, Diets, Synodontis membranaceus, Ikere Gorge, Stomach


Natural dietary items in the stomach of Synodontis membranaceus from Ikere Gorge in Oyo State, Nigeria were investigated between the months of October to December 2004 and June to August 2005. Fish species were obtained from fishermen every fortnight using gill net and cast net. Specimens were chilled with iced blocks at the point of collection and transported to the laboratory. 642 fish specimens were examined and their stomach contents analysed. Frequency of occurrence and numerical methods were employed in the study. The result of the analysis showed that the food items found covered a wide spectrum, ranging from various types of planktons to invertebrates and plants. A seasonal variation was also noted in the stomach contents of S. membranaceus over the period of study. The predominant food items found in the stomach were Polycytis spp, Closterium spp, Oedogonium spp., plant tissues, insect parts, paramecium sp., unidentified algae and detritus. This suggests that S. membranaceus is an omnivore.


Adebisi, A.A. 1981. Analysis of the stomach contents of the piscivores fishes of the upper Ogun River in Nigeria. Hydrobiologia 79: 167- 177.

Adebisi, A. A. 1978. Studies on the ecology, growth and reproduction of the fishes of upper Ogun river of Nigeria. Ph.D. Thesis, University of Ibadan, Ibadan.

Adeosun F.I. 2007. Bio-ecology of the fish fauna of Ikere gorge in Oyo State Nigeria, Ph. D. Thesis, University of Agriculture Abeokuta, Ogun State. 36 pp.

Arawomo, G.A.O. 1976. Food and feeding of three Citharinus species in Lake Kainji, Nigeria. J. Fish Biol. 9:3-10. Bagenal, T. 1978. Methods for assessment of fish production in fresh waters. Blackwell Scientific Publications, Oxford.

Bagenal, T. B., F.W. Tesch 1978. Age and Growth. In: Methods of Assessment of fish production in freshwaters. (Bagenal, ed.) Oxford, Blackwell Scientific Publications.
Crisp, D.P., R. H. K. Mann and J. C. McCormack. 1978. The effects of impoundment and regulation upon the stomach contents of fish at Cowgree, upper Teesdale. J. fish Biol. 12:287-301.

Dunn, D.R. 1959. The feeding habits of some of the fishes and some members of the vottom fauna of Llyn Tegid (Bala Lake). Merionethshire. J. Anim. Ecol. 23:224-233.

Elliot, O.O. 1986. Some aspects of the biology of the fishes of Asejire Lake. Ph.D. Thesis. University of Ibadan. Oyo State. Nigeria. Pp 155.

Fagade, S.O. 1978. The Biology of Tilapia guineensis (Dumeril) from the Lekki Lagoon, Lagos State, Nigeria. Nig. J. Sc. 12:73-83.

Fagade, S.O., Olaniyan, C.I.O. 1972. The biology of the West African shad, Ethmalosa fimbrata (Bowditch) in the Lagos Lagoon, Nigeria. J. Fish Biol., 4:519-533.

Fagade, S. O., Olaniyan, C. I. O. 1973. The food and feeding habits of Tilapia species in the Lagos lagoon. J. Fish Biol. 3: 151-156.

Hynes, H.B.N. 1950. The food of freshwater sticklebacks (Gasterosteus aculeatus and Pygosteus pungitus) with a review of methods used in the studies of the food of fishes. J. Ani. Ecol., 19: 36-58pp.

Hyslop, E.J. 1980. Stomach contents analysis – a review of methods and their application. J. Fish Biol., 17: 411-429.

Moss, B. 1980. Ecology of fresh waters. Blackwell Scientist Publication, Oxford. 17pp.

Olurin, K.B. 1994. Ecology of feeding, reproduction and growth of the fisheries in Oyan lake, Abeokuta, Ogun State, Nigeria. Ph.D. Thesis, University of Ibadan, Ibadan. 270pp.

Owolabi, O.D. 2005. Some aspects of the Biology of Synodontis membranaceus (Geoffrey Saint Hillarie, 1809) in Jebba Lake, Nigeria. Ph.D. Thesis, University of Ilorin, Nigeria.

Patrick-Dempster., Mallon, P.G.M.,. Beveridge, D.B. 1993. Production de peces herbivoros en sistemas semi intensive. In: XII Reunion Asso, Latino- Americana de production animal, Santiago de Chile. P. 224-246.

Welcomme, R.L. 1983. River Basin FAO Fisheries Technical Paper No. 202 Rome. P.60.






Original Manuscript