Family : Requiem sharks ; Found on continental and insular shelves, mainly over sandy, shell , and coral bottoms . Feeds on small fishes , including pinfish (Sparidae) and porcupine fish. Preyed on by larger sharks . Viviparous (with a yolk-sac placenta ), with 3 to 6 young per litter . Performs a 'hunch' display, with back arched, caudal lowered and head raised, as a possible threat display when confronted by divers . Utilized dried salted for human consumption .
Click on the language to view common names.
Common Names in Czech:
Žralok tmavonosý, ralok tmavonosý
Common Names in Danish:
Sortn, Sortnæset haj
Common Names in Dutch:
Common Names in English:
Common Names in Finnish:
Common Names in French:
Requin nez noir
Common Names in Japanese:
Common Names in Mandarin Chinese:
Common Names in Portuguese:
Ca, Cação, Cação-lombo-preto, Corta-garoupa, Lombo-preto
Common Names in Russian:
Common Names in Spanish:
Caz, Cazón, Cazon amarillo, Sarda, Tibur, tiburÃ³n cangÃ¼ay, tiburÃ³n limÃ³n, Tiburón amarillo, tiburón cangüay, Tiburón hocico negro, Tiburón limón, Tiburón tollo, Tollo
Species Carcharhinus acronotus
Distinctive Features: Blacknose sharks
are relatively small and slender
with a somewhat long rounded
snout and large eyes. This shark
its common name
from the characteristic black or dusky
of the snout. The origin
of the first dorsal fin is located
over the free
of the pectoral fins; the origin of the second
dorsal fin is over or slightly anterior of anal fin origin
. The margin
of the anal fin is deeply notched
. The interdorsal ridge
dorsal fins) is absent in this species and the caudal peduncle lacks
Coloration : The blacknose shark is gray to greenish gray with black or dusky tips on the second dorsal fin and dorsal caudal lobe . There is a black or dusky spot under the tip of the snout which is more distinct in younger individuals, hence the common name "blacknose shark". This spot makes this shark easy to distinguish from other gray shark species that occur in the same region.
Dentition: The upper jaw of the blacknose shark has 12-13 rows of teeth on each side with 11-12 rows on the lower jaw. Teeth on the upper jaw are moderately narrow and triangular with oblique cusps along with coarser serrations along the bases than the tips. The lower jaw also has cusped serrated teeth with broad bases. There is one symphysial tooth in the upper jaw and one or two in the lower jaw.
Denticles : Dermal denticles of the blacknose shark are closely spaced and overlapping. Each denticle has three longitudinal ridges and three posterior marginal teeth in embryos and young individuals while subadults and adults have denticles with 5 or 7 longitudinal ridges and 3-5 posterior marginal teeth.
Size, Age, and Growth: The average length of a full-grown blacknose shark is approximately 4.1 feet (125 cm TL ), reaching a maximum size of 4.6 feet (140cm TL). Depending on geographic location, maximum age is 10-16 years for females and 4.5-9 years for males. This shark commonly weighs about 22 pounds (10 kg ) at maturity. A relatively fast growing species, males reach maturity at 3-3.5 feet (95-105 cm), while females reach maturity at lengths between 3.3-3.5 feet (100 and 105 cm). Both sexes mature at about 2 years of age.
This shark is found in coastal tropical and warm temperate waters of the western Atlantic Ocean. As an inshore species, the blacknose shark resides in waters of continental shelves over sandy and coral bottoms . There is segregation by size and sex in this species. Juveniles are typically found in shallow water while adults are located at greater depths (over 30 feet (9 m )). This shark is known to form large schools and sometimes associates with schools of mullet and anchovies .
Typically found in water with a depth of 0 to -457 meters (0 to -1,499 feet).
A common coastal tropical
and warm-temperate shark
of the continental
shelves, mainly over sandy, shell
of 18?64 m
(Compagno et al.
The species may possibly reach 200 cm total length (TL ) (Compagno et al. 2005). Depending on the area, size at maturity is between 84.8 and 100.5cm Fork Length (FL ) for females and 84.8?91.8 cm (FL) for males (Clark and von Schmidt 1965, Dodrill 1977, Schwartz 1984, Driggers et al. 2004, Sulikowski et al. 2007, Carlson et al. in press ), In US South Atlantic waters males are reported to reach maturity at 4.3 years and females at 4.5 years of age (Driggers et al. 2004). Whereas in the Gulf of Mexico, males reportedly mature at 5.4 years and females at 6.6 years of age (Carlson et al. 2007). Longevity is estimated as 19 years in US South Atlantic waters and 16.5 years in the Gulf of Mexico, for females (Driggers et al. 2004, Carlson et al. 1999, Sulikowski et al. 2007). Generation period is estimated at eight years (Siegfreid and Brooks 2007) Reproduction is viviparous with a yolk-sac placenta . The species has a biennial reproductive cycle in US South Atlantic waters, but an annual cycle is reported in the Gulf of Mexico and off northern Brazil (Driggers et al. 2004, Sulikowski et al. 2007, Hazin et al. 2002). Females give birth to 1?5 pups after a gestation period of 9?11 months (Driggers et al. 2004, Carlson et al. 1999, Sulikowski et al. 2007). Size at birth is 31?35 cm FL (Driggers et al. 2004). .
List of Habitats :
The blacknose shark is a quick swimmer, feeding on small fishes including pinfish, croakers, porgies , anchovies , spiny boxfishes , and porcupine fish. It is also known to feed on octopus .
(development of yolk
) and gestation
in the blacknose shark
. This means that the ovaries ripen and develop
yolk in the few months prior to mating. The blacknose shark mates
in the fall
and gives birth spring-summer, having a gestation period
of about 8 months. The length
of the periods of vitellogenesis and
gestation together is about 10-11 months. It is not yet certain whether
the entire reproductive cycle is annual
or whether there is an extended
resting period between pregnancies.
Litter size for the blacknose shark is 3-6, but the usual number is 4. At birth, the young measure 17-20" (43-51 cm) in length. Bulls Bay , South Carolina (U.S.) is one known nursery area for this species.
Predators : Blacknose sharks may fall prey to larger sharks, including the dusky shark (Carcharhinus obscurus).
- Whittaker & Margulis,1978
- C. Linnaeus, 1758
- (Hatschek, 1888) Cavalier-Smith, 1983
- Grobben, 1908
- (Haeckel, 1874) Cavalier-Smith, 1998
- Bateson, 1885
- Cuvier, 1812
- Jawed Vertebrates
- Order: Carcharhiniformes ()
- Cohort: Neoselachii ()
- Infraclass: Euselachii ()
- Subclass: Elasmobranchii ()
- Class: Chondrichthyes ()
- Infraphylum: Gnathostomata () - auct. - Jawed Vertebrates
- Subphylum: Vertebrata () - Cuvier, 1812 - Vertebrates
- Phylum: Chordata () - Bateson, 1885 - Chordates
- Infrakingdom: Chordonia () - (Haeckel, 1874) Cavalier-Smith, 1998
- Branch: Deuterostomia () - Grobben, 1908
- Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
- Kingdom: Animalia () - C. Linnaeus, 1758 - animals
Carcharhinus acronotus • Prionodon curcuri Castelnau • Squalus acronotus • Squalus acronotus Poey • Squalus acronotus Poey, 1860
Status: Accepted Name
First described: Poey, F. Memorias sobre la historia natural de la isla de Cuba, acompañadas de sumarios latinos y extractos en francés. Vol. II. Imprenta de Barcina, Habana, Cuba., 1860.
Last scrutiny: Data last modified by FishBase 28-Oct-2000
Members of the genus Carcharhinus
ZipcodeZoo has pages for 36 species and subspecies in this genus:
C. acronotus (Blacknose Shark) · C. ahenea (Shortnose Blacktail Shark) · C. albimarginatus (Silvertip Shark) · C. altimus (Knopp´s Shark) · C. amblyrhynchoides (Graceful Shark) · C. amblyrhynchos (Shortnose Blacktail Shark) · C. amboinensis (Ambon Sharpnose Puffer) · C. azureus (Large Blacktip Shark) · C. borneensis (Borneo Mullet) · C. brachyurus (Black-Tipped Whaler) · C. brevipinna (Blacktipped Shark) · C. cautus (Sharks Bay Whaler Shark) · C. dussumieri (Whitecheek Shark) · C. falciformis (Sickle-Shaped Shark) · C. fitzroyensis (Creek Whaler Shark) · C. galapagensis (Galapagos Shark) · C. hemiodon (Pondicherry Shark) · C. isodon (Fintooth Shark) · C. leiodon (Smoothtooth Blacktip Shark) · C. leucas (Bull Shark) · C. limbatus (Blacktip Shark) · C. longimanus (Brown Milbert's Sand Bar Shark) · C. macloti (Hardnose Shark) · C. melanopterus (Black Fin Reef Shark) · C. obscurus (Dusky Shark) · C. perezi (Caribbean Reef Shark) · C. perezii (Caribbean Reef Shark) · C. plumbeus (Northern Whaler Shark) · C. porosus (Tiburon Peninsula Limia) · C. sealei (Black-Spot Shark) · C. signatus (Night Shark) · C. sorrah (West Australian Whaler Shark) · C. springeri (Reef Shark) · C. tilstoni (Australian Blacktip Shark) · C. velox (Whitenose Shark) · C. wheeleri (Blacktail Reef Shark)
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- Cathleen Bester. Florida Museum of Natural History
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- FishBase. Release date: January 5, 2010
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- Global Biodiversity Information Facility. Accessed March 01, 2008. http://www.gbif.org Mediated distribution data from 4 providers.
- IUCN 2012. IUCN Red List of Threatened Species. Version 2011.2. . Downloaded on January 28, 2012.
- Morgan, M., Carlson, J., Kyne, P.M. & Lessa, R. 2009. Carcharhinus acronotus. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloadedon 31January2012.
- Ruggiero M., Gordon D., Bailly N., Kirk P., Nicolson D. (2011). The Catalogue of Life Taxonomic Classification, Edition 2, Part A. In: Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist (Bisby F.A., Roskov Y.R., Orrell T.M., Nicolson D., Paglinawan L.E., Bailly N., Kirk P.M., Bourgoin T., Baillargeon G., Ouvrard D., eds). DVD; Species 2000: Reading, UK.
Accessed through GBIF Data Portal March 01, 2008:
- FishBase: FishBase DiGIR Provider - Philippine Server
- GBIF-Sweden: Fishes (NRM)
- Institute of Marine and Coastal Sciences, Rutgers University: ECNASAP - East Coast North America Strategic Assessment (OBIS Canada)
- Institute of Marine and Coastal Sciences, Rutgers University: iziko South African Museum - Shark Collection
- Museum national d'histoire naturelle: Ichtyologie
- Museum of Comparative Zoology, Harvard University: MCZ Fish Collection
- Senckenberg: Collection Pisces
- University of Kansas Biodiversity Research Center: Fish Collection
- Biodiversity Heritage Library NamebankID: 122881
- Catalogue of Life Accepted Name Code: Fis-23043
- Fishbase Species ID: 857
- Global Biodiversity Information Facility Taxonkey: 13529401
- Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 160304
- IUCN ID: 197915
- Zipcode Zoo Species Identifier: 105870
- Mean = -58.000 meters (-190.289 feet), Standard Deviation = 141.170 based on 10 observations. Ocean depth information for each observation from British Oceanographic Data Centre. [back]
- Morgan, M., Carlson, J., Kyne, P.M. & Lessa, R. 2009. Carcharhinus acronotus. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. <www.iucnredlist.org>. Downloaded on 31 January 2012. [back]