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Reproduction of the pelagic thresher shark Alopias pelagicus in the equatorial Pacific

Published online by Cambridge University Press:  14 July 2014

A.F. Romero-Caicedo ,
F. Galván-Magaña  and
J. Martínez-Ortiz
A.F. Romero-Caicedo
Affiliation:
Departamento Central de Investigación, Universidad Laica Eloy Alfaro de Manabí, Ciudadela Universitaria via San Mateo, Manta, Manabí, Ecuador
F. Galván-Magaña*
Affiliation:
Centro Interdisciplinario de Ciencias Marinas, Avenida I. P. N. s/n, Colonia Playa Palo de Santa Rita, Apartado Postal 592, C.P. 23000, La Paz, Baja California Sur, México
J. Martínez-Ortiz
Affiliation:
Subsecretaría de Recursos Pesqueros, Avenida 4 Calle 12-13, Manta, Manabí, Ecuador
*
Correspondence should be addressed to: F. Galván-Magaña, Centro Interdisciplinario de Ciencias Marinas, Avenida I. P. N. s/n Colonia Playa Palo de Santa Rita, Apartado Postal 592, C.P. 23000, La Paz, Baja California Sur, México email: [email protected]
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Abstract

The reproductive biology of the pelagic thresher shark Alopias pelagicus, was analysed based on 241 individuals (101 males and 140 females). Samples were collected from April 2005 to February 2006, from the artisanal fishery in Manta, Ecuador. Males ranged from 68 to 183 cm precaudal length (PL); females ranged from 70 to 180 cm PL. In embryos, sexual proportion was 1F:1M; while in adults the proportion was 1.4F:1M, which suggests sexual segregation in maturing individuals. We showed differences in the development of reproductive structures according to the reproductive condition, and in males the size at maturity occurs at 144.3 cm PL and in females at 151.4 cm PL. We recorded 33 pregnant females that presented one embryo in each uterus in different developmental stages. The results of this study provide information on reproduction of the species that will help to establish an appropriate fisheries management.

Keywords

reproductive biologymaturitysexual segregationreproductive cycle
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 7 , November 2014 , pp. 1501 - 1507
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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