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Journal of Ichthyology

, Volume 54, Issue 1, pp 111–126 | Cite as

Production, maturity, reproductive cycle and fecundity of small-spotted catshark, Scyliorhinus canicula (Chondrichthyes: Scyliorhinidae) from the northern coast of Tunisia (Central Mediterranean)

  • C. Capapé
  • N. Mnasri-Sioudi
  • O. El Kamel-Moutalibi
  • M. Boumaïza
  • M. M. Ben Amor
  • C. Reynaud
Article

Abstract

Small-spotted catshark Scyliorhinus canicula (Linnaeus, 1758) is confronted since 2000 to a drastic decline of captures in Tunisian northern areas where it formerly was quantitatively and qualitatively very abundant. A study conducted in the area showed that males and females sexually matured between 400–478 mm and 364–471 mm total length (TL), respectively. The largest male and female were 521 mm and 531 mm TL, respectively and weighed 449 and 445.5 g, respectively. There was a not significant relationship total mass vs. TL between males and females. Conversely, the relationship of liver mass vs. TL significantly differed between sexes. Both HSI and GSI values did not present significant differences between males and females. There was a not significant relationship total mass vs. TL between males and females. Both male and female HSI reached high values in adults, significantly higher than those of sub-adults. Both male and female GSI values increased with TL of specimens; additionally, they showed significant differences between juveniles and sub-adults and also between sub-adults and adults. The OSI values were significantly different between juvenile and sub-adult females, and also between sub-adult and adult females. Monthly mean values of adult male and female HSI did not significantly vary throughout the year. Significant monthly changes were recorded in mean values of adult male however no significant changes were observed in monthly mean of GSI and OSI for adult females. Vitellogenic activity and production of egg cases permanently occurred throughout the year. The diameter of largest yolky oocytes ranged from 20.1 to 23.0 (mean = 21.43 ± 1.07) and weighed from 0.64 to 0.90 g (mean = 0.78 ± 0.09). Some measurements were taken on egg cases: length with horns ranged 42.5-55.7 mm with mean = 48.9 ± 2.9, width ranged 13.6–19.7 mm with mean = 16.50 ± 0.9, while the total mass of complete egg case ranged between 1.8 and 4.6 g, with mean = 2.4 ± 0.4. An annual fecundity estimation based on production of egg cases and oocytes during one year counted in adult females, enabled us to consider it between 40 and 240.

Keywords

reproduction relationships total length vs. total mass and liver mass hepato gonosomatic and oviduco somatic indexes egg cases 

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • C. Capapé
    • 1
  • N. Mnasri-Sioudi
    • 2
  • O. El Kamel-Moutalibi
    • 2
  • M. Boumaïza
    • 2
  • M. M. Ben Amor
    • 3
  • C. Reynaud
    • 4
  1. 1.Laboratoire d’Ichtyologie, case 104Université Montpellier II, Sciences et Techniques du LanguedocMontpellier cedex 5France
  2. 2.Laboratoire de Bio-Surveillance de l’EnvironnementUnité d’Hydrobiologie Littorale et Limnique Université de Carthage, Faculté des SciencesZarzouna, BizerteTunisia
  3. 3.Institut National des Sciences et Technologies de la MerLa GouletteTunisia
  4. 4.Laboratoire Interdisciplinaire de Recherche sur la DidactiqueUniversité Montpellier II, Sciences et Techniques du LanguedocMontpellier cedex 5France

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