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The Nile perch, Lates niloticus (L.), stock in Lake Victoria may be showing signs of overfishing as the average size of fish decreased rapidly in 2007 when the stock biomass fell by 50%. Fishers have increasingly abandoned large‐meshed gillnets in favour of small hooks on long lines. This has allowed prey species (Rastrineobola argentea [Pellegrin] and haplochromines) to increase, shifting the fishery...
Samples of fish were collected from 42 stations in streams around Harare, Zimbabwe. The total abundance of fish was lower by 50% or more at stations where the exotic predators Micropterus salmoides andSerranochromis robustus were present compared with stations where they were absent. The greatest differences in density occurred among small Barbus species, whose populations were 86% lower (S. robustus...
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