Ontogenetic migration of a female scalloped hammerhead shark Sphyrna lewini in the Gulf of California

E. Mauricio Hoyos-Padilla, James T. Ketchum, A. Peter Klimley and Felipe Galván-Magaña

 

Animal Biotelemetry, 2014, 2:17.

 

DOI: https://doi.org/10.1186/2050-3385-2-17

 

Abstract

 

Our study documents a female scalloped hammerhead shark changing life history phases from a nursery-inhabiting juvenile inshore to a migratory sub-adult offshore. We also infer that this shark swam within a school of conspecifics at an offshore island or seamount during the day, and migrated away at night, diving to greater depths to feed on mesopelagic prey. We show that this female shark carried out her complete biological cycle in both coastal and offshore areas of the central and southwestern Gulf of California, suggesting maximization of foraging opportunities and continued growth. In this study, we provide evidence for the first time of an ontogenetic migration of a juvenile scalloped hammerhead shark in the Gulf of California, which could be of great significance for the regional management and conservation of sharks in the Gulf of California.

 

Keywords

 

Ontogeny, movements, archival tag, hammerhead shark, Gulf of California

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