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dc.contributor.authorNjiru, M.
dc.date.accessioned2021-06-24T16:02:40Z
dc.date.available2021-06-24T16:02:40Z
dc.date.issued1999
dc.identifier.urihttp://hdl.handle.net/1834/22555
dc.description.abstractOreochrimis niloticus (L.) was introduced to Lake victoria in the 1950s. It remained relatively uncommon in catches until 1965, when the numbers began to increase dramatically. It is now the third most important commercial fish species after the Nile perch, Lates niloticus (L.) and Rastrineobola argentea (Pellegrin). Oreochromis niloticus is considered a herbivore, feeding mostly on algae and plant material. The diet now appears to be more diversified , with insects, fish, algae and plant materials all being important food items. Fish smaller than 5 cm TL have a diverse diet but there is a decline in the importance of zooplankton, the preferred food item of small fish, as fish get larger. The shift in diet could be due to changes which have occurred in the lake. Water hyacinth, Eichhornia crassipes (Mart.) Solms, which harbours numerous insects in its root balls, now has extensively coverage over the lake. The native fish species which preyed on these insects (e.g. haplochromines) have largely been eliminated and O. niloticus could be filling niches previously occupied by these cichlids and non cichlid fishes. The change in diet could also be related to food availability and abundance where the fish is feeding on the most readily available food items.
dc.description.sponsorshipLake Victoria Fisheries Research Project Phase II
dc.formatapplication/pdf
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherLake Victoria Fisheries Research Project
dc.relation.ispartofseriesLVFRP Technical Document
dc.relation.urlhttp://www.lvfo.org/
dc.subject.otherBiology
dc.subject.otherFisheries
dc.subject.otherInformation Management
dc.subject.otherAfrica
dc.subject.otherKenya
dc.subject.otherLake Victoria
dc.subject.otherNile tilapia
dc.subject.otherwater hyacinth
dc.subject.otherdata collection
dc.titleChanges in feeding biology of Nile tilapia, Oreochromis niloticus (L.), after invasion of water hyacinth, Eichhornia crassipes (Mart.) Solms, in Lake Victoria, Kenya
dc.typebook_section
dc.bibliographicCitation.issue7
dc.description.notesLVFRP/TECH/99/07
dc.format.pagerange175-183
dc.publisher.placeJinja, Uganda
dc.title.parentReport on Fourth FIDAWOG Workshop held at Kisumu, 16 to 20 August 1999
refterms.dateFOA2021-06-24T16:02:40Z
dc.source.legacyrecordurlhttp://aquaticcommons.org/id/eprint/5006
dc.source.legacydepositorid424
dc.source.legacylastmod2011-09-29 15:34:19
dc.source.legacyid5006
dc.source.legacyagencyLake Victoria Fisheries Organization


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