Microctenopoma nanum (Günther, 1896)
Dwarf ctenopoma
Microctenopoma nanum
photo by Hippocampus-Bildarchiv

Family:  Anabantidae (Climbing gouramies)
Max. size:  6.67 cm SL (male/unsexed)
Environment:  benthopelagic; freshwater; pH range: 6 - 7.19999980926514; dH range: 15,
Distribution:  Africa: widely distributed in the Congo River basin in Central African Republic, Republic of Congo and Democratic Republic of the Congo (Ref. 39599). Also widespread in Lower Guinea, from the Sanaga in Cameroon (Ref. 51193, 81650) south to the Chiloango (Ref. 81650, 120641). Reports from the Congo and Zambezi basins in Angola (Ref. 11970) belong to other species (Ref. 39599 and Norris unpubl.).
Diagnosis:  Dorsal spines (total): 13-18; Dorsal soft rays (total): 7-11; Anal spines: 6-10; Anal soft rays: 7-11; Vertebrae: 26-28. Diagnosis: interorbital space narrow, 3.3-4.5 times in head length; 13-18 dorsal and 6-10 anal fin spines; flanks with even and distinct bars at all sizes; in adults, subopercle usually serrated and caudal fin squared; caudal peduncle developed; breeding males never marked with orange (Ref. 81650). Description: snout relatively acute; head profile straight; mouth relatively large; 3-16 scales in upper lateral line, 0-12 in lower; 2-4 scales above upper lateral line, 7-10 scales below; 1-8 serrations above opercular notch, no serrations within notch, 1-6 serrations below, 0-18 subopercular serrations, interopercle and preopercle entire (Ref. 81650). Coloration: well-preserved specimens nearly always distinctly barred; each of 6-8 dark bars a little wider than pale interspaces; bars almost invariably straight and vertical with evenly edged borders, and usually continue onto anal and dorsal fin bases; pelvic fin with dark stripe along anterior edge; dorsal and anal fin spines and rays frequently capped with white; usually 1-2 horizontal streaks on cheek just posterior to orbit; dark patch at dorsal border of opercle; dark bars on Lower Guinean specimens wider than those from Congo (Ref. 81650).
Biology:  Maximum total length reported 8.0 cm (Ref. 6803).
IUCN Red List Status: Least Concern (LC); Date assessed: 16 February 2009 Ref. (130435)
Threat to humans:  harmless


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