The Food and Feeding Ecology of Nile Tilapia, Oreochromis niloticus, in Lake Hayq, Ethiopia

Workiyie Worie Assefa, Abebe getahun

Abstract


We investigated the food and feeding habits of Nile tilapia, Oreochromis niloticus, in Lake Hayq, Ethiopia from August 2008 to March 2009. A total 931 fish were collected by gillnets of various stretched mesh sizes, of which 326 individuals of Oreochromis niloticus stomachs contained food. The stomach contents were analyzed using frequency of occurrence, numerical methods and the Geometric Index of Importance (GII). The food items in the stomach covered a wide variety, ranging from various types of phytoplankton to zooplankton and to macrophytes. The major food items in terms of frequency of occurrence were Microcystis (87.7%), Cosmarium (65.13%), Navicula (64.2%) and Daphnia (71%) genera. Numerically, Cosmarium (38.5%) and Microsystis (31%) dominated the food of O. niloticus. However, Geometric Importance Index GII suggested that the most consumed group was Microcystis (83.93%). A monthly variation was also noted in the stomach contents of O. niloticus over the period of investigation. The food composition of O. niloticus showed slight variation among fish size. The contribution of zooplankton (Daphnia and Keratella) tended to increase with decreasing size of the fish, but Copepoda (Thermocyclops) tended to increase with size. Size based difference is also supported by one-way analyses of similarities (ANOSIMs) and the difference is mainly due to the differences in the importance of green algae (Cosmarium) and blue greens (Microcystis). This study is an important step towards understanding the food web in Lake Hayq, and eventually developing a trophic model for use in fisheries management.


Keywords


Diet Composition; Feeding Habits; Food Items; Size Groups; Planktivorous; Geometric Importance Index

References


Assis, C.A. 1996. A generalised index for stomach contents analysis in fish. Scientia Marina 60: 385–389.

Baxter, R.M. and Golobitsh, D.L. 1970. A note on the limnology of Lake Hayq. Limnology & Oceanography 15 (1): 144-149.

Benavides, A.G.; Cancino, J.M. and Ojeda, F.P. 1994. Ontogenetic change in gut dimensions and microalgal digestibility in the marine herbivorous fish, Aplodactylus punctatus. Functional Ecology 8: 46–5.

Bown, S.H. 1980. Detrital non-protein amino acids are the key to rapid growth of Tilapia in Lake Valencia, Venezuela. Science 207: 1216-1218.

Bwanika, G.N.; Makanga, B.; Kizito, Y.; Chapman, L.J. and Balirwa, J. 2004. Observations n the biology of Nile tilapia, Oreo-chromis niloticus L., in two Ugandan crater lakes. African Journal of Ecoogy 42 (Supplement 1): 93–101.

Canonico, G. C.; Arthington, A.; Mccrary, J.K. and Thieme, M.L. 2005. The effects of introduced tilapias on native biodiversity. Aquatic Conservation: Marine & Freshwater Ecosystem 15: 463–483.

Clarke, K.R. 1993. Non-parametric multivariate analyses of changes in community structure. Australian Journal of Ecololgy 18: 117-143.

Defaye, D. 1988. Contribution a la connaissance des crustaces copepodes d'Ethiopie. Hydrobiologia 164: 103-147.

Demlie, M.; Ayenew,T. and Stefan, W. 2007. Comprehensive hydrological and hydrogeological study of topographically closed lakes in highland Ethiopia: The case of Hayq and Ardibo. Journal of Hydrology 339: 145– 158.

El-Sayed, A.K. and Alme-na-ei, A. 1987. Feeding ecology of Oreochromis niloticus and Tilapia zillii in a Nile canal. Hydrobiologia 146: 57–62.

Fetahi,T. 2010. Plankton Communities and Ecology of Tropical Lakes, Hayq and Awasa, Ethiopia. Ph.D. dissertation, School of Graduate Studies, Addis Ababa University, Addis Ababa. 98 pages.

Gebre-Mariam, Z.; Chapman, L.J. and Chapman, C.A. 2002. Conductivity as a predictor of a total cations and salinity in Ethiopian lakes and rivers: revisiting earlier models. Limnologica 32: 21-26.

Getabu, A. 1994. A comparative study on the feeding habits of Oreochromis niloticus in Nyanza Gulf, Lake Victoria and Sewage ponds. Pages 93-103, In: Okemwa, E., Wakwabi, E. and Getabu, A. (Edotors) Proceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheries, Kisumu, Kenya. ICIPE Press, Nairobi.

Getahun, A. 2007. An overview of the diversity and conservation status of the Ethiopian freshwater fish fauna. Journal of Afrotropical Zooology (Special issue): 87-96.

Gümüs, A.; Yilmaz, M. and Polat, N. 2002. Relative importance of food items in feeding of Chondrostoma regium Heckel, 1843, and its relation with the time of annulus formation. Turkish Journal of Zoology 26: 271- 278

Hammer, Ø.; Harper, D.A.T. and Ryan, P.D. 2001. PAST: Palaeontological Statistics, software Package for education and data analysis, ver. 1.90. Palaeonotologia Electronica.

Hyslop, E.J. 1980. Stomach content analyses- A review of methods and their application. Journal of Fish Biology 17: 411-429.

Kebede, E.; Teferra, G.; Taylor, W.D. and Gebre-/Mariam, Z. 1992. Eutrophication of Lake Hayq in the Ethiopian Highlands. Journal of Plankton Research 14 (10): 1473-1482.

Lima-Junior, S. E. and Goitein, R. 2001. A new method for the analysis of fish stomach contents. Maringã 23(2): 421-424.

Lind, O.T. 1974. Hand Book of Common Methods in Limnology. The C.V. Mosby Company, Saint Louis, 199 pages.

Marasco, R.J.; Goodman, D.; Grimes, C.B.; Lawson, P.W.; Punt, A.E. and Quinn, T.J. 2007. Ecosystem-based fisheries management: some practical suggestions. Canada Journal of Fisheries & Aquatic Science 64(6): 928(912).

Moriarty, C.M. and Moriarty, D.J.W. 1973. The assimilation of carbon from phytoplankton by two herbivorous fishes: Tilapia nilotica and Haplochromis nigripinnis. Journal of Zoology 171: 41–55.

Njiru, M.; Ojuok, J.; Getabu, A.; Jembe, T.; Owili, M. and Ngugi, C. 2008. Increasing dominance of Nile tilapia, Oreochromis niloticus (L) in Lake Victoria, Kenya: Consequences for the Nile perch Lates niloticus (L.) fishery. Aquatic Ecosystem Health and Management 11 (1): 42–49.

Njiru, M.; Okeyo-Owuor, B.; Muchiri, M. and Cowx, I.G. 2004. Shifts in the food of Nile tilapia, Oreochromis niloticus (L.) in Lake Victoria, Kenya. African Journal of Ecology 42 (3): 163-170.

Oso, J.A.; Ayodele, I.A. and Fagbuaro, O. 2006. Food and feeding habits of Oreochromis niloticus (L.) and Sarotherodon galilaeus (L.) in a Tropical Reservoir. World Journal of Zoology 1: 118-121.

Philipart, J. C. and Ruwet, T. M. 1982. Ecology and distribution of Tilapias. Pages 25-59, In: Pullin, R.S.V and Lowe-Mcconnell, R.H. (Editors.) The Biology and Culture of Tilapias. Manila, Philippines.

Shalloof, K.A. Sh. and Khalifa, N. 2009. Stomach contents and feeding habits of Oreochromis niloticus (L.) from Abu-Zabal lakes, Egypt. World Applied Science Journal 6 (1): 01-05.

Shibru Tedla. 1973. Freshwater Fishes of Ethiopia. Haile Selassie I University, Department of Biology, Addis Ababa, Ethiopia.101pages.

Sierra, L. M.; Claro, R. and Popova, O. A. 1994. Alimentación y relaciones tróficas. Pages 263-320, In: Claro, C. (Editor) Ecología de los peces marinos de Cuba,. Centro de Investigaciones de Quintana Roo (CIQRO), México.

Tadesse, Z. 1988. Studies on Some Aspects of the Biology of Oreochromis niloticus L. (Pisces. Cichlidae) in Lake Ziway, Ethiopia. M.Sc. thesis. School of Graduate Studies, Addis Ababa University, Addis Ababa. 78 pages.

Tadesse, Z. 1998. Food and Feeding Ecology of Tilapia, Oreochromis niloticus L. and Effects of Diet on the Lipid Quality of Fish in Some Lakes in Ethiopia. Ph.D. dissertation, School of Graduate studies, Addis Ababa University, Addis Ababa. 139 pages.

Tadesse, Z. 1999. The nutritional status and digestibility of Oreochromis niloticus L. diet in Lake Langeno, Ethiopia. Hydrobiologia 416: 976-106.

Tefera, G. 1987. A study on an herbivorous fish, Oreochromis niloticus L., diet and its quality in two Ethopian Rift Valley lakes, Awasa and Zwai. Journal of Fish Biology 30: 439–449.

Teferi, Y.; Admassu, D. and Mengistou, S. 2000. The food and feeding habits of Oreochromis niloticus L. (Pisces: Cichlidae) in Lake Chamo, Ethiopia. SINET: Ethiopian Journal of Science 23(1): 1-12.

Teferra, G. 1987. Food, Nutrition and Digestive Efficiency in Oreochromis niloticus L. (Pisces: Cichlidae) in Lake Awassa, Ethiopia. Ph.D dissertation, University of Waterloo, Canada. 109 pages.

Teferra, G. 1993. The composition and nutritional status of the diet of Oreochromis niloticus in Lake Chamo, Ethiopia. Journal of Fish Biology 42:864-874.

Tudorancea, C.; Fernando, C.H. and Paggi, J.C. 1988. Food and feeding ecology of Oreochromisniloticus (Linnaeus, 1758) juveniles in Lake Awassa (Ethiopia). Achiv fuer Hydrobiologie 79 (Supplement): 267-289.

Whitford, L.A. and Schumacher, G.J. 1973. A Manual of Freshwater Algae. Sparks Press. Raleigh, N.C. 324 pages.

Windell, J.T. and Bown, S.H. 1978. Methods for the study of fish diets based on analysis of stomach contents. Pages 219-226, In: Bagenal, T.B. (Editor) Methods for Assessment of Fish Production on Freshwaters. IBP. Hand book No.3, Black well, Oxford.


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