Diel vertical migration of major fish-species in Lake Victoria, East Africa

P.C. Goudswaard, J.H. Wanink, F. Witte, E.F.B. Katunzi, M.R. Berger, D.J. Postma

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    Abstract

    Understanding of migration patterns is essential in the interpretation of hydro-acoustic stock assessment data of partly demersal partly pelagic fish stocks. In this paper we provide this kind of information for some species that were common in the Mwanza Gulf of Lake Victoria in the 1980s, before and after the upsurge of introduced Nile perch (Lates niloticus). Detritivorous haplochromines and Nile tilapia (Oreochromis niloticus), both stay near the bottom during day and night. Feeding seems to occur predominantly during the day. The zooplanktivorous haplochromines and dagaa (Rastrineobola argentea) dwell near the bottom by day and migrate towards the surface during the night. They seem to follow their prey, zooplankton and lake-fly larvae. Piscivorous nembe (Schilbe intermedius) show similar migration patterns to zooplanktivorous fishes, but their behaviour cannot be unambiguously explained by pursuit of prey. Nile perch to some extend migrate into the column at night, though the majority remains near the bottom. Feeding takes place during day and night
    Original languageEnglish
    Pages (from-to)141-152
    JournalHydrobiologia
    Volume513
    Issue number1-3
    DOIs
    Publication statusPublished - 2004

    Keywords

    • lates-niloticus l
    • nile perch upsurge
    • haplochromine cichlids
    • mwanza gulf
    • rastrineobola-argentea
    • sockeye salmon
    • feeding-habits
    • nyanza-gulf
    • food
    • extinction

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  • Cite this

    Goudswaard, P. C., Wanink, J. H., Witte, F., Katunzi, E. F. B., Berger, M. R., & Postma, D. J. (2004). Diel vertical migration of major fish-species in Lake Victoria, East Africa. Hydrobiologia, 513(1-3), 141-152. https://doi.org/10.1023/B:hydr.0000018179.80116.93