Carcharhinidae

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Carcharhinidae
Requiem sharks
Carcharhinidae characteristics
 5 gill slits
 2 dorsal fins
 No fin spines
 Caudal fin w/ strong ventral lobe
 Mouth behind eyes
 Round eyes w/ nictitating eyelids
 Long arched mouth w/ bladelike teeth
 Short labial furrows
 Mostly unpatterned
 Mostly medium to large
 100-300 cm
 Some smaller
 ~100
 Active strong swimmers
 More nocturnal
 Ram ventilators & buccal breathers
Behavior
 Some solitary
 Some socialize in small groups
 Some social schooling spp.
 Clear hierarchical dominance b/t spp.
 Oceanic whitetip (Carcharhinus longimanus) dominate silky sharks
 Silky sharks (Carcharhinus falciformis) dominate grey reef sharks
(Carcharhinus amblyrhynchos)
Taxonomy
 Order Carcharhiniformes
 Family carcharhinidae
 12 genera (8 monotypic)
 ~50 spp.
(31 are in genus Carcharhinus)
 Examples include
 Tiger shark (Galeocerdo cuvier)
 Bull shark (Carcharhinus leucas)
 Blacktip reef (Carcharhinus melanopterus)
 Sharpnose sharks (Rhizopriondon spp.)
 Lemon Shark (Negaprion brevirostris)
Distribution
 Temperate and tropical seas
 Majority tropical continental shelves & offshore




Some coral reefs
Some deep water
Benthopelagic
Pelagic-Blue Shark (Prionace glauca), Oceanic Whitetip (Carcharhinus
longimanus), Silky Shark (Carcharhinus falciformis)
 All over the world
Feeding
 Wide variety
 Teleosts
 Crustaceans
 Mollusks
 Elasmobranchs
 Seabirds
 Reptiles
 Marine mammals
Reproduction
 Most placental viviparous
 Galeocerdo cuvier is ovoviviparous
 Biennial or triennial reproductive cycle
Status
 Important in commercial, subsistence and sports fisheries
 used for
 Food
 Liver oil
 Fins-especially blue shark
 Skin
 Ecotourism
 Have bitten people
 Caught as bycatch
 Red list mixed from data deficient; threatened to endangered; many near threatened
Literature cited
 Compagno, L.M. Dando, and S. Fowler. 2005. Sharks of the world. Princeton University
Press, Princeton, NJ. Pp288-322
 Whitney NM, Crow GL. 2007. Reproductive biology of the tiger shark (Galeocerdo
cuvier) in Hawaii. Marine Biology. 151 (1).pp63-70
 Yokota K, Kiyota M, Minami H.2006.Shark catch in a pelagic longline fishery:
Comparison of circle and tuna hooks. Fisheriess Research. 81.pp 337-341.
 Clarke SC, McAllister MK, Milner-Gulland EJ, et al.2006.Global estimates of shark
catches using trade records from commercial markets .Ecology Letter 9.pp 1115-1126
 Campana SE, Marks L, Joyce W, et al. Effects of recreational and commercial fishing on
blue sharks (Prionace glauca) with inferences on the North Atlantic
population. CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES 63.
pp 670-682
 IUNC 2006. 2006 IUCN red list of threatned species. At http:// www.iuncnredlist.org
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