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IUCN threat status:

Vulnerable (VU)

Comprehensive Description

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Description

  Common names: shark (English), tiburón (Espanol)
 
Carcharhinus obscurus (Lesueur, 1818)


Dusky shark



Body moderately slender to moderately stout;  snout moderately short, broad, rounded, length 1-1.4 in distance between nostrils; nasal flaps rudimentary;  upper front teeth broadly triangular, straight to a little oblique, serrated; lower front teeth with low, narrow, serrated points; low ridge on back between dorsal fins; origin of first dorsal fin over or slightly behind free rear corner of pectoral fins; first dorsal fin relatively low (height 6-9.1% of TL),  front edge broadly arched, tip pointed to narrowly rounded; origin of second dorsal above anal fin origin, with long free rear tip; pectoral long, curved, pointed tip.


Very similar in appearance and easily confused with  C. galapagensis;  best means of separation is the lower dorsal fin: 5.8-9.9 % of TL in C. obscurus  vs 9.1-12.1% of TL in C. galapagensis.


Grey, shading to white ventrally, with a faint, near-horizontal, grey band invading the white of upper abdomen; tips of fins dusky.

Size: reaches 420 cm; size at birth 69-100 cm.

Habitat: Inshore to offshore coastal- pelagic, primarily on continental shelves, not in low salinity habitats.

Depth: 0-400 m.

Circumglobal in tropical and warm temperate seas; from California to the Gulf of California and central Mexico, and the Revillagigedos.
   

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© Shorefishes of the tropical eastern Pacific online information system. www.stri.org/sftep

Source: Shorefishes of the Tropical Eastern Pacific Online Information System

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