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New report of malformations in blue shark embryos (Prionace glauca) from the western coast of Baja California Sur, Mexico

Published online by Cambridge University Press:  10 April 2018

Jesús Rodriguez-Romero ,
Antonio Simeón-de la Cruz ,
María Ruth Ochoa-Díaz  and
Pablo Monsalvo-Spencer
Jesús Rodriguez-Romero
Affiliation:
Centro de Investigaciones Biológicas del Noroeste, S.C. Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S. CP.23096, México
Antonio Simeón-de la Cruz
Affiliation:
Centro de Investigaciones Biológicas del Noroeste, S.C. Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S. CP.23096, México
María Ruth Ochoa-Díaz*
Affiliation:
Centro de Investigaciones Biológicas del Noroeste, S.C. Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S. CP.23096, México
Pablo Monsalvo-Spencer
Affiliation:
Centro de Investigaciones Biológicas del Noroeste, S.C. Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S. CP.23096, México
*
Correspondence should be addressed to: M. R. Ochoa-Díaz, Centro de Investigaciones Biológicas del Noroeste, S.C. Av. Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz, B.C.S. CP.23096, México email: mrochoa@cibnor.mx
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Abstract

Four new malformations observed in blue shark embryos in the western coast of Baja California Sur, Mexico are reported in this study. The embryos of blue shark samples were obtained on board the industrial fishing boat ‘Damasta’; the organisms were frozen and transferred to CIBNOR Fish Ecology Laboratory where the corresponding measurements were taken and malformations observed. The first malformation was the presence of one nostril in two female embryos that showed short and crushed snouts. The second one was observed in a female with two jaws and the middle portion of the column trunk in screw-shape. The third one was an embryo with dicephaly, two separate vertebral columns, two first dorsal fin pairs, absence of the second dorsal fin, five pelvic fins and two joint caudal fins. The fourth malformation observed was an embryo with incomplete development and undifferentiated sex. Malformations are still a mystery and also an object of study because they affect different organisms, not only sharks but also fish. It is highly relevant to know the causes and perform further studies to understand if the origin is either genetic or anthropogenic.

Keywords

Blue sharkdicephalytwo jawsnostrilwestern coast of Baja California Sur
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 99 , Issue 2 , March 2019 , pp. 497 - 502
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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