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 Dusky shark (Carcharhinus obscurus)

  Index
> Photo
> Range Map
> Systematics
> Name
> Appearance
> Coloration
> Distribution
> Biology
> Feeding
> Size
> Reproduction
> Similar Species
> Endangerment
> Danger to Humans

 Photo

Dusky shark
No image of Dusky shark found in the Shark Database
 Range Map

Earth Map


 Systematics

Phylum: Vertebates (Chordata)

Class: Carlilagenous Fishes (Chondrichthyes)
  Order: Ground sharks (Carcharhiniformes)
    Family: Requiem sharks (Carcharhinidae)
      Genus: Carcharhinus (Carcharhinus)


 Name

Scientific: Carcharhinus obscurus
German: Düsterer Hai, Schwarzhai
English: Dusky shark, Black whaler, Bronze whaler
French: Requin sombre
Spanish: Tiburón arenero


 Appearance

Large, with a short, broadly rounded snout. Fairly large eyes. Origin of first dorsal fin is usually over or slightly in front of the rear tips of the pectoral fins. Low interdorsal ridge.

 Coloration

Blue to grey upper body, white ventral surface. The tips of most fins are dusky, not black or white. Inconspicuous white band on the flanks.

 Distribution

Western Atlantic: Southern Massachusetts to Florida. Bahamas, Cuba, northern Gulf of Mexico. Nicaragua, southern Brazil. Eastern Atlantic: Possibly Portugal, Morocco, Madeira, Canary and Cape Verde Islands, Senegal and Sierra Leone. Western Indian Ocean: South Africa, Mozambique, Madagascar. Western Pacific: Japan, China, Viet Nam, Australia, New Caledonia. Eastern Atlantic: Southern California.

 Biology

Commonly found inshore and offshore of warm-temperate and tropical area from the surface to 400 m depth. This species is strongly migratory in temperate and subtropical areas (North Pacific and North Atlantic).

 Feeding

Feeds on a variety of reef, bottom and pelagic fishes, as well as angel sharks, saw sharks, spiny dogfishes, cat sharks, smooth-hounds, and other grey sharks (blacktip sharks, spinner sharks).

 Size

Maximum size possibly over 400 cm (females), males reach about 340 cm.

 Reproduction

Viviparous, with yolksac-placenta. 3 to 14 pups per litter. Size at birth between 70 and 100 cm. Births may occur over a long time span of several months in pupping areas, and have been reported as occurring from late winter to summer. Males mature at about 280 cm, females mature between 260 cm and 300 cm. Age at maturity about 6 years, expected life span at least 18 years.

 Similar Species

Similar species exist. Diagnostic features have to be used to properly identify species.

 Endangerment

Status in the IUCN Red List(1994):

Main criterion: > LR/nt (Low Risk/Near Threatened (1994))
Sub criterion:
Trend: Declining


 Danger to Humans

Potentially dangerous.



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