Labeo senegalensis, Oueme river; fecundity, population structure; reproduction, sex ratio
Abstract :
[en] Aspects of the reproductive biology and population structure of Labeo senegalensis were investigated in the Ouémé River between April 2005 and March 2006. Reproductive strategy was investigated using gonadosomatic index,ovarian structure and fecundity. Average size-at-first-maturity (L 50) was estimated at 29 cm TL for females and 26,7 cm TL for males. The average sex ratio (1:0,96) was not significantly different from unity. Oocyte diameter frequency distribution suggests synchronous development with a single total spawning. Absolute fecundity ranged between 12 948 and 74 832 eggs. Labeo senegalensis is a highly fecund fish that presents a seasonal cycle of reproduction from May to October during the rainy season.
Montchowui, Elie; University of Abomey-Calavi, Cotonou, Republic of Benin > Lab of Hydrobiology and Aquaculture
Laleye, Philippe; University of Abomey-Calavi, Calavi, Republic of Benin > Lab. of Hydrobiology and Aquaculture
Philippart, Jean-Claude ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale
Poncin, Pascal ; Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale
Language :
English
Title :
Reproductive strategy of Labeo senegalensis Valenciennes, 1842 (Teleostei: Cyprinidae) in the Ouémé basin, Bénin.
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