Environmental Biology of Fishes

, Volume 57, Issue 2, pp 155–170 | Cite as

Variations in Fecundity and Egg Size of Female Nile Tilapia, Oreochromis niloticus, from Man-made Lakes of Côte D'Ivoire

  • Fabrice Duponchelle
  • Philippe Cecchi
  • Daniel Corbin
  • Jesus Nuñez
  • Marc Legendre
Article

Abstract

Fecundity and oocyte size of Oreochromis niloticus females were studied over a period of two annual cycles in six small agropastoral and three large hydroelectric reservoirs of Côte d'Ivoire. Important differences in fecundity and oocyte size were observed among populations and within the same population between successive years. An inverse correlation was found between size and number of oocytes produced by females. This inverse relationship occurred for a constant spawn weight during the first year of study, but not during the second year. Monthly mean residuals of regressions between fecundity and female body weight have shown a seasonal variation in fecundity. The peak of fecundity corresponded with the maximum resource availability and the flooding eminence, which may have a great impact on parents and offspring fitness.

seasonallity inter annual variations reproductive style fish cichlid 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Fabrice Duponchelle
    • 1
  • Philippe Cecchi
    • 2
  • Daniel Corbin
    • 2
  • Jesus Nuñez
    • 1
  • Marc Legendre
    • 1
    • 3
  1. 1.ORSTOM, GAMETMontpellier Cedex 1France
  2. 2.Programme Petits BarragesORSTOMCôte d'Ivoire
  3. 3.ORSTOM, Instalasi Penelitian Perikanan Air TawarJakartaIndonesia

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