Chromidotilapia regani (Pellegrin, 1906)
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Family:  Cichlidae (Cichlids), subfamily: Pseudocrenilabrinae
Max. size:  12.7 cm SL (male/unsexed)
Environment:  benthopelagic,
Distribution:  Africa: northern part of Ogooue system and northwestern parts of Gabon (Ref. 59155).
Diagnosis:  Dorsal spines (total): 14-17; Dorsal soft rays (total): 10-12; Anal spines: 3-3; Anal soft rays: 6-8. Diagnosis: high number of branchiospines on first outer branchial arch (23-31); first dorsal fin spine length 70-80% of the length of the 5th spine (Ref. 59155, 52307, 81260). When stressed with 2 continuous dark bands on body (Ref. 81260). Description: compressed, deep-bodied (body depth 36.5-41.1%, mean 38.6% SL); snout prominent, pointed (snout length 33.7-47.4%, mean 42.3% HL); lachrymal deep (26.5-33.0%, mean 30.6% HL); predorsal profile steep, straight to dorsal fin origin (Ref. 81260). Infraorbital bones series complete with lachrymal and 4 other bones; lachrymal with 5 openings of laterosensory system; premaxilla with 2-3, dentary with 2 rows of unicuspid teeth; anteriorly in the lower jaws some teeth oriented posteriorly, not bucally; 2-4 rows of scales on cheek; lower pharyngeal bone triangular, with teeth shouldered unicuspid (lateral parts of the bone) or asymmetrical bicuspid (central field); well developed hanging pad on roof of pharynx (Ref. 59155). Caudal peduncle usually deeper than long or as deep as long (Ref. 81260). 13-16 (median 14) markedly tuberculate hypobranchial and ceratobranchial rakers, 8-15 (median 12) lanceolate epibranchial rakers (Ref. 59155, 81260). Adults of both sexes with some dorsal and anal fin rays elongated, caudal truncate to subtruncate; sexual dimorphism muted, males slightly larger than females with dorsal and anal rays a little more elongated (Ref. 81260). Chest scales smaller than flank scales, which are large (Ref. 59155, 81260). Scales cycloid; 3-4 horizontal scale rows on operculum; upper part of lateral line with 17-21 scales, lower with 7-12; end of upper lateral line sometimes overlapping lower lateral line by up to 1 or 2 scale rows; about 1/3 of caudal fin basally covered with scales, other fins unscaled (Ref. 59155). 2.5-3 scales between 8th pored scale of upper lateral line and dorsal fin base (Ref. 59155, 81260), 1-2 between last pored scale and dorsal fin base (Ref. 59155). 13-14 abdominal and 12 caudal vertebrae; tips of pelvic fin in most specimens not reaching anal fin; caudal fin truncate to subtruncate (Ref. 59155). Coloration: body grey or light brown, paler ventrally (Ref. 52307, 59155, 81260). Body scales in males with narrow dark margins; cheek, opercle and chest pale grey (Ref. 59155, 81260). Soft dorsal, anal and caudal fin membranes in males with some small dark maculae; spinous dorsal in ripe females silvery blue (Ref. 52307, 59155, 81260). Dorsal fin and upper part of caudal with reddish margin in both sexes, usually more marked in males; sometimes 4-5 dark vertical bars on the body, occasionally 2 horizontal bands (in juveniles); juveniles with a strongly marked black spot covering the first 2-3 spines and dorsal fin membrane (Ref. 59155, 81260).
Biology:  Found in middle sized or large rivers; small specimens prefer shallow regions and are found as single specimens or in small groups of 2-4 individuals between sunken wood or stones near the bank, while adults swim in deeper regions in the middle of the rivers (Ref. 59155). Diet consists mostly of detritus, aufwuchs and other, preferably vegetative, components (Ref. 52307).
IUCN Red List Status: Vulnerable (VU); Date assessed: 16 February 2009 (B2ab(iii)) Ref. (120744)
Threat to humans:  harmless
Country info:   

Entered by: Musschoot, Tobias - 24.10.07
Modified by: Musschoot, Tobias - 24.01.18

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