Abstract
Recent ecological changes in the Lake Victoria ecosystem have been attributed to the effects of species stockings and, in particular, from predation pressure by the Nile perch. Evidence for the decline of haplochromines due to predation by the Nile perch, while overwhelming, does not necessarily account for these gross ecological changes. Ecological theory predicts that natural fluctuation would occur in a fisheries where predator and prey species could alternate in abundance. The absence of a substantial recovery of the endemic species within cyclical abundance patterns in Lake Victoria (even though they could be delayed), particularly in the pelagic and profundal zones, points to other causal factors.
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