Ecological Role: W. auropunctata is an extremely competitive tramp ant species with generalist habitat and food requirements. The larger fishes were chopped into pieces and fried Ligtvoet et al., 1995). After Pais, Lobo is the second European to describe the sources of the Blue Nile and he did so more exactly than Bruce" (transl. However, in the years after the upsurge, people rapidly adjusted the processing and transport techniques. In fact, they did this so efficiently that entire species began to disappear before the eyes of frustrated ichthyologists; many species vanished before they could even be formally described (Goldschmidt 1996). Yet it has never been clear why, when, or by whom the fish was introduced.

"Native to Atlantic coastal regions, white perch invaded the Great Lakes through the Erie and Welland canals in 1950. Meanwhile, Amazonian water hyacinth invaded the lake, creating mats of floating leaves and flowers that prevented fishing and blocked light to the waters below. The nonnative Nile perch (Lates niloticus) in Lake Victoria, and the ecological changes associated with the species' establishment and expansion there, has elicited tremendous attention from biologists. As Nile perch increased in number, they did what they had been introduced to do: prey voraciously on the haplochromines. Nile perch then replaced the native fish diversity and irreversibly altered the ecosystem and its role to lakeshore societies: it is now a prised export product that supports millions of livelihoods. Nile perch invasion history, with three being uninvaded, four having established Nile perch populations, and two (Bisina and Nawampasa) having experienced a transient Nile perch presence. What harm can White perch cause to the invaded environment? Invasive species are believed to be the sole cause of at least 126 extinctions since the year 1500, representing 13% of all cases studied in the period. "He was the best expert on Ethiopian matters. Once LFAs have invaded an area, they quickly outcompete local invertebrates. Nile perch began feeding on alternative prey including R. argentea. Although R. argentea has always had native predators in the Lake Victoria basin (see below), the high densities of Nile perch observed in most invaded lakes, combined with the occurrence of R. argentea in Nile perch stomach contents, suggest that the Nile Nile perch was introduced to Lake Victoria in 1954 and decimated over 200 native species in the lake. We explored the hypothesis that O. niloticus exhibits increased omnivory in response to a decline in abundance of haplochromine cichlids. Little wonder then, that ancient Egyptians venerated the Nile recognizing that its waters were home to perch fish and other fish, its marshes harboured a profusion of waterfowl and papyrus for boats and books, while its loamy riverbanks and flood plains produced the mud needed for bricks for its colossal construction projects. The upsurge of Nile perch in Lake Victoria was first observed in the Nyanza Gulf, Kenya, in 1979. Abstract – Nile tilapia (Oreochromis niloticus L.) is the dominant of the introduced tilapiines in many East African lakes and has flourished in the presence of introduced Nile perch (Lates niloticus L.). Both Nile tilapia and sunfish occupied the structured habitat significantly more often than they did the sand habitat in single species treatments (Figure 1).        White perch becomes competition for the native species in the struggle for food ; It can cause a decrease in the amount of native species, especially Walleye and White Bass since those two species' eggs make 100% of White perch's diet during the reproductive season (between March and July) Lake Bisina was stocked with Nile perch in the early 1970s and sustained a Nile perch fishery for a time (Mbabazi, 2004).


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