Overview

Comprehensive Description

Biology

Distinguished from Neolebias by its always complete lateral line (Ref. 2936). Feeds on worms, crustaceans and insects (Ref. 7020).
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Distribution

Range Description

This species is known from Nigeria to Sudan.

Central Africa: Nannaethiops unitaeniatus is known from the Dja River basin and from Bangui, Ubangui basin. Elsewhere, it is known from the Lower Guinea region where it is widespread in all major drainages.

Northeast Africa: It is present in the upper White Nile.

Western Africa: It occurs in the Niger and Cross Rivers in Nigeria, and is reported from the Chad basin.
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Africa: Niger and Cross River in Nigeria (Ref. 2936, 31256, 86396) and Chad basin (Ref. 367, 86396). Found in Cameroon, Gabon, Equatorial Guinea, DRCongo, Republic of Congo, Cabinda (Ref. 81638). Also reported from Ghana (Ref. 11235) and the lower part of the Congo basin (Ref. 2936, 94734).
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Africa.
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 12 - 14; Analspines: 0; Analsoft rays: 9 - 11
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Size

Maximum size: 62 mm TL
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Max. size

6.2 cm TL (male/unsexed; (Ref. 2936))
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Diagnostic Description

Diagnosis: distinguished from Neolebias by its always complete lateral line; caudal peduncle 1-1.5x longer that high (Ref. 2936, 86396). 32-36 scales in a longitudinal series (Ref. 81638, 86396). Four, rarely 5, scales between dorsal fin origin and lateral line (Ref. 81638). 11-16 (Ref. 86396) or 12-14 (Ref. 81638) total dorsal fin rays. 10 (Ref. 86396) or 9-11 (Ref. 81638) total anal fin rays. Description: small elongate fish, body moderately deep, 0.28-0.38 SL and laterally compressed; mouth terminal with two rows of bicuspid teeth in each jaw (Ref. 2936, 81638, 86396). Maxilla extending to the anterior border of eyes (Ref. 2936, 86396). Premaxilla with 11-12 teeth in outer row, maxilla with 2-3 teeth along anterodorsal margin, dentary with 11-12 teeth in outer row; adipose fin present; 4 scales between lateral line and anal fin origin; D: III,9-11; A: II-III,7-8 (Ref. 81638). Coloration: preserved specimens yellowish tan; dark chromatophores on upper lip, snout and head; field of dark chromatophores extending from behind orbit to rear of opercle, sometimes forming horizontal band continuous with dark mid-lateral band on body; scales dorsal to lateral line with exposed portion of scale dark other than for ctenii and immediately adjoining portion of main body of scale; caudal fin with dark band on middle rays and with scattered dark chromatophores on remainder of fin; anterior rays of dorsal fin with dark chromatophores; chromatophore field denser on distal portions of rays; remainder of dorsal fin and central portions of pelvic and pectoral fins with scattered chromatophores; live specimens with dark mid-lateral band prominent and with dorsal and caudal fins suffused with red, more so in males (Ref. 81638). Back olivaceous-grey, lower parts and belly whitish; dark mid-lateral band from eye to caudal fin, comprising lower thirds of lateral-line scales and two thirds of those in next-lower series; black spot on dorsal-fin tip (Ref. 2936, 86396).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Nannaethiops unitaeniatus is a pelagic species. It is distinguished from Neolebias by its always complete lateral line. It lives in small streams where and is omnivorous feeding mainly crustaceans and insects (Mills and Vevers 1989).

Systems
  • Freshwater
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Environment

pelagic; freshwater; pH range: 6.5 - 7.5; dH range: 12
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Trophic Strategy

Feeds on plants and invertebrates (Ref. 6160).
  • Hickley, P. and R.G. Bailey 1987 Food and feeding relationships of fish in the Sudd swamps (River Nile, southern Sudan). J. Fish Biol. 30:147-159. (Ref. 6160)
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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
Getahun, A., Lalèyè, P., Moelants, T. & Olaosebikan, B.D.

Reviewer/s
Snoeks, J., Tweddle, D., Getahun, A., Lalèyè, P., Paugy, D., Zaiss, R., Fishar, M.R.A & Brooks, E.

Contributor/s

Justification
This species has a wide distribution, with no known major widespread threats. It is therefore listed as Least Concern. Within the west African region, this species is known from five to six locations from Niger and Cross Rivers in Nigeria and Cameroon, and the Chad basin. Its AOO is less than 2,000 km². The species is found the areas affected by deforestation due to agriculture, mining and urbanisation development. It is assessed as Vulnerable. More information is required on the species distribution and threats within north eastern Africa, and it is therefore categorized as Data Deficient. It is estimated that less than 5 % of the species is found in the central African region and it is therefore categorized as Not Applicable.
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Population

Population
No information available.

Population Trend
Unknown
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Threats

Major Threats
This is a commercially valuable aquarium fish. It is threatened by oil exploration in the lower Niger delta and the potential water basin transfer from the Oubangui to the Chari system.
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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
None known. More research is needed into this species threats and potential conservation measures, as well as monitoring of population trends. Habitat conservation is also required.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: ; aquarium: commercial
  • Mills, D. and G. Vevers 1989 The Tetra encyclopedia of freshwater tropical aquarium fishes. Tetra Press, New Jersey. 208 p. (Ref. 7020)
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