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La reproduction du poisson-chat Synodontis schall a ete etudiee en milieux lacustre et fluviatile, respectivement dans les rivieres Bia et Agnebi. Le caractere permanent de l\'eau, dans le lac a favorise une plus grande periode de reproduction de l\'espece dans la retenue, contrairement aux zones fluviatiles sujettes a des tarissements reguliers. Synodontis schall se reproduit dans le lac, d\'avril a juin, puis d\'octobre a novembre. Dans la riviere Agnebi et les parties fluviatiles de la Bia, l\'espece se reproduit seulement pendant un a deux mois (avril a mai). La taille de premiere reproduction du poisson, le taux de maturation des gonades et la fecondite ont ete significativement plus eleves dans le lac qu\'en milieux lotiques. Une analyse canonique (CANOCO), tenant compte a la fois des parametres de la reproduction du poisson ainsi que des facteurs physico-chimiques des milieux etudies, confirme que la reproduction et la croissance de l\'espece ont etenettement meilleures en milieu lacustre que dans les cours d\'eau. A catfish breeding study ( Synodontis schall ) has been carried in lacustrin and fluviatile environments in Bia and Agnebi rivers, respectively. Water permanency in the lake favored a longer breeding season of this fish in the dam than in the river parts, where drought occurs frequently. Spawning season of the fish occured from april to june and from october to november in the lake. In the other study areas, the spawning ran just in one or two months (april to may). First maturity size, gonad maturity rate and fecundity are significantly higher in the lake than in the other water bodies studied. A canonical analysis (CANOCO), which takes into account both reproductive and environmental parameters, shown that the reproduction and the growth of Synodontis schall was better in the lake than in the running streams. Keywords : Reproduction, Synodontis schall , lac, riviere, Cote d\'Ivoire. Agronomie Africaine Vol. 17 (3) 2005: pp. 241-253

agronomie africaine

Stratégies de reproduction du poisson-chat &lt;i&gt;Synodontis schall&lt;/i&gt; (Bloch Schneider, 1801) (Siluriformes, Mochokidae) en milieux lacustre et fluviatile (bassins Bia et Agnébi, Côte d\'Ivoire)