Aspects qualitatifs et quantitatifs de l’alimentation de Clarias buettikoferi (Siluriformes ; Clariidae) dans la forêt des marais Tanoé-Ehy (Côte d’Ivoire)
Qualitative and quantitative traits of the diet of Clarias buettikoferi (Siluriformes; Clariidae) in the Tanoe-Ehy swamp forest (Côte d’Ivoire)
Feeding habits of the catfish Clarias buettikoferi Steindachner, 1894 were studied in the Tanoe-Ehy swamp forest (Côte d’Ivoire). Fishes were caught monthly using fyke nets and gillnets from March 2012 to February 2013. 208 fishes were collected, with standard length and weight ranging between 90 and 260 mm, and 7.3 and 132 g, respectively. Mean vacuity index (VI) was 14.4%. The seasonal average of VI was 40.4% and 8.4% for dry and rainy seasons, respectively. A total of 41 food items was recorded, including animals and vegetables. Main Food Index showed that insects were the principal prey category. Macrophytes were the secondary item, while mollusks, myriapods, crustaceans and arachnids were accessory prey. C. buettikoferi exhibited an omnivorous feeding behaviour with an insectivorous tendency. Significant variation of the diet was observed between seasons, showing different feeding behavior (pelagic or benthic feeding habits). C. buettikoferi is an opportunistic feeder, which mainly feeds on pelagic and floating insects during rainy months, while in dry season the preferential food items included mollusks and other benthic food resources.