Show simple item record

dc.contributor.authorOchumba, P.B.O.
dc.contributor.authorGoshen, M.
dc.contributor.authorPollinger, U.
dc.date.accessioned2006-03-16T05:41:53Z
dc.date.available2006-03-16T05:41:53Z
dc.date.issued1994
dc.identifier.citationOkemwa, E.; Wakwabi, E.O.; Getabu, A. (Ed.) Proceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheries, Nairobi : ICIPE Science Press, p. 29-39en
dc.identifier.isbn9290640789en
dc.identifier.urihttp://hdl.handle.net/1834/1176
dc.description.abstractLake Victoria, the second largest lake in the world, has undergone successive dramatic changes since 1920's. Intensive non-selective fisheries, extreme changes in the drainage basin of vegetation, industrialization, agricultural developments, dams, introduction and invasion of exotic fish species that led to the destruction of the native and endemic components followed by a progressive build-up of physical and chemical changes in Lake Victoria have identified substantial increases in chlorophyll concentration and primary productivity as well as decreases in silica compared to values measured 30 years ago. Present sulphate concentration (0.1 mg/L) are lower than the lowest values reported from other large lakes in the world. There has been a shift in the phytoplankton community towards dominance of blue-greens. The zooplankton densities are relatively low and the body sizes of the organisms are small. Anoxic waters have recently been found at shallower depths than previously reported in the lake suggesting significant increases of oxygen demand in the seasonally formed hypolimnion. Algal blooms have also been enhanced in the lake. Fisheries management has led to a shift in the fishery from a multi-species (400-500 fishes including haplochromids) to only two major exotic species Lates niloticus and Oreochromis niloticus and the endemic species Rastrineobola argentea. The present practices of lake management have not resulted in the improvement of water quality.en
dc.format.extent498023 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherICIPE Science Pressen
dc.subject.otherCatchment area
dc.subject.otherWater quality
dc.subject.otherLates niloticus
dc.subject.otherKenya
dc.subject.otherLake Victoria
dc.titleEcological changes in Lake Victoria after the invasion of Nile perch (Lates Niloticus): the catchment, waters quality and fisheries management.en
dc.typeProceedings Paper
dc.bibliographicCitation.authorsOkemwa, E
dc.bibliographicCitation.authorsWakwabi, E.O.
dc.bibliographicCitation.authorsGetabu, A.
dc.bibliographicCitation.conferencenameSecond EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheriesen
dc.bibliographicCitation.conferenceplaceNairobien
dc.bibliographicCitation.endpage39en
dc.bibliographicCitation.stpage29en
dc.bibliographicCitation.titleProceedings of the Second EEC Regional Seminar on Recent Trends of Research on Lake Victoria Fisheriesen
dc.description.statusPublisheden
dc.subject.agrovocEnvironmental impacten
dc.subject.agrovocFishery managementen
dc.subject.agrovocLake fisheriesen
dc.subject.asfaEnvironmental impacten
dc.subject.asfaFishery managementen
dc.subject.asfaIntroduced speciesen
dc.subject.asfaLake fisheriesen
dc.type.refereedNon-Refereeden
refterms.dateFOA2021-01-30T18:47:37Z


Files in this item

Thumbnail
Name:
9290640789-P2939.pdf
Size:
486.3Kb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record