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Reproductive biology of the scalloped hammerhead (Sphyrna lewini) in the central-eastern Pacific Ocean

Published online by Cambridge University Press:  11 March 2021

Colombo Estupiñán-Montaño Open the ORCID record for Colombo Estupiñán-Montaño [Opens in a new window] ,
Maribel Carrera-Fernández  and
Felipe Galván-Magaña
Colombo Estupiñán-Montaño*
Affiliation:
Fundación Alium Pacific, Carrera 26 No. 5C–13, Santiago de Cali, Valle del Cauca, Colombia
Maribel Carrera-Fernández
Affiliation:
Facultad de Ciencias del Mar, Universidad Laica “Eloy Alfaro” de Manabí, Avenida Circunvalación, Vía a San Mateo, Manta, Manabí, Ecuador
Felipe Galván-Magaña
Affiliation:
Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Avenida Instituto Politécnico Nacional s/n., Colonia Playa Palo de Santa Rita, 23096 La Paz, Baja California Sur, México
*
Author for correspondence: Colombo Estupiñán-Montaño, E-mail: [email protected]
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Abstract

There are limited data regarding the reproductive biology of the scalloped hammerhead (Sphyrna lewini) in Ecuadorian waters, which limits the development of appropriate management measures of its populations. A total of 1664 S. lewini specimens were recorded in Manta, Ecuador in 2003–2009. Specimens were caught by local commercial fisheries and measured between 50–310 cm total length (TL). Females were more frequently caught, with a sex ratio of 1M:1.8F. The median size at maturity was 178.1 cm TL for males and 219.4 cm TL for females, which was larger compared with other localities. Gravid females, which measured 246–298 cm TL, contained 16–22 embryos. Embryos, which were observed from October–July, measured between 11.1–54.6 cm TL and the available data agreed with a gestation period of 10–11 months that starts in September and ends in June/July. Size at birth was 47–55 cm TL. Sampling data indicated that most fishing activity occurred in nearshore and around seamounts in the central-eastern Pacific Ocean, with much of the landed catch comprising immature individuals. This study documents the reproductive biology of S. lewini in the central-eastern Pacific Ocean and provides additional information to improve management and conservation measures for this species.

Keywords

Birth sizeEcuadorgestation periodhammerhead sharkssize at maturity
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 101 , Issue 2 , March 2021 , pp. 465 - 470
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of Journal of the Marine Biological Association of the United Kingdom

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