Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Alestidae
Etymology: Bathyaethiops: Greek, bathys = deep + Greek, Aethiopia, an African country (Ref. 45335); atercrinis: Ater, from the Latin, meaning black or dark, and crinis, in the sense of the tail of a comet; named in reference to the striking black marking of the caudal peduncle and anal fin of mature males (Ref. 91757).
Environment / Climate / Range
Freshwater; pelagic; pH range: 7.6 - 7.6. Tropical; 21°C - 23°C (Ref. 91757), preferred ?
Africa: Only known from Lékoumou River, a small tributary of the Louessé River in the Kouilou-Niari basin (Ref. 91757).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 4.0 cm SL male/unsexed; (Ref. 91757)
Morphology | Morphometrics
soft rays: 18 - 20;
Vertebrae: 33 - 35. Diagnosis: This species is distinguished from congeners by the possession of 21-24 scales in the longitudinal series vs. 28-42 scales, and from Brachypetersius altus by the possession of a short, abridged lateral line of 6 or 7 pored scales vs. a complete lateral line of 20-28 pored scales (Ref. 91757). Unique among related taxa in displaying marked sexual dichromatism, and dimorphism of the anal-fin skeleton; with medially expanded first anal-fin pterygiophores, markedly enlarged branched anal-ray segments, and strongly convex anal-fin profiles characterizing males; they also display a distinctive black blotch extending from just above midline behind the dorsal fin and passing ventrally over the anal fin (Ref. 91757).
Fishes of this species were caught close to the bank of the river, at a depth of about 1 meter over sand and mud (Ref. 91757). Water temperature in the shallows where most specimens were collected was between 21.0-22.5°C and pH 7.6 (Ref. 91757). Water very turbid and current moderately rapid; indications of reproductive activity in December (Ref. 91757).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Mamonekene, V. and M.L. Stiassny, 2012. A new Bathyaethiops (Characiformes: Alestidae) from the Lékoumou River (Kouilou-Niari Basin) in the Republic of Congo; First record of the genus in the Lower Guinean Ichthyofaunal Province. Copeia 2012(3):478-483. (Ref. 91757)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00512 - 0.02461), b=3.00 (2.81 - 3.19), based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.1 ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .