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Reproductive biology of pollack (Pollachius pollachius) from the Galician shelf (north-west Spain)

Published online by Cambridge University Press:  10 April 2013

Alexandre Alonso-Fernández ,
David Villegas-Ríos ,
Marta Valdés-López ,
Beatriz Olveira-Domínguez  and
Fran Saborido-Rey
Alexandre Alonso-Fernández*
Affiliation:
Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
David Villegas-Ríos
Affiliation:
Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
Marta Valdés-López
Affiliation:
Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
Beatriz Olveira-Domínguez
Affiliation:
Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
Fran Saborido-Rey
Affiliation:
Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain
*
Correspondence should be addressed to: A. Alonso-Fernández, Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Científicas, IIM-CSIC, c/ Eduardo Cabello 6, 36208 Vigo (Pontevedra), Spain email: alex@iim.csic.es
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Abstract

The pollack, Pollachius pollachius, is an important commercial species for the Spanish artisanal fleet in Atlantic Iberian waters. This study provides information on the reproductive biology of the species, including length at maturity, reproductive cycle and gamete development pattern based on histological methods. A collection of 622 individuals were sampled from fish markets along the western coast of Galicia (NW Spain), between November 2009 and October 2010. Histological examination of the gonads revealed an asynchronous development of secondary growth follicles. Testicular tissue was of lobular type. The reproductive season extended from January to April for females and from January to May for males, with a peak of reproductive activity in February for both sexes. The hepatosomatic index was related to the reproductive cycle, with a mean maximum value during the developing reproductive phase. Length at 50% maturity was significantly different between females (47.1 cm) and males (36.1 cm).

Keywords

reproductive biologycondition indicesgamete developmentreproductive cycleatresialength at maturityPollachius pollachiusnorth-west Spain
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 7 , November 2013 , pp. 1951 - 1963
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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