Edited by Charles Perrings, Mark Williamson and Silvana Dalmazzone
Chapter 10: The impact of invasive species in African lakes
Victor Kasulo 1 INTRODUCTION Analysis of the impact of invasive species in African lakes and rivers has focused particularly on the role of exotic ﬁsh species. This can be illustrated by the controversy over the impact of the introduction of the Nile perch (Lates niloticus) into Lake Victoria. However, the analysis can be extended to other ﬁsh species and water weeds. This chapter analyses the physical and economic impacts of the introduction and establishment of Nile perch, Tilapiine species, Tanganyika sardines and water hyacinth (Eichhornia crassipes) into African lakes and rivers. The Nile perch and Tilapiine species were introduced into Lakes Victoria, Kyoga and Nabugabo, while the Tanganyika sardines were introduced into Lakes Kariba, Kivu and Itezhi-tezhi. Water hyacinth is spreading very fast throughout Africa and is a threat to the river and lake systems of the continent (Figure 10.1). 2 FISH INTRODUCTIONS The extent of ﬁsh introductions can be analysed from the Food and Agriculture Organization’s Database on Introductions of Aquatic Species (DIAS).1 The database was initiated in the early 1980s, and originally considered only freshwater species of ﬁsh. The database has been expanded to include additional taxa, such as molluscs, crustaceans, algae and higher plants, vertebrates and invertebrates. It does not, however, include movements of organisms within the same country. To date, the database contains 2870 records of introductions, of which 2377 are ﬁsh. Africa has experienced 430 introductions representing about 15 per cent of the total. 183 184 Case studies Nile R. L. Nasser-Nubia L. Chad...
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