Evidence of perturbations induced by reproduction on somatic growth and microincrement deposition in Oreochromis niloticus otoliths
2004
Massou, A.M. | Panfili, Jacques | Le Bail, Pierre-Yves | Laë, Raymond | Mikolasek, O. | Fontenelle, Guy | Baroiller, Jean-François | Institut National de Recherches Agronomiques du Niger [Niamey] (INRAN Niamey) | Institut de recherche pour le développement [Dakar, Sénégal] (IRD Hann Maristes) | Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement (SCRIBE) ; Institut National de la Recherche Agronomique (INRA) | GAMET, IRD, UR081 (GAMET) | Ecole Nationale Supérieure Agronomique de Rennes
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Show more [+] Less [-]English. The direct effects of reproduction (energy expenditure for gametogenesis) were studied in gonadectomized Oreochromis niloticus females, incapable of reproducing. The indirect effects of reproduction were studied in intact females that had either mouth brooded their eggs or not. In gonadectomized females the slowing of growth observed in the marginal zone of their otoliths coincided with the time of gonad regeneration. The responses were very varied in the group of intact females. In these females, there was less otolith growth and more checks were observed on the otoliths. The results showed that reproduction influenced the growth of fish and their otoliths leading to a significant underestimate of the number of primary increments during this period of life.
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