Overview
Comprehensive Description
Biology
Present in the deeper waters of large rivers (Ref. 4967).
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Risch, L.M. 1986 Bagridae. p. 2-35. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ISNB, Brussels; MRAC, Tervuren; and ORSTOM, Paris. Vol. 2. (Ref. 3236)
http://www.fishbase.org/references/FBRefSummary.php?id=3236&speccode=9338
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Distribution
Range Description
This species is found in southeastern Africa:
Eastern Africa: Within Tanzania, this species is distributed in Mtera dam , Kidatu dam, Rivers Pangani, Ruvuma and Rufiji. In Malawi, it is reported to occur in Lake Chiuta.
Southern Africa:It is present in the Rovuma River system, from the Mozambique-Tanzanian border north to the Pangani system in Tanzania. Also present in Lake Chiuta, Malawi which is tenuously linked to the Rovuma system.
Eastern Africa: Within Tanzania, this species is distributed in Mtera dam , Kidatu dam, Rivers Pangani, Ruvuma and Rufiji. In Malawi, it is reported to occur in Lake Chiuta.
Southern Africa:It is present in the Rovuma River system, from the Mozambique-Tanzanian border north to the Pangani system in Tanzania. Also present in Lake Chiuta, Malawi which is tenuously linked to the Rovuma system.
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Africa: River Pangani (Tanzania).
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Risch, L.M. 1986 Bagridae. p. 2-35. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ISNB, Brussels; MRAC, Tervuren; and ORSTOM, Paris. Vol. 2. (Ref. 3236)
http://www.fishbase.org/references/FBRefSummary.php?id=3236&speccode=9338
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Physical Description
Morphology
Dorsal spines (total): 1; Dorsal soft rays (total): 9 - 10; Analsoft rays: 13 - 14
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Boulenger, G.A. 1911 Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History). Volume II. Printed by order of the Trustees, London. 529 p. (Ref. 2988)
http://www.fishbase.org/references/FBRefSummary.php?id=2988&speccode=9281
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Size
Max. size
44.7 cm TL (male/unsexed; (Ref. 52249))
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Steindachner, F. 1916 Bericht über die ichthyologischen Aufsammlungen der Brüder Adolf und Albin Horn während einer im Sommer 1913 ausgeführten Reise nach Deutsch-Ostafrika. Denkschr. Kais. Akad. Wiss. 92:59-86. (Ref. 52249)
http://www.fishbase.org/references/FBRefSummary.php?id=52249&speccode=9285
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Diagnostic Description
Head much depressed, smooth above or finely striated on sides of elongate fontanelle; premaxillary band of teeth 5-6 times as long as broad, nearly as broad as the band of vomerine teeth; snout truncate (Ref. 2988). Snout projecting beyond lower jaw (Ref. 52162, Ref. 2988). Maxillary barbel 1.66-2 times head length, reaching pelvics (Ref. 52162), but not passing the base of the pelvics (Ref. 1884). Nasal barbel 1/5-1/3 of head length; inner mandibular barbel 0.33-0.4 times head length (Ref. 2988). Outer mandibular barbel 0.60-0.66 times head length (Ref. 52162, Ref. 2988). Occipital processus long and narrow, almost reaching the interneural (Ref. 52249). Last ray of dorsal fin above vertical of first ray of pelvics; dorsal spine smooth, feeble; adipose fin 4-5.5 times as long as deep, about twice as long as dorsal fin; caudal fin deeply forked, with pointed lobes (Ref. 2988). Upper lobe of caudal fin with short filament (Ref. 52249). Pectoral spine moderately strong, smooth, or very slightly serrated behind (Ref. 2988). Coloration: brown or olive above, white beneath; black dots sometimes scattered on the back and on the adipose and caudal fins (Ref. 2988).
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Boulenger, G.A. 1911 Catalogue of the fresh-water fishes of Africa in the British Museum (Natural History). Volume II. Printed by order of the Trustees, London. 529 p. (Ref. 2988)
http://www.fishbase.org/references/FBRefSummary.php?id=2988&speccode=9281
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Ecology
Habitat
Habitat and Ecology
Habitat and Ecology
Systems
It is distributed in deep waters of large rivers and lakes. It is a predator, that feeds sometimes on shrimp.
Systems
- Freshwater
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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
2010
Assessor/s
Bayona, J., Bills, R., Engelbrecht, J. & Kazembe, J.
Reviewer/s
Snoeks, J., Tweddle, D., Getahun, A., Lalèyè, P., Paugy, D., Zaiss, R., Fishar, M.R.A & Brooks, E.
Contributor/s
Justification
A widely distributed species effected by local decline. The wider population is, however, not impacted by any known widespread major threats, and is therefore listed as Least Concern. Although not abundant it is sufficiently widespread to be also classified as Least Concern in regional assessments for eastern and southern Africa.
History
- 2006Least Concern(IUCN 2006)
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Trends
Population
Population
Population Trend
Little information is known on the population trends of this species, however it is reported to be declining in Tanzania.
Population Trend
Unknown
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Threats
Threats
Major Threats
Threats to this species include:
- Mass kills due to asphyxiation. A serious event was observed in Tanzania in 1984.
- Illegal fishing practice, especially by use of under meshed gill-nets and other illegal techniques.
- Weed infestation and high turbidity.
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Least Concern (LC)
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IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
http://www.fishbase.org/references/FBRefSummary.php?id=57073
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Management
Conservation Actions
Conservation Actions
No information available. More research is needed into this species population numbers and range, biology and ecology, habitat status and threats, as well as monitoring and potential conservation measures. Sustainable management of riverine fisheries is also needed.
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Relevance to Humans and Ecosystems
Benefits
Importance
fisheries: commercial
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Eccles, D.H. 1992 FAO species identification sheets for fishery purposes. Field guide to the freshwater fishes of Tanzania. Prepared and published with the support of the United Nations Development Programme (project URT/87/016). FAO, Rome. 145 p. (Ref. 4967)
http://www.fishbase.org/references/FBRefSummary.php?id=4967&speccode=11098
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Wikipedia
Bagrus orientalis
Bagrus orientalis is a species of fish in the Bagridae family. It is found in Malawi and Tanzania. Its natural habitat is freshwater lakes.
References
- Bayona, J. & Kazembe, J. 2005. Bagrus orientalis. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007.
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