Table of Contents
Overview
Comprehensive Description
Biology
Distinguished from Neolebias by its always complete lateral line. Feeds on worms, crustaceans and insects (Ref. 7020).
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Gosse, J.-P. and E.J. Coenen 1990 Distichodontidae. p. 237-260. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and O.R.S.T.O.M., Paris, 384 p. (Ref. 2936)
http://www.fishbase.org/references/FBRefSummary.php?id=2936&speccode=5254
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Distribution
Africa: Niger and Cross Rivers in Nigeria, Cameroon, Gabon, Congo, lower part of Congo basin. Reported from Ghana (Ref. 11235) and Chad basin (Ref. 367).
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Gosse, J.-P. and E.J. Coenen 1990 Distichodontidae. p. 237-260. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and O.R.S.T.O.M., Paris, 384 p. (Ref. 2936)
http://www.fishbase.org/references/FBRefSummary.php?id=2936&speccode=5254
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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.
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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Physical Description
Morphology
Dorsal soft rays (total): 11 - 16; Analsoft rays: 10
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Gosse, J.-P. and E.J. Coenen 1990 Distichodontidae. p. 237-260. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and O.R.S.T.O.M., Paris, 384 p. (Ref. 2936)
http://www.fishbase.org/references/FBRefSummary.php?id=2936&speccode=5254
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Size
Max. size
6.2 cm TL (male/unsexed; (Ref. 2936))
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Gosse, J.-P. and E.J. Coenen 1990 Distichodontidae. p. 237-260. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and O.R.S.T.O.M., Paris, 384 p. (Ref. 2936)
http://www.fishbase.org/references/FBRefSummary.php?id=2936&speccode=5254
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Diagnostic Description
Caudal peduncle 1-1.5 x longer that high. Maxillaries extending to the anterior border of eyes. Lateral line always complete. Upper part of body gray olive, lower part whitish yellow. Dark lateral band from eye to caudal, dark stripe in middle of caudal and black spot at tip of dorsal.
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Gosse, J.-P. and E.J. Coenen 1990 Distichodontidae. p. 237-260. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux douces et saumâtres de l'Afrique de l'Ouest. Tome I. Coll. Faune Tropicale n° XXVIII. Musée Royal de l'Afrique Centrale, Tervuren and O.R.S.T.O.M., Paris, 384 p. (Ref. 2936)
http://www.fishbase.org/references/FBRefSummary.php?id=2936&speccode=5254
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Ecology
Habitat
Environment
pelagic; freshwater; pH range: 6.5 - 7.5; dH range: 12
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Habitat and Ecology
Habitat and Ecology
Systems
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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Trophic Strategy
Feeds on plants and invertebrates (Ref. 6160).
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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)
http://www.fishbase.org/references/FBRefSummary.php?id=6160&speccode=4496
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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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Trends
Population
Population
Population Trend
No information available.
Population Trend
Unknown
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Threats
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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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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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
aquarium: commercial
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Mills, D. and G. Vevers 1989 The Tetra encyclopedia of freshwater tropical aquarium fishes. Tetra Press, New Jersey. 208 p. (Ref. 7020)
http://www.fishbase.org/references/FBRefSummary.php?id=7020&speccode=5247
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