Overview

Distribution

Range Description

Bagrus caeruleus is only known from the type locality (near Inga hydroelectric dam and near Gombe or Ngombe about 20 km downstream from Kinshasa). It has recently been found in between these sites.
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Africa: present in the rapids of the lower Congo River (Ref. 78218). Possibly only known from the type locality near Inga hydroelectric dam and near Gombe (or Ngombe), about 20 km downstream from Kinshasa, Lower Congo River (Ref. 3236, 42510).
  • 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)
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Lower Congo River, Democratic Republic of Congo.
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Physical Description

Morphology

Analsoft rays: 6 - 7
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Size

Maximum size: 210 mm SL
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Max. size

21.0 cm SL (male/unsexed; (Ref. 42510))
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Diagnostic Description

Eye small, decreasing in relative size with growth; occipital processus widely separated from first interneural bone; juveniles as well as adults bluish on the back and sides, with a darkened area in front of the dorsal fin (more noticeable in juveniles); undersides of head and abdomen pale, and edges of upper and lower caudal fin lobes whitish (Ref. 42510).
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Type Information

Paratype for Bagrus caeruleus Roberts & Stewart
Catalog Number: USNM 216380
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): T. Roberts & D. Stewart
Year Collected: 1973
Locality: Zaire River Mainstream Near Inga Hydroelectric Dam, Democratic Republic of the Congo, Africa
  • Paratype: Roberts, T. R. & Stewart, D. J. 1976. Bulletin of the Museum of Comparative Zoology. 147 (6): 275.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Bagrus caeruleus is a demersal species that prefers streams.

Systems
  • Freshwater
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Environment

demersal; freshwater
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Trophic Strategy

Only known from the type locality, in a fast-flowing stream (rapids)(Ref. 42510).
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2010

Assessor/s
Moelants, T.

Reviewer/s
Brummett, R., Mbe Tawe, A.N., Dening Touokong, C., Reid, G.M., Snoeks, J. Staissny, M., Moelants, T., Mamonekene, V., Ndodet, B., Ifuta, S.N.B., Chilala, A., Monsembula, R., Ibala Zamba, A., Opoye Itoua, O., Pouomogne, V., Darwall, W. & Smith, K.

Contributor/s

Justification
This species is restricted to a approximately 250 km stretch of the Lower Congo River in the vicinity of the Inga 1 and 2 dams. Although currently assessed as Vulnerable, should Inga 3 be built, the status would probably be upgraded to Critically Endangered.
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Population

Population
No information available.

Population Trend
Unknown
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Threats

Major Threats
Inga 1 and 2 are existing dams with a minimal impact. Inga 3, to be built in five years, will divert a significant amount of flow. Grant Inga will block a great part of the mainstream with major impact. It can also be threatened in the future by mining in the Luozi region. The key component of concrete is found in this region, and there is potential to mining in the area.
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Vulnerable (VU) (D2)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
None known.
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