PROMOTING ACCESS TO AFRICAN RESEARCH

African Journal of Aquatic Science

Log in or Register to get access to full text downloads.

Remember me or Register



DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

Diet of catfish Clarias buthupogon Sauvage, 1879 (Clariidae) in two rivers in the Yoko Reserve, Tshopo Province, Democratic Republic of the Congo

R.B. Mahamba, J.N. Ndjaki, A.B. Kankonda, J-C Micha

Abstract


The diet of the catfish, Clarias buthupogon, was studied in two forest rivers in the Yoko Reserve, the Yoko and Biaro Rivers, from September 2008 to August 2009. Gill nets, long lines and traditional traps were used to catch the fish. An analysis of the contents of 409 stomachs yielded 22 prey Families, 11 Orders and 4 Classes, grouped into 15 major food categories. Indices of weight and volumetric occurrences indicated that Clarias buthupogon eats aquatic insects, crustaceans, oligochaetes, molluscs, animal and plant debris. The average intestinal coefficient was 0.84, which places the species among the insectivorous-prone omnivores. The diet according to sex, season, length and height, and location inside and outside the Yoko Reserve revealed that similar prey items were consumed in similar proportions. The calculated Schöner Index indicates an overlap of diet between seasons and sex.

Keywords: catfish, intestinal coefficient, Schöner Index, stomach contents, tropical rivers, volumetric index, weight percentage




AJOL African Journals Online