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L\'influence du recouvrement des cages flottantes par des bâches plastiques noires non transparentes et de la periode (jour ou nuit) de distribution de l\'aliment sur la survie et la croissance du poisson-chat africain Heterobranchus longifilis a ete evaluee. L\'experience a consiste a observer le jour et la nuit des alevins nourris en quatre repas, dans deux types de cages flottantes : cages couvertes et cages non couvertes. Quelle que soit la periode de distribution de l\'aliment, les meilleurs taux de survie ont ete observes dans les cages couvertes (73,0 ± 2,6 % le jour et 75,0 ± 1,7 % la nuit contre 64,0 ± 3,5 % le jour et 67,0 ± 2,0 % la nuit). Les poids moyens finaux des poissons enregistres dans ces cages sont de 16,9 ± 1,9 g le jour et 17,8 ± 1,9 g la nuit. Ces poids sont comparables a ceux observes dans les cages non couvertes avec distribution nocturne de l\'aliment (16,8 ± 1,1 g). Ces resultats montrent qu\'en cages couvertes, la periode de distribution de l\'aliment n\'a aucune influence sur la croissance des poissons. The effects of covering the breeding floating cages with a black plastic canvas and the feeding period (day or night) on the survival and growth of the african cat-fish Heterobranchus longifilis have been investigated. Juvenile individuals of this species fed four times during daytime and nighttime were reared in two types of floating cages : covered with black plastic canvas and without any canvas. Whatever the feeding period, the best survival rates were recorded in covered cages (73,0 ± 2,6 % for daytime and 75,0 ± 1,7 % for nighttime, against 64,0 ± 3,5 % for daytime and 67,0 ± 2,0 % for nighttime). In these cages, final mean weights of fishes recorded were 16,9 ± 1,9 g for daytime and 17,8 ± 1,9 g for nighttime. These data were similar to those recorded in non covered floating cage with nighttime feeding. Results suggest that there is no effect of the feeding period on the growth of H. longifilis reared in cages with canvas. Keywords : Heterobranchus longifilis , alevinage, cage flottante, eclairement, horaires de nourrissage./ Heterobranchus longifilis , fry rearing, floating cage, light, feeding time. Sciences & Nature Vol. 4 (1) 2007: pp. 85-92

sciences and nature. série a, biosciences agronomie environnement biotechnologie

Effets de la couverture des cages flottantes et de la période de distribution de l\'aliment sur la survie et la croissance des alevins du poisson-chat africain &lt;i&gt;Heterobranchus longifilis&lt;/i&gt; Valenciennes 1840 en élevage intensif