Leopard shark (Triakis semifasciata)

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Leopard shark
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Leopard shark fact file

Leopard shark description

KingdomAnimalia
PhylumChordata
ClassChondrichthyes
OrderCarcharhiniformes
FamilyTriakidae
GenusTriakis (1)

The leopard shark (Triakis semifasciata) is named for its striking patterning, consisting of dark saddles and splotches on the fins and upper body, set against an overall silver or bronzed grey body colouration (2) (3). The snout is relatively broad and short, and the body features a prominent, rounded first dorsal fin, roughly mid-way along the body and a smaller pointed dorsal fin, situated towards the rear. The caudal fin is also distinctive, with an elongated upper lobe featuring a conspicuous notch. Leopard shark teeth are arranged in overlapping rows, forming a broad, ridged and pointed surface on the upper and lower jaws (2).

Size
Average size: 1.2 – 1.5 m (2)
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Leopard shark biology

Active during the day and night (3), the leopard shark is often encountered in large, nomadic schools, sometimes mixed with grey and brown smoothhound sharks (Mustelus californicus and Mustelus henlei) and piked dogfish (Squalus acanthias) (1). A large variety of prey is taken, including crabs, shrimps, octopi, fat innkeeper worms (Urechis caupo), fish and fish eggs (2) (4). Burrowing marine invertebrates are one of the most commonly taken food sources, and are extracted by means of the shark grasping exposed parts with its specialised teeth (2).

Recent research indicates that the leopard shark has smaller and more numerous red blood cells than related shark species. This adaptation allows the shark to absorb oxygen more easily and may confer a competitive advantage over some of its close relatives in low oxygen environments such as estuaries (2).

The leopard shark is an ovoviviparous species, which means that it produces eggs that develop and hatch internally, and therefore gives birth to live young (5). Following a gestation period of between 10 and 12 months, a litter of 4 to 33 pups are born, usually between April and May (2). The young measure around 20 centimetres at birth, and grow slowly, only reaching reproductive maturity at an age of around ten years (5).

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Leopard shark range

The leopard shark inhabits the eastern Pacific Ocean, occurring in waters off the coast of Oregon, south to the Gulf of California, Mexico. It is a relatively common species, occurring in large numbers in San Francisco Bay and other large estuaries (1) (2).

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Leopard shark habitat

The leopard shark inhabits cool and temperate inshore and offshore waters, typically on or near the bottom in shallow water, from the intertidal zone to depths of four metres, although it has been recorded at depths of up to 91 metres. This species’ preferred habitats include sandy areas, mud flats, estuaries, and rock strewn bottoms near rocky reefs and kelp beds (1).

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Leopard shark status

The leopard shark is classified as Least Concern (LC) on the IUCN Red List (1).

IUCN Red List species status – Least Concern

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Leopard shark threats

The leopard shark’s meat is used for human consumption, and it is therefore commonly taken by both commercial and recreational fishers. Like most sharks, as a result of slow growth, late maturity and low reproductive output, this species is vulnerable to overexploitation. Nevertheless at the current time the leopard shark is not considered to be threatened. A rise in spearfishing has possibly caused some declines in areas of California, but due to recent implementation of shark management plans, there is little cause for concern. The status of the leopard shark in Mexico is less clear, as there is little information available regarding catch rates or population size (1).

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Leopard shark conservation

Thanks to management plans introduced in U.S.A. waters in recent decades, the core population of the leopard shark in the waters around California and Oregon is protected from overfishing (1).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

Learn more about the conservation of sharks and rays: 

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Caudal fin
The tail fin of a fish.
Dorsal fin
Referring to the fins found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Gestation
The state of being pregnant; the period from conception to birth.
Invertebrates
Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians (jellyfish, corals, sea anemones), echinoderms, and others.
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References

  1. IUCN Red List (May, 2011)
    http://www.iucnredlist.org
  2. Florida Museum of Natural History (July, 2009)
    http://www.flmnh.ufl.edu/fish/gallery/descript/leopardshark/leopardshark.html
  3. Burnie, D. (2001) Animal. Dorling Kindersley, London.
  4. FishBase (July, 2009)
    http://www.fishbase.gr/summary/Speciessummary.php?id=2543
  5. MarineBio (July, 2009)
    http://marinebio.org/species.asp?id=55
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Leopard shark  
Leopard shark

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