Scientific Name
Sphyrna mokarran  
Sphyrna mokarran無溝雙髻鯊
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Author (Rüppell, 1837) Depth 1 - 80M
Chinese 無溝雙髻鯊 Poisonous Fish No 
Family_Chinese 雙髻鯊科 Economic Fish Yes 
Family F030 Sphyrnidae Edible Fish Yes  Chinese In Mainland China 無溝雙髻鯊 
Max Length 610 cm  Aquarium Fish No  Common Name 無溝丫髻鯊、犛頭沙、雙髻鯊、雙過仔、八鰭丫髻鮫 
Distribution in World global   Distribution in Taiwan East、North、North East、Greeb IS. 
Habitats Ocean、Coral、Benthos、Coastal、
Holotype Locality Massawa, Eritrea, Red Sea 
Synonyms Sphyrna lewini, Sphyrna ligo, Sphyrna mokorran, Sphyrna tudes, Sphyrna zygaena, Zygaena dissimilis, Zygaena mokarran, Zygaena tudes   
Reference 臺灣魚類誌(沈等, 1993);中國動物誌-圓口綱及軟骨魚綱(朱等, 2001);FAO Species Catalogue, Vol.4 Sharks of the world  Schwartz, F.J. etc. 1981 Schwartz, F.J. 1983 Compagno, L.J.V. 1984 Compagno, L.J.V. 1984 沈世傑 編 Shih-Chieh Shen ed. 1993 朱元鼎, 孟慶聞 等編 2001 
Specimen List
Common Name Squat-headed hammerhead shark; Great hammerhead shark; Great hammerhead 
Redlist Status DD IUCN Redlist: Data deficient(DD)  2000-06-30  CITES Appendix 2 CITES Appendix 2 
Characteristic A large hammerhead with an expanded prebranchial head. Head width 23-27% of total length. Anterior margin of head very broadly arched in young but nearly straight in adults, with prominent medial and lateral indentations. Preoral snout less than 1/3 of head width. Anterior teeth moderately long stout cusps, strongly serrated edges, posterior teeth mostly cuspidate and not keeled and molariform. First dorsal fin origin over or slightly behind pectoral insertions, its free rear tip well anterior to pelvic origins. Second dorsal fin height about equal to anal fin, its inner margin about equal to fin height. Anal fin about as large as or larger than 2nd dorsal fin, its base 5.6-7.3% of total length. Total vertebral centra 197-212. Colour grey-brown above, light below, without fin markings.
habitats A coastal-pelagic and semi-oceanic tropical hammerhead. Viviparous, with a yolk-sac placenta. Litter size 13-42. Sex ration of embryos are 1:1. Gestation period estimated to be at least 7 months. Maximum size 550-610 cm. males maturing at 234-269 cm and f 
Distribution Western Atlantic from North Carolina to Brazil, including Gulf of Mexico and Caribbean. Eastern North Atlantic including Morocco, Senegal. Mediterranean. Indo-West Pacific from South Africa and Red Sea to India, Thailand, China, Taiwan, Riu Kyu Islands, A