Brachypetersius gabonensis Poll, 1967
photo by Cutler, J.

Family:  Alestidae (African tetras)
Max. size:  7 cm SL (male/unsexed)
Environment:  pelagic,
Distribution:  Africa: Lower Guinea endemic, restricted to the Ogowe and Como River basins in Gabon (Ref. 80290).
Diagnosis:  Anal spines: 0-0; Anal soft rays: 21-22. Diagnosis: 4.5 scales between lateral line and dorsal fin origin; 18-19 anal fin branched rays; flanks with dark lateral pigment band from opercular margin to caudal fin; humeral spot present (Ref. 80290). Description: body moderately robust, greatest body depth 35-38% of SL and head length 30-33% of SL; mouth terminal to slightly superior, lower jaw prominent, its depth about 1.5x that of upper jaw; premaxilla with 2 teeth in outer row each bearing 3-5 cusps, 4 teeth in inner row each bearing 5-7 cusps; dentary with 4 teeth in outer row each bearing 5-7 cusps, a monocuspid inner dentary tooth present posterior to outer row teeth; lateral line canal complete, 25-27 tubes, ultimate canal-bearing scale separated from caudal fin rays by 2-3 non-canal-bearing scales; anal fin with 3 unbranched and 18-19 branched rays (Ref. 80290). Coloration: flanks yellow-silver; broad distinct dark lateral band more or less continuous from opercular margin to posterior margin of median caudal fin rays; ovoid humeral spot often present in larger individuals; dorsum with diffuse pigmentation, somewhat darker than ventral half of body, tending toward multiple faint lateral bands in larger individuals; fins generally dusky to yellowish in life (Ref. 80290).
Biology:  Affinities: most similar to Brachypetersius huloti from the Congo River basin, from which it differs in the extension of the lateral band onto the median caudal fin rays, presence of a humeral spot and fewer scales (4.5-5.5 vs 6.5) in transverse series between lateral line and dorsal fin origin (Ref. 80290).
IUCN Red List Status: Least Concern (LC); Date assessed: 16 February 2009 Ref. (120744)
Threat to humans:  harmless
Country info:   

Entered by: Sa-a, Pascualita - 20.06.94
Modified by: Boden, Gert - 09.06.16

Source and more info: For personal, classroom, and other internal use only. Not for publication.

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