Overview

Comprehensive Description

Biology

Occurs in shallow inshore waters and influent rivers (Ref. 34291). Spends most of its life span in lake, but spawns in flooded grassland beside both permanent and temporary streams. Caught with weirs and in baskets (Ref. 4967). Feeds on detritus and algae (Ref. 13624). Also feeds on rotifers growing on the body of other fishes (Ref. 34291). Oviparous (Ref. 205).
  • Reid, G.M. 1985 A revision of African species of Labeo (Pisces: Cyprinidae) and a re-definition of the genus. Verlag von J. Cramer, Braunschweig. 322 p. (Ref. 1440)
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Distribution

Range Description

Endemic to Lake Victoria drainage (Seegers et al. 2004) where, since the introduction of the Nile Perch (Lates niloticus) extent of occurrence (EOO) has decreased from a 20 m depth range observed during the 1969–71 survey (Kudhongania and Cordone 1974) to a 10 m range during the 1997–99 surveys (Okaranon et al. 1999, Getabu and Nyaundi 1999, Mkumbo and Ezekiel 1999). It is now very rare being occasionally encountered in the shallow inshore close to affluent rivers and streams. Its estimated EOO in Lake Victoria is 12,580 km². The species is also distributed in Lake Katwe (EOO=2.5 km²), Lake Kubigena (EOO <1 km²), and Lake Kyoga. Also distributed throughout the upper and middle Akagera system and the Victoria Nile.
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Eastern Africa: Lake Victoria drainage.
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Africa: Lake Victoria (Nile drainage basin). There is one record from the Victoria Nile and one from Lake Kyoga.
  • Reid, G.M. 1985 A revision of African species of Labeo (Pisces: Cyprinidae) and a re-definition of the genus. Verlag von J. Cramer, Braunschweig. 322 p. (Ref. 1440)
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Physical Description

Size

Maximum size: 330 mm SL
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Max. size

41.0 cm SL (male/unsexed; (Ref. 34290))
  • van Oijen, M.J.P. 1995 Appendix I. Key to Lake Victoria fishes other than haplochromine cichlids. p. 209-300. In F. Witte and W.L.T. van Densen (eds.) Fish stocks and fisheries of Lake Victoria. A handbook for field observations. Samara Publishing Limited, Dyfed, Great Britain. (Ref. 34290)
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Diagnostic Description

Lateral line running along middle of the flank and the caudal peduncle. Flap of skin in front of upper lip. Jaws with horny cutting ridges. Barbels hidden. Olivaceous dorsally, light or creamy ventrally. Dorsal, anal and pelvic fins often orange-tipped (Ref. 34290).
  • van Oijen, M.J.P. 1995 Appendix I. Key to Lake Victoria fishes other than haplochromine cichlids. p. 209-300. In F. Witte and W.L.T. van Densen (eds.) Fish stocks and fisheries of Lake Victoria. A handbook for field observations. Samara Publishing Limited, Dyfed, Great Britain. (Ref. 34290)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Occurs in shallow inshore waters and influent rivers (Witte and Winter 1995). Spends most of its life span in lakes, but spawns in flooded grassland beside both permanent and temporary streams. Feeds on detritus and algae (Fermon 1997) and rotifers growing on the bodies of other fishes (Witte and Winter 1995) (after Froese and Pauly 2003).Max. size: 41.0 cm SL (after Froese and Pauly 2003).

Systems
  • Freshwater
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Environment

benthopelagic; potamodromous (Ref. 51243); freshwater; depth range 0 - 20 m (Ref. 34291)
  • Riede, K. 2004 Global register of migratory species - from global to regional scales. Final Report of the R&D-Projekt 808 05 081. Federal Agency for Nature Conservation, Bonn, Germany. 329 p. (Ref. 51243)
  • Witte, F. and W. de Winter 1995 Appendix II. Biology of the major fish species of Lake Victoria. p. 301-320. In F. Witte and W.L.T. Van Densen (eds.) Fish stocks and fisheries of Lake Victoria. A handbook for field observations. Samara Publishing Limited, Dyfed, Great Britain. (Ref. 34291)
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Migration

Potamodromous. Migrating within streams, migratory in rivers, e.g. Saliminus, Moxostoma, Labeo. Migrations should be cyclical and predictable and cover more than 100 km.
  • Riede, K. 2004 Global register of migratory species - from global to regional scales. Final Report of the R&D-Projekt 808 05 081. Federal Agency for Nature Conservation, Bonn, Germany. 329 p. (Ref. 51243)
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Diseases and Parasites

Dactylosoma Infection 1. Parasitic infestations (protozoa, worms, etc.)
  • Baker, J.R. 1960 Trypanosomes and dactylosomes from the blood of fresh-water fish in East-Africa. Parasitology 50:515-526. (Ref. 52501)
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Labeo victorianus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 98
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2006

Assessor/s
Bayona, J.D.R.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)

Contributor/s

Justification
Global Assessment: Wide distribution throughout the Lake Victoria drainage. Localised decline (Lake Victoria) but insufficient to threaten the entire population.
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Population

Population
During the pre-Nile Perch era the species supported semi-commercial/artisanal fisheries. During 1969/71 surveys catch rates of up to 0.4 kg/haul/hour were observed. In recent surveys the catch rate has slightly increased to 0.7 kg/haul/hour. Increase in the population size was reported by Bayona et al. (2001) and Chande and Mhitu (2001). Common in commercial fish catches in upper and middle Akagera lakes. Wide extent of occurrence but very rarely encountered;

Population Trend
Increasing
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Threats

Major Threats
Fishing with small meshed nets across rivers or river mouths during the spawning migration; predation impact by the Nile perch; silting and destruction of spawning/nursery grounds; competitive displacement by introduced fish species; and loss of marginal vegetation around lakes and rivers due to agriculture extension.
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Least Concern (LC)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
Usually, bays and gulfs with affluent rivers are legislated as closed areas for fishing from 1st January to 30th June each year in order to protect spawners and juveniles.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial
  • Robins, C.R., R.M. Bailey, C.E. Bond, J.R. Brooker, E.A. Lachner, R.N. Lea and W.B. Scott 1991 World fishes important to North Americans. Exclusive of species from the continental waters of the United States and Canada. Am. Fish. Soc. Spec. Publ. (21):243 p. (Ref. 4537)
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Wikipedia

Ningu

The Ningu (Labeo victorianus) is a species of ray-finned fish in the Cyprinidae family. It is found in Burundi, Kenya, Tanzania, and Uganda. Its natural habitats are rivers, swamps, freshwater lakes, freshwater marshes, and inland deltas.

References

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