Aquatic Ecology

, Volume 44, Issue 1, pp 301–308 | Cite as

Stomach content analysis of juvenile, scalloped hammerhead shark Sphyrna lewini captured off the coast of Mazatlán, Mexico

  • Yassir Edén Torres-RojasEmail author
  • Agustín Hernández-Herrera
  • Felipe Galván-Magaña
  • Vanessa Guadalupe Alatorre-Ramírez


We quantified the diet of juvenile, scalloped hammerhead shark Sphyrna lewini in the area off Mazatlan, Sinaloa, Mexico, to understand their feeding ecology this shark. The prey species of Sphyrna lewini were identified and quantified from stomach content analysis. In addition, we determined the variations between genders. During two fishing seasons (2000–2001 and 2001–2002), we analyzed 232 stomachs, of which 85% contained food. The trophic spectrum was composed of three species of cephalopods, six of crustaceans and 19 species of fish from mainly pelagic and benthic habitats. According to the Index of Relative Importance (%IRI), the cephalopod Loliolopsis diomedeae with IRI = 18%, fish of the family Carangidae IRI = 25% and family Synodontidae IRI = 19% constituted the main prey in general. The trophic niche width was <0.4, which indicated that S. lewini juveniles in this area feed on a wide range of prey items, though they showed a preference for a few prey items.


Feeding habits Specialist Elasmobranchs Gulf of California Mexico 



The authors would like to thank CONACyT, PIFI—IPN, COFAA, and EDI—IPN for the financial support and the Fish Ecology Laboratory at CICIMAR-IPN for its assistance in the identification and analysis of samples. Thanks to Dr. Ellis Glazier for editing this English-language text.


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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Yassir Edén Torres-Rojas
    • 1
    Email author
  • Agustín Hernández-Herrera
    • 1
  • Felipe Galván-Magaña
    • 1
  • Vanessa Guadalupe Alatorre-Ramírez
    • 1
  1. 1.Centro Interdisciplinario de Ciencias Marinas (CICIMAR-IPN)La PazMéxico

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