Environmental Biology of Fishes

, Volume 57, Issue 2, pp 155–170

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

Authors

  • Fabrice Duponchelle
    • ORSTOM, GAMET
  • Philippe Cecchi
    • Programme Petits BarragesORSTOM
  • Daniel Corbin
    • Programme Petits BarragesORSTOM
  • Jesus Nuñez
    • ORSTOM, GAMET
  • Marc Legendre
    • ORSTOM, GAMET
    • ORSTOM, Instalasi Penelitian Perikanan Air Tawar
Article

DOI: 10.1023/A:1007575624937

Cite this article as:
Duponchelle, F., Cecchi, P., Corbin, D. et al. Environmental Biology of Fishes (2000) 57: 155. doi:10.1023/A:1007575624937

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.

seasonallityinter annual variationsreproductive stylefishcichlid
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© Kluwer Academic Publishers 2000