Actinopterygii (ray-finned fishes) > Perciformes
(Perch-likes) > Cichlidae
(Cichlids) > Pseudocrenilabrinae
Etymology: Oreochromis: Latin, aurum = gold + Greek, chromis = a fish, perhaps a perch (Ref. 45335); karomo: Karomo is the local name of the species (Ref. 2).
Environment / Climate / Range
Freshwater; benthopelagic. Tropical; 22°C - 28°C (Ref. 2060); 4°S - 6°S
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 28.0 cm SL male/unsexed; (Ref. 4967)
(total): 15 - 16;
soft rays: 10 - 11;
Vertebrae: 29. Diagnosis: tasselled species (Ref. 2). Adults with all teeth of the jaws tricuspid (Ref. 2, 55074), with long, slender shafts and curved crowns, arranged in broad bands (Ref. 2). Jaws much enlarged, projecting forwards to form a long snout (Ref. 2), with the tooth bands meeting in the horizontal plane (Ref. 2, 4967). Maxilla with a flange resting on the premaxilla at the curve between its two arms (Ref. 2).
Africa: endemic to the Malagarasi River basin (Ref. 2, 53528, 54847).
Occurs at a temperature range of 21.5-29.0 °C; occasionally forms schools; is mainly diurnal (Ref. 2). Males were seen scooping algal debris from the bottom, occasionally moving to adjacent weed beds to rasp epiphytic algae; maternal mouthbrooder (Ref. 2, 55077). Excellent to eat; occurs in shallow water; common but localized (Ref. 53528). Important in swamp fishery (Ref. 4967).
Males construct and maintain a mating platform which is a circular area of fine sand (Ref. 2), usually only about 10-15cm in diameter which is much smaller than the length of the fish (Ref. 55077), surrounded by a low ridge, on the top of a mound about 10 cm high (Ref. 2), but the mound might be 1m in diameter at its base and 30cm high (Ref. 55074, 55077). The plaque of sand is kept very clean, making the nest visible from a considerable distance (Ref. 55077). Little boundary fighting between close neighbours, but males seen to drive away individuals of other species (e.g. Labeo and Clarias as well as other cichlids)(Ref. 2, 55077). Females are seen in the nests at various times throughout the day; the number of times a male spawns appears to be limited by the number of ripe females available; females cruise over the spawning grounds singly or in small shoals (Ref. 55077). Courtship behaviour short and not particularly complex (Ref. 364), including displaying by the male to attract a female, snout shaking (nose wagging) and tassel dragging (Ref. 364, 55077). Female lays a batch of eggs and immediately picks them up while the male drags his tassel over the nest (Ref. 2, 55077), but it remains unclear whether the eggs are fertilised in the water or in the mouth of the female (Ref. 55077). 2, 3 or more batches of eggs may be laid by the same female before she leaves the nest (Ref. 2, 55077), and the larger the female the more numerous the eggs (Ref. 55077). Normal spawning generally takes less than 5 minutes (Ref. 55077). Breeding individuals spend little time feeding (Ref. 2), and males do not leave their territory to feed (Ref. 5507). Young of 11mm still with large yolk sacs were the largest seen from the mouth of a female (Ref. 55077). Young of 2-6cm remain in schools in the shallows (Ref. 2, 55077).
Trewavas, E., 1983. Tilapiine fishes of the genera Sarotherodon, Oreochromis and Danakilia. British Mus. Nat. Hist., London, UK. 583 p. (Ref. 2)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
Fisheries: commercial; aquaculture: likely future use; aquarium: commercial
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01862 (0.00776 - 0.04469), b=3.00 (2.80 - 3.20), based on LWR estimates for this Subfamily-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 2.0 ±0.00 se; Based on food items.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (Fec=250).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (35 of 100) .