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Ichthyological Research

, Volume 62, Issue 4, pp 463–473 | Cite as

Population structure of the piked dogfish Squalus acanthias (Elasmobranchii: Squalidae), with preliminary reproductive observations

  • María Cristina OddoneEmail author
  • Laura Paesch
  • Walter Norbis
Full Paper

Abstract

Squalus acanthias has been poorly studied in Uruguay, though reproductive studies have been carried out in Argentina in the decades of 1970–1980. The aim of this work was to analyze the population structure and the reproductive biology of S. acanthias along the Uruguayan continental shelf (south-western Atlantic Ocean) between 1995 and 2010. Total length (TL) ranged from 30–95 cm for females (n = 1,323) and 25–81 cm for males (n = 999). Significant differences in the TL frequency distributions between sexes and among seasons were detected, with abundances in the magnitude of up to 5,000 individuals/nm2. Length at first maturity (TL50) was 58.3 cm in males and 70.4 cm in females. Ovarian and uterine fecundity were 2–14 and 1–14, respectively, and both were positively correlated with maternal TL. Females with candled embryos were recorded in autumn. Embryo TL was significantly greater in winter, which is when parturition is likely occurring. Full-term embryos had a TL of 22–25 cm. Sex ratio of embryos was close to parity. Ovarian vitellogenesis was observed to be occurring concomitantly with gestation.

Keywords

Size at maturity Piked dogfish Size structure 

Notes

Acknowledgements

The authors are grateful to the crew of RV Aldebarán, the colleagues of DINARA’s Department of Fisheries Biology who collaborated with the sampling onboard. Part of the information contained in this paper belongs to the first author’s degree dissertation.

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Copyright information

© The Ichthyological Society of Japan 2015

Authors and Affiliations

  • María Cristina Oddone
    • 1
    • 3
    Email author
  • Laura Paesch
    • 1
  • Walter Norbis
    • 1
    • 2
  1. 1.Poblational Biology DepartmentNational Direction of Aquatic Resources (DINARA)MontevideoUruguay
  2. 2.Laboratory of Reproduction Physiology and Ecology of Fishes, Animal Biology Department, Faculty of Sciences (FCien)Institute of BiologyMontevideoUruguay
  3. 3.Federal University of Rio Grande (FURG), Biological Sciences InstituteRio GrandeBrazil

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