa, males reach sexual maturity at 2.0–2.4 m (6.6–7.9 ft) long and an age of 13–19 years, while females mature at 2.3–2.5 m (7.5–8.2 ft) long and an age of 19–20 years.[16] Females off Australia mature at a comparable length of 2.5 m (8.2 ft), while females off Argentina mature at a slightly smaller length of 2.2 m (7.2 ft).[1][32] The maximum lifespan is at least 30 years for males and 25 years for females.[16]

Human interactions[edit]

The copper shark is often caught by recreational anglers.

Attacks on Humans[edit]

Copper sharks only attack humans infrequently, but the species places sixth in the number of unprovoked attacks on people. During the tracking period through 2013, the University of Florida attributed 20 attacks to the species.[4] (In comparison, great white sharks topped the list, with 279 attacks.) Though large and powerful, the copper shark is not particularly aggressive towards humans unless in the presence of food. Copper Sharks have been known to harass and attack spear fishers in an attempt to steal catches. Copper sharks have bitten several swimmers in Australia and New Zealand,[6][8] where the species is common. (The species is commonly called bronze whalers in this part of the world.)

Fatal attacks attributed to the copper shark (bronze whaler) include the 2014 death of a swimmer in Tathra, New South Wales, Australia,[33] and the 1976 death of a swimmer in Te Kaha, New Zealand.[34] Three out of ten shark attacks in New Zealand are attributed to Copper sharks.[35] Witnesses also attributed a fatal attack on September 2011 in Bunker Bay, Western Australia to a copper shark.[36]

One problem with counting attacks on humans is that the copper shark is so similar to other requiem sharks. Victims and witnesses are unlikely to correctly identify which type of genus Carcharhinus shark is responsible for the attack.[37] Experts trying to confirm shark attacks by species warn that their statistics undercount the number of attacks by requiem sharks like the copper.[38]

Captivity[edit]

Like many large, active sharks, this species adapts poorly to captivity; it tends to bump into the sides of its enclosure, and the resulting abrasions then become infected with often fatal consequences.[17]

Fishing[edit]

Commercial fisheries for the copper shark exist off New Zealand, Australia (though the "bronze whaler fishery" of Western Australia actually takes mostly dusky sharks), South Africa, Brazil, Uruguay, Argentina, Mexico, and China; it also contributes to the bycatch of other commercial fisheries across its range. This species is caught in gillnets and on bottom longlines, and to a much lesser extent in bottom trawls and on pelagic longlines.[1] The meat is sold for human consumption.[6] The copper shark is also popular with recreational fishers in New Zealand, Australia, South Africa, Argentina, Mexico and California, predominantly by anglers but also by bowfishers and gillnetters. In New Zealand, it is the Carcharhinus species most frequently caught by sport fishers and sustains a small, summer recreational fishery in northern North Island, that mainly captures pregnant and post-partum females and for the most part practices tag and release. A tag and release program is also practiced in Namibia.[1]

Conservation[edit]

The International Union for Conservation of Nature (IUCN) has assessed the copper shark as Near Threatened worldwide. While the global population is unknown, the long maturation time and low reproductive rate of this species render it highly susceptible to overfishing. Regionally, the IUCN has listed this species under Least Concern off Australia, New Zealand, and South Africa, where fisheries are generally well-managed; the local copper shark population for each of those three countries is contained almost entirely within their respective Exclusive Economic Zones (EEZ). Reported catches by New Zealand have steadily declined from a peak of 40 tons in 1995/96 to 20 tons 2001/02, though it is uncertain whether this reflects a genuine decline or changing fishing habits.[1]

In the eastern Pacific, the copper shark is rare and little fishery information is available, leading to an assessment of Data Deficient. However, catch declines across all shark and ray species have been documented in the heavily-fished Gulf of California. Off East Asia, the copper shark has been assessed as Vulnerable; though species-specific data is unavailable, shark populations overall have been decimated in the region. The number of large adults have been too low to sustain targeted fisheries since the 1970s, and most of the current shark catch consists of small juveniles. Additional threats to this species include the degradation and destruction of its coastal nurseries from development, pollution, and aquaculture, mortality from shark nets used to protect beaches in South Africa and Australia, and persecution by fish farmers in southern Australia.[1]

References[edit]

  1. ^ a b c d e f g h i j k l m n o p q r s t u Duffy, C. and I. Gordon (2003). "Carcharhinus brachyurus". IUCN Red List of Threatened Species. Version 2010.1. International Union for Conservation of Nature. Retrieved April 17, 2010. 
  2. ^ Compagno, L.J.V., M. Dando and S. Fowler (2005). Sharks of the World. Princeton University Press. pp. 292–293. ISBN 978-0-691-12072-0. 
  3. ^ "Carcharhinus brachyurus (Bronze Whaler, Cocktail Shark, Copper Shark, Narrowtooth Shark, New Zealand Whaler), ICUN Red List of Threatened Species". International Union for Conservation of Nature and Natural Resources. "No estimates of population size or biomass are available. Global population structure is unknown. Stock structure is not known for any fished population." 
  4. ^ a b "ISAF Statistics on Attacking Species of Shark". Florida Museum of Natural History, University of Florida. Retrieved 6 April 2014. 
  5. ^ a b Günther, A.C.L.G. (1870). Catalogue of the Fishes in the British museum, Volume 8. The Trustees. p. 369. 
  6. ^ a b c d e f g h Ebert, D.A. (2003). Sharks, Rays, and Chimaeras of California. University of California Press. pp. 149–152. ISBN 0-520-23484-7. 
  7. ^ a b c d e f g Compagno, L.J.V. (1984). Sharks of the World: An Annotated and Illustrated Catalogue of Shark Species Known to Date. Food and Agricultural Organization of the United Nations. pp. 464–466. ISBN 92-5-101384-5. 
  8. ^ a b c Ferrari, A. and A. Ferrari (2002). Sharks. Firefly Books. pp. 164–165. ISBN 1-55209-629-7. 
  9. ^ a b Froese, Rainer and Pauly, Daniel, eds. (2010). "Carcharhinus brachyurus" in FishBase. April 2010 version.
  10. ^ a b c Garrick, J.A.f. (1982). Sharks of the genus Carcharhinus. NOAA Technical Report, NMFS Circ. 445: 1–194.
  11. ^ Compagno, L.J.V. (1988). Sharks of the Order Carcharhiniformes. Princeton University Press. pp. 319–320. ISBN 0-691-08453-X. 
  12. ^ Naylor, G.J.P. (1992). "The phylogenetic relationships among requiem and hammerhead sharks: inferring phylogeny when thousands of equally most parsimonious trees result". Cladistics 8 (4): 295–318. doi:10.1111/j.1096-0031.1992.tb00073.x. 
  13. ^ Heim, B. and J. Bourdon (January 27, 2009). Fossil species: Carcharhinus brachyurus. The Life and Times of Long Dead Sharks. Retrieved on April 11, 2010.
  14. ^ Marsili, S. (March 2007). "Revision of the teeth of the genus Carcharhinus (Elasmobranchii; Carcharhinidae) from the Pliocene of Tuscany, Italy". Rivista Italiana di Paleontologia e Stratigrafia 113 (1): 79–95. 
  15. ^ Long, D.J. (May 24, 1993). "Preliminary list of the marine fishes and other vertebrate remains from the Late Pleistocene Palos Verdes Sand Formation at Costa Mesa, Orange County, California". Paleobios 15 (1–4): 9–13. 
  16. ^ a b c Walter, J.P. and D.A. Ebert (1991). "Preliminary estimates of age of the bronze whaler Carcharhinus brachyurus (Chondrichthyes: Carcharhinidae) from southern Africa, with a review of some life history parameters". South African Journal of Marine Science 10: 37–44. doi:10.2989/02577619109504617. 
  17. ^ a b c Hennemann, R.M. (2001). Sharks & Rays: Elasmobranch Guide of the World. IKAN-Unterwasserarchiv. p. 133. ISBN 3-925919-33-3. 
  18. ^ a b Van der Elst, R. (1993). A Guide to the Common Sea Fishes of Southern Africa (third ed.). Struik. p. 35. ISBN 1-86825-394-5. 
  19. ^ a b Last, P.R. and J.D. Stevens (2009). Sharks and Rays of Australia (second ed.). Harvard University Press. pp. 254–255. ISBN 0-674-03411-2. 
  20. ^ a b c Press, M. Biological Profiles: Narrowtooth Shark. Florida Museum of Natural History Ichthyology Department. Retrieved on April 18, 2010.
  21. ^ Schmidt, G.D. and I. Beveridge (June 1990). "Cathetocephalus australis n. sp. (Cestoidea: Cathetocephalidae) from Australia, with a Proposal for Cathetocephalidea n. ord". The Journal of Parasitology (The American Society of Parasitologists) 76 (3): 337–339. doi:10.2307/3282661. JSTOR 3282661. 
  22. ^ Beveridge, I. and R.A. Campbell (February 1993). "A revision of Dasyrhynchus Pintner (Cestoda: Trypanorhyncha), parasitic in elasmobranch and teleost fishes". Systematic Parasitology 24 (2): 129–157. doi:10.1007/BF00009597. 
  23. ^ Richmond, C. and J.N. Caira (May 1991). "Morphological investigations into Floriceps minacanthus (Trypanorhyncha: Lacistorhynchidae) with analysis of the systematic utility of scolex microtriches". Systematic Parasitology 19 (1): 25–32. doi:10.1007/bf00010299. 
  24. ^ Caira, J.N., C. Richmond and J. Swanson (October 2005). "A revision of Phoreiobothrium (Tetraphyllidea : Onchobothriidae) with descriptions of five new species". Journal of Parasitology 91 (5): 1153–1174. doi:10.1645/GE-3459.1. PMID 16419764. 
  25. ^ Campbell, R.A. and I. Beveridge (1993). "New species of Grillotia and Pseudogrillotia (Cestoda: Trypanorhyncha) from Australian sharks, and definition of the family Grillotiidae Dollfus, 1969". Transactions of the Royal Society of South Australia 117 (1–2): 37–46. 
  26. ^ Soto, J.M.R. (November 2000). "Marine leech, Stibarobdella macrothela (Schmarda, 1861) (Hirudinea, Piscicolidae), parasitic on the whaler shark, Carcharhinus brachyurus (Gunther, 1870) (Chondrichthyes, Carcharhinidae), in southern Brazilian waters". Revista Brasileira de Biologia 60 (4): 713–714. doi:10.1590/S0034-71082000000400024. 
  27. ^ a b Smale M.J. (1991). "Occurrence and feeding of three shark species, Carcharhinus brachyurus, C. obscurus and Sphyrna zygaena, on the Eastern Cape coast of South Africa". South African Journal of Marine Science 11: 31–42. doi:10.2989/025776191784287808. 
  28. ^ Heithaus, M.R. (January 2001). "Predator-prey and competitive interactions between sharks (order Selachii) and dolphins (suborder Odontoceti): a review". Journal of Zoology 253: 53–68. doi:10.1017/S0952836901000061. 
  29. ^ a b c Cliff, G. and S.F.J. Dudley (1992). "Sharks caught in the protective gill nets off Natal, South Africa. 6. The copper shark Carcharhinus brachyurus (Günther)". South African Journal of Marine Science 12: 663–674. doi:10.2989/02577619209504731. 
  30. ^ Pescak, T.P. (2005). Currents of Contrast: Life in Southern Africa's Two Oceans. Struik. p. 122. ISBN 1-77007-086-9. 
  31. ^ Lamberth, S.J. (November 2006). "White shark and other chondrichthyan interactions with the beach-seine (treknet) fishery in False Bay, South Africa". African Journal of Marine Science 28 (3–4): 723–727. doi:10.2989/18142320609504222. 
  32. ^ a b c d Lucifora, L.O., R.C. Menni and A.H. Escalante (2005). "Reproduction and seasonal occurrence of the copper shark, Carcharhinus brachyurus, from north Patagonia, Argentina". ICES Journal of Marine Science 62 (1): 107–115. doi:10.1016/j.icesjms.2004.09.003. 
  33. ^ Anna Leask; Kieran Campbell; Andrew Koubaridis (Feb 27, 2013). "Shark victim named". New Zealand Herald. "He spoke of the concern he held for his friends when he saw a large bronze whaler shark, assuming his wife was already safely ashore." 
  34. ^ Leask, A., K. Campbell, and A. Koubaridis (February 27, 2013). "Shark Victim Named". NZ Herald. Retrieved April 10, 2014. 
  35. ^ "Shark Victim Named". NZ Herald. "A DECADE OF SHARK ATTACKS IN NZ" 
  36. ^ Rickard, L. (September 5, 2011). "Shark attack witness tells of mauling horror". The Sydney Morning Herald. Retrieved September 5, 2011. 
  37. ^ Burgess, George. "ISAF Statistics on Attacking Species of Shark". International Shark Attack File Florida Museum of Natural History, University of Florida. Retrieved 12 April 2014. "Positive identification of attacking sharks is very difficult since victims rarely make adequate observations of the attacker during the "heat" of the interaction. Tooth remains are seldom found in wounds and diagnostic characters for many requiem sharks (family Carcharhinidae) are difficult to discern even by trained professionals. That said, this list must be used with caution because attacks involving easily identified species, such as white, tiger, sandtiger, hammerhead and nurse sharks, nearly always identify the attacking species, while cases involving difficult to identify species, such as requiem sharks of the genus Carcharhinus, seldom correctly identify the attacker. Thus the list is skewed to readily identified species." 
  38. ^ "ISAF Statistics on Attacking Species of Shark". International Shark Attack File Florida Museum of Natural History, University of Florida. Retrieved 12 April 2014. "A number of requiem sharks in the genus Carcharhinus likely are involved in many more attacks than they are credited in this list and, if the list could reflect that reality, Carcharhinus bites would push such species as the sandtiger, hammerhead and nurse sharks towards the bottom of the list." 
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