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Marine Biology

, Volume 158, Issue 10, pp 2187–2197 | Cite as

Maturation, fecundity, and spawning strategy of the thornback ray, Raja clavata: do reproductive characteristics vary regionally?

  • Bárbara Serra-Pereira
  • Ivone Figueiredo
  • Leonel Serrano Gordo
Original Paper

Abstract

In Portuguese waters, thornback ray Raja clavata spawns mainly between May and January, although females and males in spawning condition are found throughout the year. The maturation process can be divided into three main phases by using information on gonad weight, oviducal gland and uterus width in females and on gonad weight, clasper length and sperm duct width in males. Females attain length-at-first-maturity at 784 mm and males at 676 mm, at ages of 7.5 and 5.8 years, respectively. In females larger than length-at-first-maturity, a resting stage was identified characterized by low gonadosomatic index and well-developed oviducal glands and uteri. These results along with the low proportion of adult females that are effectively reproducing per month demonstrated that the thornback ray cannot be considered a continuous spawner as described in other studies. Fecundity was determinate with about 35 eggs released per batch. During the spawning season, a total of four batch episodes occur indicating that the total fecundity was approximately 136 eggs per female. Regional differences may exist in the reproductive strategy of the species, namely on the duration of the spawning season, length-at-first-maturity, and fecundity, which can be related to a more intense fishing pressure in northern European waters.

Keywords

Large Follicle Gonad Weight Horn Length Oviducal Gland Portuguese Water 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We would like to acknowledge Teresa Moura, Inês Farias, José Lago, Leonor Costa, Emanuel Pombal, and Paulo Castro from IPIMAR, for helping on sampling. We would like to thank Tom Blasdale for revising the English of the manuscript, and to the anonymous reviewers and editor Myron A. Peck for their valued suggestions for improvement. This study was partially supported by project EU Data Collection/, DCR (PNAB). B. Pereira was funded by the Fundação para a Ciência e a Tecnologia, SFRH/BDD/23777/2005 and by the project framework “Desarrollo sostenible de las pesquerías artesanales del Arco Atlántico” (PRESPO) of the INTERREG IVB Programme—Atlantic Arc (co-funded by the EU, ERDF Programme).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Bárbara Serra-Pereira
    • 1
    • 2
  • Ivone Figueiredo
    • 1
  • Leonel Serrano Gordo
    • 2
  1. 1.Unidade de Recursos Marinhos e SustentabilidadeInstituto Nacional de Recursos Biológicos I.P./IPIMARLisbonPortugal
  2. 2.Centro de Oceanografia, Departamento de Biologia AnimalFaculdade de Ciências de LisboaLisbonPortugal

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