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Sphyrna lewini (Griffith & Smith, 1834)

Scalloped hammerhead
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Sphyrna lewini   AquaMaps   Data sources: GBIF OBIS
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Image of Sphyrna lewini (Scalloped hammerhead)
Sphyrna lewini
Picture by Randall, J.E.


Tuvalu country information

Common names: [No common name]
Occurrence: native
Salinity: marine
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments:
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/tv.html
National Fisheries Authority: http://www.spc.org.nc/coastfish/Countries/tuvalu/tuvalu.htm
Occurrences: Occurrences Point map
Main Ref: Japan International Cooperation Agency, 1987
National Database:

Common names from other countries

Classification / Names Tên thường gặp | Các synonym ( Các tên trùng) | Catalog of Fishes(Giống, Các loài) | ITIS | CoL | WoRMS | Cloffa

Lớp phụ Cá sụn (cá mập và cá đuối) (sharks and rays) > Carcharhiniformes (Ground sharks) > Sphyrnidae (Hammerhead, bonnethead, or scoophead sharks)
Etymology: Sphyrna: Probable misspelling of sphyra (Gr.), hammer, referring to their hammer-shaped heads. (See ETYFish);  lewini: Patronym not identified, perhaps in honor of John Lewin (1770-1819), who illustrated early volumes of Australian natural history (this shark was described from Australia) and may be the “Mr. Lewin” who illustrated the plates in Griffith and Smith’s book. (See ETYFish).

Environment: milieu / climate zone / depth range / distribution range Sinh thái học

Biển; Thuộc về nước lợ; Ở đại duơng, biển (Ref. 51243); Mức độ sâu 0 - 1043 m (Ref. 89972), usually 0 - 25 m (Ref. 26999).   Tropical; 46°N - 39°S, 180°W - 180°E

Sự phân bố Các nước | Các khu vực của FAO | Các hệ sinh thái | Những lần xuất hiện | Point map | Những chỉ dẫn | Faunafri

Circumglobal in coastal warm temperate and tropical seas (Ref. 13562). Western Atlantic: New Jersey, USA to Uruguay (Ref. 58839), including the Gulf of Mexico and Caribbean. Eastern Atlantic: western Mediterranean (Ref. 6678) to Namibia (Ref. 6812). Indo-Pacific: Persian Gulf (Ref. 68964), Red Sea, East Africa and throughout the Indian Ocean; Japan to New Caledonia, Hawaii and Tahiti. Eastern Pacific: southern California, USA to Ecuador, probably Peru.

Length at first maturity / Bộ gần gũi / Khối lượng (Trọng lượng) / Age

Maturity: Lm 210.5, range 140 - 273 cm
Max length : 430 cm TL con đực/không giới tính; (Ref. 26938); common length : 360 cm TL con đực/không giới tính; (Ref. 13562); Khối lượng cực đại được công bố: 152.4 kg (Ref. 40637); Tuổi cực đại được báo cáo: 35 các năm (Ref. 31395)

Short description Khóa để định loại | Hình thái học | Sinh trắc học

Các tia vây lưng cứng (tổng cộng) : 0; Tia cứng vây hậu môn: 0. This hammerhead shark is distinguished by having the following characters: large, moderately slender body; broad, narrow bladed head, arched anterior margin with prominent median indentation and lateral indentation; nostrils with strong prenarial grooves; hind margins of eyes slightly posterior to or nearly opposite front of mouth; teeth triangular, deeply notched posteriorly, with smooth or finely serrated edges; first dorsal fin moderately high, second dorsal and pectoral fins low; upper precaudal pit transverse crescentric. Colour of body light grey or greyish brown above, shading to white below, pectoral fin tips dusky and a dark blotch on lower caudal fin lobe (Ref. 13562, 114967).

Sinh học     Tự điển (thí dụ epibenthic)

A coastal-pelagic, semi-oceanic shark occurring over continental and insular shelves and adjacent deep water, often approaching close inshore and entering enclosed bays and estuaries (Ref. 244, 11230, 58302). Found in inshore and offshore waters to about 275 m depth (Ref. 26938, 11230, 58302); has been filmed at a baited camera in 512 m depth (Lis Maclaren, pers. comm. 2005). Huge schools of small migrating individuals move pole ward in the summer in certain areas (Ref. 244). Permanent resident populations also exist (Ref. 244). Juveniles occur in coastal areas (Ref. 58784). Adults solitary, in pairs, or schools; young in large schools (Ref. 13562). Feed mainly on teleost fishes and cephalopods (Ref. 6871), also lobsters, shrimps, crabs (Ref. 30573), including other sharks and rays (Ref. 37816). Viviparous (Ref. 50449). Mature females produce 15-31, of 43-55 cm young in a litter (Ref. 26938, 1602). Considered potentially dangerous to people but often not aggressive when approached by divers (Ref. 13562). Readily available to inshore artisanal and small commercial fisheries as well as to offshore operations (Ref. 13562). Sold fresh, dried-salted, smoked and frozen; also sought for its fins and hides (Ref. 9987). Oil used for vitamins and carcasses for fishmeal (Ref. 13562). Maximum depth from Ref. 125614.

Life cycle and mating behavior Maturities | Sự tái sinh sản | Spawnings | Egg(s) | Fecundities | Ấu trùng

Viviparous, placental (Ref. 50449), with 13-23 in a litter (Ref. 6871); 12-41 pups after a gestation period of 9-10 months (Ref.58048). Size at birth 45-50 cm TL (Ref. 13562); 39-57 cm TL (Ref.58048).

Main reference Upload your references | Các tài liệu tham khảo | Người điều phối : Compagno, Leonard J.V. | Người cộng tác

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)

  Critically Endangered (CR) (A2bd); Date assessed: 08 November 2018

CITES (Ref. 128078)


Threat to humans

Other (Ref. 13562)




Human uses

Các nghề cá: Tính thương mại; cá để chơi: đúng
FAO(Các nghề cá: Sản xuất, species profile; publication : search) | FIRMS (Stock assessments) | FishSource | Biển chung quanh ta

Thêm thông tin

Trophic ecology
Các loại thức ăn
Diet compositions
Food consumptions
Food rations
Các động vật ăn mồi
Ecology
Sinh thái học
Home ranges
Population dynamics
Growths
Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversions
Recruitments
Abundances
Life cycle
Sự tái sinh sản
Maturities
Fecundities
Spawnings
Spawning aggregations
Egg(s)
Egg developments
Ấu trùng
Sự biến động ấu trùng
Anatomy
Gill areas
Não bộ
Otoliths
Physiology
Body compositions
Nutrients
Oxygen consumptions
Dạng bơi
Swimming speeds
Visual pigment(s)
Âm thanh của cá
Diseases / Parasites
Toxicities (LC50s)
Genetics
Di truyền
Electrophoreses
Heritabilities
Human related
Aquaculture systems
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Estimates based on models

Preferred temperature (Ref. 115969): 18.7 - 29, mean 27.2 (based on 2890 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5029   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00355 (0.00281 - 0.00449), b=3.10 (3.03 - 3.17), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Mức dinh dưỡng (Ref. 69278):  4.1   ±0.5 se; based on diet studies.
Thích nghi nhanh (Ref. 120179):  thấp, thời gian nhân đôi của chủng quần tối thiểu là 4.5 - 14 năm (rm=0.028; K=0.05-0.24; tm=3-15; tmax=41.6; Fec=13-23).
Prior r = 0.06, 95% CL = 0.04 - 0.09, Based on 2 data-limited stock assessments.
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (78 of 100).
Climate Vulnerability (Ref. 125649):  High vulnerability (62 of 100).
Price category (Ref. 80766):   Medium.