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Reproductive biology of the banded guitarfish, Zapteryx exasperata, from the Gulf of California, México

Published online by Cambridge University Press:  05 August 2009

María-Del-Pilar Blanco-Parra ,
J. Fernando Márquez-Farías  and
Felipe Galván-Magaña
María-Del-Pilar Blanco-Parra*
Affiliation:
Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, circuito exterior s/n, Ciudad Universitaria, México D.F. C.P. 04510, México
J. Fernando Márquez-Farías
Affiliation:
Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Paseo Claussen s/n, Col. Los Pinos, Mazatlán, Sinaloa, México Centro Regional de Investigación Pesquera de Mazatlán, Instituto Nacional de Pesca, Calzada Sábalo–Cerritos, s/n, Mazatlán, Sinaloa, C.P. 82010, México
Felipe Galván-Magaña
Affiliation:
Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, Avenida Politécnico Nacional s/n, Col. Playa Palo de Santa Rita, La Paz, B.C.S.México
*
Correspondence should be addressed to: M.D.P. Blanco-Parra, Centro Interdisciplinario de Ciencias Marinas, Instituto, Politécnico Nacional, Avenida Politécnico Nacional s/n, Col. Playa Palo, de Santa Rita La Paz, B.C.S.México email: [email protected]
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Abstract

The banded guitarfish, Zapteryx exasperata, is a common species in the artisanal elasmobranch fisheries in the Gulf of California. Fishery-derived specimens were examined to determine critical aspects of the reproductive biology of this poorly known group of rays. Two functional testes and ovaries were found in males and females respectively. Median size at maturity (L50%) for males was 64 cm total length (TL) and for females 69 cm TL. Average length of gravid females was 78.8±3.8 cm TL. Histological analysis showed no evidence of sperm storage in the oviducal gland. Gestation was estimated to occur over a five to six month period (February–July) and was concurrent with vitellogenesis. Mean uterine fecundity was estimated as 7 (range 2–13, SD. = 3). The sex-ratio of embryos was 1:1. The reproductive cycle for Z. exasperata from the Gulf of California was estimated to last one year with parturition, ovulation and copulation occurring during the summer months. Differences found in the reproductive cycle of Z. exasperata between the Gulf of California and the west coast of Baja California could have implications in the future management plans for this fishery in the Gulf of California.

Keywords

Rhinobatidaereproductive cyclesize at maturityfisheries management
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 8 , December 2009 , pp. 1655 - 1662
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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