Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Alestidae
Etymology: Hydrocynus: Greek, hydr = water + Greek, kyon = dog (Ref. 45335).
Environment / Climate / Range
Freshwater; demersal; potamodromous (Ref. 51243). Tropical; 22°C - 28°C (Ref. 12468)
Length at first maturity / Size / Weight / Age
Maturity: Lm 39.8  range ? - ? cm
Max length : 105 cm FL male/unsexed; (Ref. 40637); 74.0 cm FL (female); max. published weight: 28.0 kg (Ref. 40637); max. reported age: 8 years (Ref. 2754)
soft rays: 15. Diagnosis: 2 scale rows between lateral line and scaly process at pelvic-fin bases; eye < 70% of interorbital space (Ref. 2880, 81279). Dorsal-fin origin at about same level as pelvic-fin insertions; tips of adipose and dorsal fins black; forked edge of caudal fin black (Ref. 2880, 80290, 81279).
West-Africa: Niger, Bénoué, Ouémé, Senegal (Ref. 2880, 5331, 7248, 81279), Ouémé (unconfirmed, Ref. 81279), Chad (Ref. 2880, 5331, 81279). Also found in the Volta (Ref. 5331, 81279) and Mono rivers (Ref. 81279).
Lower Guinea: Cross and Sanaga basins (Ref. 80290).
Also reported from Nile, Omo, Congo, Lufira, Lualaba, Luapula, Zambezi, Limpopo, Rovuma, Shire, Rufiji, Ruaha, Lake Bangweulu, Lake Mweru, Lake Tanganyika, Lake Upemba, Lake Rukwa (Ref. 2880, 80290), Lake Albert (Ref. 4903) and Lake Kariba (Ref. 27602), Malagarazi, Okavango and lower reaches of coastal systems south to Pongolo (Ref. 7248).
Prefers warm, well-oxygenated water, mainly larger rivers and lakes; all but the largest form roving schools of like-sized fish; aptly described as fierce and voracious; feeds on whatever prey is most abundant but Brycinus, Micralestes, Barbus, and Limnothrissa are favored (Ref. 7248). Useful food fish in some areas (Ref. 4967).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Paugy, D. and S.A. Schaefer, 2007. Alestidae. p. 347-411. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) Poissons d'eaux douces et saumâtres de basse Guinée, ouest de l'Afrique centrale/The fresh and brackish water fishes of Lower Guinea, west-central Africa. Vol. 1. Coll. Faune et Flore tropicales 42. Istitut de recherche pour le développement, Paris, France, Muséum nationale d'histoire naturelle, Paris, France and Musée royale de l'Afrique centrale, Tervuren, Belgique. 800 p. (Ref. 80290)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
Fisheries: commercial; gamefish: yes
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01096 (0.00857 - 0.01404), b=3.02 (2.95 - 3.09), based on LWR estimates for this species (Ref. 93245
Trophic Level (Ref. 69278
): 4.4 ±0.0 se; Based on diet studies.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (K=0.20-0.30; tmax=11).
Vulnerability (Ref. 59153
): Moderate vulnerability (41 of 100) .