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Higher taxa:  Life   Vertebrata   Fish   Sphyrnidae   Sphyrna   Global map IDnature guides: Fish, Fish_species_NCSM, SFTEP We parsed the following live from the Web into this page. Such content is managed by its original site and not cached on Discover Life. Please send feedback and corrections directly to the source. See original regarding copyrights and terms of use. Taiwan Biodiversity National Information Network FishBase

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© Copyright Photographer/SFTEP, 2002 Sphyrna mokarran	© Copyright Photographer/SFTEP, 2002 Sphyrna mokarran
© Copyright Ross Robertson, 2006 Sphyrna mokarran

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Overview

Main identification features hammer: wide, front straight + slight notch 1st dorsal fin : very tall, pointed, curved 2nd dorsal fin greater than 3rd gill slit A hammerhead shark with broad, narrow-blade side extensions on the head (with of hammer 23-27% of total length); front margin of head nearly straight in adults, with shallow central and side indentations; first dorsal fin very tall and curved, with pointed tip; height of second dorsal fin > length of 3rd gill slit; second dorsal and anal fins with strongly notched rear edges, their bases about equal; pelvics large, with concave rear borders. Grey brown on back and sides, whitish below; no prominent markings on fins. Said to reach 610 cm, but uncommon above 350 cm; size at birth 50-70 cm. A coastal pelagic and semi- oceanic species. Depth range 1-300 m. Circumtropical distribution, in the eastern Pacific from southern Baja California and the Gulf of California to northern Peru, Malpelo and the Galapagos. Attributes Abundance: Common. Cites: Not listed. Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California); Northern Subtropical (Cortez Province + Sinaloan Gap); Northern Tropical (Mexican Province to Nicaragua + Revillagigedos); Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo); South Temperate (Peruvian Province ). Depth Range Max: 300 m. Depth Range Min: 0 m. Diet: octopus/squid/cuttlefish; mobile benthic gastropods/bivalves; sharks/rays; mobile benthic crustacea (shrimps/crabs); bony fishes. Eastern Pacific Range: Northern limit=32; Southern limit=-15; Western limit=-115; Eastern limit=-73; Latitudinal range=47; Longitudinal range=42. Egg Type: Live birth; No pelagic larva. Feeding Group: Carnivore. FishBase Habitat: Pelagic. Global Endemism: Circumtropical ( Indian + Pacific + Atlantic Oceans); East Pacific + Atlantic (East +/or West); Transisthmian (East Pacific + Atlantic of Central America); East Pacific + all Atlantic (East+West); TEP non-endemic; West + East Pacific (but not Central); "Transpacific" (East + Central &/or West Pacific); All species. Habitat: Water column; Reef associated (reef + edges-water column & soft bottom); Reef (rock &/or coral); Reef and soft bottom; Corals; Soft bottom (mud, sand,gravel, beach, estuary & mangrove). Inshore Offshore: Inshore; Offshore; In & Offshore. IUCN Red List: Data deficient; Listed. Length Max: 610 cm. Regional Endemism: Island (s); Continent; Continent + Island (s); Eastern Pacific non-endemic; Tropical Eastern Pacific (TEP) non-endemic; All species. Residency: Resident. Salinity: Marine; Marine Only. Water Column Position: Mid Water; Near Bottom; Bottom;

Names

Scientific source:       Integrated Taxonomic Information System

Links to other sites

Fishbase Catalog of Fishes Integrated Taxonomic Information System

References

Béarez, P., 1996., Lista de los Peces Marinos del Ecuador Continental., Revista de Biologia Tropical, 44:731-741. Castri-Aguirre, J.L., Espinoza-Pérez, H. and Schmitter-Soto, J.J., 2002., Lista sitemática, biogeográfica y ecológica de la ictiofauna estuarino lagunar y vicaria de México. En: Lozano-Vilano, M. L. (Ed.). Libro Jubilar en Honor al Dr. Salvador Contreras Balderas., Universidad Autonoma de Nuevo León:117-142. Castro-Aguirre, J.L., 1999., Ictiofauna estuarino-lagunar y vicaria de México., Editorial Limusa S.A. de C.V.: 1-629pp. Compagno, L.J.V., 1999., Checklist of living elasmobranchs. In Hamlett W.C. (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes., The John Hopkins University Press:471-498. Compagno, L.J.V., 1984., Sharks of the World. An annotated and illustrated catalogue of shark species known to date. Part 2. Carcharhiniformes. FAO Species Catalogue., FAO Fish. Synop. No 125, 4(2):251-655. Findley, L.T., Hendrickx, M.E., Brusca, R.C., van der Heiden, A.M., Hastings, P.A., Torre, J., 2003., Diversidad de la Macrofauna Marina del Golfo de California, Mexico., CD-ROM versión 1.0. Projecto de la Macrofauna del Golfo .  Derechos reservados de los autores y Conservación Internacional. Fischer , W. , Krup , F. , Schneider , W. , Sommer , C. , Carpenter , K. E. and Niem, V. H., 1995., Guia FAO para la Identificacion de Especies de para los fines de la Pesca. Pacifico Centro-Oriental. Volumen II. Vertebrados - Parte 1., FAO2:647-1200. Galván-Magaña, F., Gutiérrez-Sánchez, F., Abitia-Cárdenas, L.A., Rodríguez-Romero, J., 2000., The distribution and affinities of the shore fishes of the Baja California Sur lagoons. In Aquatic Ecosystems of Mexico: Status and Scope. Eds. M. Manuwar, S.G. Lawrence, I.F. Manuwar & D.F. Malley. Ecovision World Monograph Series., Backhuys Publishers:383-398. Jimenez-Prado, P., Béarez, P., 2004., Peces marinos del Ecuador continental / Marine fishes of continental Ecuador., SIMBIOE/NAZCA/IFEA tomo 1 y 2. Lopez , M. I. and Bussing, W. A., 1982., Lista provisional de los peces marinos de la Costa Rica., Revista de Biologia Tropical, 30(1):5-26. Love, M.S., Mecklenburg, C.W., Mecklenburg, T.A., Thorsteinson, L.K., 2005., es of the West Coast and Alaska: a checklist of North Pacific and Artic Ocena species from Baja California to the Alaska-Yukon border., U.S. Department of the Interior, U.S. Geological Survey, Biological Resources Division, 288pp. Ramírez Rodríguez, M., 1997., Producción pesquera en la Bahía de La Paz, B.C.S.. En Urbán Ramírez, J. y M. Ramírez Rodríguez (Eds.). La Bahía de La Paz investigación y conservación., Universidad Autónoma de Baja California Sur:273-282. Rubio, E.A., 1986., Notas sobre la ictiofauna de la Isla de Gorgona, Colombia., Boletin Ecotropica. Univ. Bog. Jorge Tadeo Lozano, 13:86-112. Rüppell, W. P. E. S., 1837., Neue Wirbelthiere zu der Fauna von Abyssinien gehörig., Fische des Rothen Meeres, 1837:53-80. Snodgrass , R. E. and Heller, E., 1905., Papers from the Hopkins Stanford Galapagos expedition, 1898-1899. XVII. Shorefishes of the Revillagigedo, Clipperton, Cocos and Galapagos Island., Proc. Wash. Acad. Sci., 6:333-427. Van der Heiden , A. M. and Findley, L. T., 1988., Lista de los peces marinos del sur de Sinaloa, México., Anales del Centro de Ciencias del Mar y Limnologia de la Universidad Autonoma Nacional de Mexico, 15:209-224. Villavicencio Garayzar , C. J. , Mariano Meléndez , E. and Downton Hoffmann, C., 1997., Tiburones capturados comercialmente en la Bahía de La Paz, B.C.S.. En Urbán Ramírez, J. y M. Ramírez Rodríguez (Eds.). La Bahía de La Paz investigación y conservación., Universidad Autónoma de Baja California Sur:201-236.

Acknowledgements

Ross Robertson, Smithsonian Tropical Research Institute I thank Ashley MacDonald and John Pickering, University of Georgia, for technical support in building this page.