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Overview |
Main identification features
- slender
- low ridge between dsds - elongate rear tips
- long, narrow, pointed snout
- top teeth - oblique tip, serrated at rear
Body fusiform and stout; eyes somewhat large, nictitating eyelid present; snout elongate, narrow, pointed; nasal flap short with narrow base mouth small; lower teeth with a single narrow upright point, upper teeth with oblique point, rear edge serrated; very short labial folds; spiracles absent; gill slits short, last two over pectoral fin base; first dorsal low, front edge weakly convex, rear margin concave, with an elongate rear tip, front of base over rear of pectoral fin margin; second dorsal very small, with an elongate rear tip, base over anal fin; pectoral fins long, narrow; low ridge present between dorsal fins; no keel on tail base.
Greyish blue above with scattered black spots, greyish white below, eyes green, mouth white.
Size: 280 cm
Coastal and semi-oceanic
Depth: 0 - 600 m
Found on both sides of the Atlantic; unconfirmed reports from the coast of Panama in the eastern Pacific.
Attributes
Cites: Not listed.
Climate Zone: Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo).
Depth Range Max: 600 m.
Depth Range Min: 0 m.
Diet: octopus/squid/cuttlefish; bony fishes.
Eastern Pacific Range: Northern limit=9; Southern limit=3; Western limit=-83; Eastern limit=-78; Latitudinal range=6; Longitudinal range=5.
Egg Type: Live birth.
Feeding Group: Carnivore.
FishBase Habitat: Bentho-Pelagic.
Global Endemism: East Pacific + Atlantic (East +/or West); TEP non-endemic; East Pacific + all Atlantic (East+West); All species.
Habitat: Water column.
Inshore Offshore: Offshore; Inshore; In & Offshore.
IUCN Red List: Not evaluated / Listed.
Length Max: 280 cm.
Regional Endemism: Tropical Eastern Pacific (TEP) non-endemic; Eastern Pacific non-endemic; Continent only; Continent; All species.
Residency: Resident.
Salinity: Marine; Marine Only.
Water Column Position: Surface; Near Surface; Mid Water; Near Bottom; Bottom + water column; Bottom;
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Names |
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Links to other sites |
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References |
- Poey, F., 1868., Synopsis piscium cubensium. Catalogo Razonado de los peces de la isla de Cuba., Repertorio Fisico-Natural de la Isla de Cuba, 2:279-484.
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Acknowledgements |
I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.
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http://www.fishbase.org/Summary/speciesSummary.php?genusname=Carcharhinus&speciesname=signatus ---> http://192.134.151.83/Summary/speciesSummary.php?genusname=Carcharhinus&speciesname=signatus http://192.134.151.83/Summary/speciesSummary.php?genusname=Carcharhinus&speciesname=signatus ---> https://fishbase.mnhn.fr/Summary/speciesSummary.php?genusname=Carcharhinus&speciesname=signatus https://fishbase.mnhn.fr/Summary/speciesSummary.php?genusname=Carcharhinus&speciesname=signatus ---> https://fishbase.mnhn.fr/summary/Carcharhinus-signatus.html
Carcharhinus signatus, Night shark : fisheries
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Elasmobranchii (sharks and rays) >
Carcharhiniformes
(Ground sharks) >
Carcharhinidae
(Requiem sharks)
Etymology:
Carcharhinus:
karcharos
(Gr.), sharp or jagged;
rhinus
, an ancient name for sharks, from
rhine
(Gr.), rasp, both words alluding to a shark's jagged, rasp-like skin. (
See ETYFish
)
;
signatus:
Latin for marked, probably referring to indentation on outer margins of upper teeth (described from jaws only). (
See ETYFish
)
.
More on author:
Poey
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; benthopelagic; depth range 0 - 600 m (Ref.
244
), usually 50 - 100 m (Ref.
244
). Subtropical; 11°C - 16°C (Ref.
244
); 39°N - 43°S, 98°W - 15°E (Ref.
55190
)
Western Atlantic: Delaware to Florida (USA), Bahamas, and Cuba; southern Brazil, Argentina (Ref.
244
). Eastern Atlantic: Senegal to Côte d'Ivoire, Ghana to Cameroon, Democratic Republic of the Congo, Angola, off northern Namibia (Ref.
244
,
5578
).
Length at first maturity / Size / Weight / Age
Maturity: L
m
202.5
, range 150 - 205 cm
Max length : 280 cm TL male/unsexed; (Ref.
244
); common length : 200 cm TL male/unsexed; (Ref.
26999
); max. published weight: 76.7 kg (Ref.
40637
)
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 0;
Anal
spines
: 0;
Anal
soft rays
: 0. A slim shark with a very long, pointed snout, large eyes, and small jaws with oblique-cusped serrated upper teeth; dorsal fins low with elongated rear tips; interdorsal ridge present (Ref.
5578
). Grey-brown above, white below; no conspicuous fin markings (Ref.
5578
).
Coastal and semi-oceanic species found on or along outer continental and insular shelves (Ref.
244
). Found to depths of 40 m (Ref.
26938
). Forms schools (Ref.
244
). Nocturnal (Ref.
5578
), and feeding mainly on small bony fishes and squid (Ref.
244
). Viviparous (Ref.
50449
). Off West Africa, recorded water parameters at 90 to 285 m, where it was caught includes: temperature = 11 to 16°C; salinity = 36 ppt; oxygen = 1.81 ml/l (Ref.
244
). Not known to be dangerous to people (Ref.
244
).
Viviparous, placental (Ref.
50449
), with 4 to 12 young in a litter (Ref.
244
). Size at birth about 60 cm (Ref.
244
). Distinct pairing with embrace (Ref.
205
).
Compagno, L.J.V.
, 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref.
244
)
IUCN Red List Status (Ref.
130435
)
Endangered (EN)
(A2bd); Date assessed:
21 June 2019
CITES
Appendix II:
International trade monitored
Not Evaluated
Threat to humans
Harmless (Ref.
244
)
Human uses
Fisheries: commercial
FAO - Fisheries:
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; Publication:
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Zoological Record
Estimates based on models
Preferred temperature (Ref.
123201
): 15.8 - 27, mean 21.7 °C (based on 178 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00457 (0.00292 - 0.00715), b=3.08 (2.96 - 3.20), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.6 ±0.0 se; based on diet studies.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (tm=8-10; Fec=4; Tmax=17; K=0.12).
Fishing Vulnerability (Ref.
59153
): High to very high vulnerability (73 of 100).
Price category (Ref.
80766
):
Medium
.
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Updated: 2024-05-23 06:27:45 gmt
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