Oreochromis macrochir, Longfin tilapia : fisheries, aquaculture, gamefish

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Oreochromis macrochir (Boulenger, 1912)

Longfin tilapia
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Oreochromis macrochir
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Classification / Names Nomi Comuni | Sinonimi | Catalog of Fishes(Genere, Specie) | ITIS | CoL | WoRMS | Cloffa

> Cichliformes (Cichlids, convict blennies) > Cichlidae (Cichlids) > Pseudocrenilabrinae
Etymology: Oreochromis: Latin, aurum = gold + Greek, chromis = a fish, perhaps a perch (Ref. 45335);  macrochir: From the Greek "macros" = big and the Greek "cheir" = hand, or pectoral fin in fishes, referring to the large pectoral fin (Ref. 52307).
More on author: Boulenger.

Environment: milieu / climate zone / depth range / distribution range Ecologia

; acqua dolce benthopelagico; distribuzione batimetrica 5 - 14 m (Ref. 58302). Tropical; 18°C - 35°C (Ref. 54042); 5°N - 25°S

Distribuzione Stati | Aree FAO | Ecosystems | Presenze | Point map | Introduzioni | Faunafri

Africa: Kafue, upper Zambezi, and Congo River systems, introduced elsewhere in Africa and in Hawaiian Islands. Also in the Okavango and Ngami region, Cunene basin, Chambezi and Bangweulu region (Ref. 5166).

Length at first maturity / Size / Peso / Age

Maturity: Lm 15.6, range 18 - 18 cm
Max length : 43.0 cm TL maschio/sesso non determinato; (Ref. 54097)

Short description Morfologia | Morfometria

Spine dorsali (totale): 15 - 17; Raggi dorsali molli (totale): 11-14; Spine anali 3; Raggi anali molli: 9 - 12; Vertebre: 29 - 32. Diagnosis: head profile steep (Ref. 2, 7248, 12524, 13337, 33478, 52193, 54167) and rounded (Ref. 315, 12524). Toothed area of lower pharyngeal bone with broadly rounded lobes; scales on cheek in 2-3 rows; caudal scales variable, not on the inter-radial membranes except at the base, and never stiffening the fin (Ref. 2). Adults with black (Ref. 2, 12524) or dark brown flecks in the temporal region, on the gill-cover (Ref. 2, 11970) and below the eye, mostly associated with openings of the lateral line system (Ref. 2). Adults without conspicuous mid-lateral blotches (Ref. 2).

Biologia     Glossario (es. epibenthic)

Prefers quiet, deep water associated with aquatic vegetation, but has been collected in other habitats as well (Ref. 12524, 13337). Found at temperatures between 18 and 35°C (Ref. 54042). Has a very low salinity tolerance (Ref. 2, 58). Occasionally forms schools, is mainly diurnal (Ref. 2). Feeds mostly on detritus (Ref. 87, 7248, 44661, 52193, 52307, 56192), (blue-green) algae (Ref. 12524, 13337, 44661) and diatoms (Ref. 246, 7248, 12524, 13337, 52193). Juvenile also accepts small invertebrates and zooplankton (Ref. 7248, 52193, 52307), but lose this tendency with age (Ref. 52307). Maternal mouthbrooder (Ref. 87, 246, 314, 5214, 7248, 8600, 12524, 13337, 36094, 52193, 54042). Mating territory having a central volcano-shaped mound (Ref. 2, 246, 314, 5214, 12524, 55074) with a flat or slightly concave top, surrounded by a ditch and vallum, in contrast to O. mweruensis (Ref. 2). Flesh excellent (Ref. 5214).

Life cycle and mating behavior Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve

Breeds in summer (Ref. 2, 7248, 52193). The reproductive season lasts from September to March in the southern regions of the species distribution (Ref. 52307). Males construct (Ref. 2, 13337) and defend (Ref. 2) a nest in shallowish waters (Ref. 2, 13337), which is a central volcano-shaped mound (Ref. 2, 314, 364, 5214, 13337, 55074) with a flat or slightly concave top which is the mating platform, surrounded by a ditch and vallum (groove and boundary wall) (Ref. 2). The cone is higher than the boundary wall of the territory (Ref. 2). Spawns in waters up to 150 (Ref. 2) or 300 (Ref. 52307) cm deep, along banks of the lakes/river (Ref. 2). Males court several females in succession and females may mate with more than one male in a summer, so that large populations of young may build up (Ref. 5214, 52307). Several nests are often grouped into an arena (Ref. 5214, 7248, 36094, 52193). If a male can successfully attract a female to his pit, both fish will swim to the center of the nest; the female then deposits her eggs - about 10-50 per spawn - and the male, possessing tassel-like genital papilla approximately 25 mm in length, swims over the eggs; the female touches the male's tassels with her lips, stimulating him to fertilize the eggs; surely part of the sperm will fertilize the eggs in the female's mouth, but the majority of the fertilization takes place outside, in the crater of the nest; Wickler (1966) wrote that he observed a spermatophore-like structure in this species but Trewavas (1983) wrote that it was more likely a filament of the genital papilla, as she did not observe any spermatophores in this species under natural conditions; pair-bonding does not take place, as partners are only together during spawning; in the wlld, females have been observed spawning with one male and then seeking others out to continue spawning with, in the end brooding some eggs from each; depending on its size, a female can carry up to 1300 eggs in her mouth; eggs have a diameter of 3 mm and are greenish-brown in color; a female can raise multiple broods per season, at about 5·week intervals; brooding females prefer to hide in regions with thick vegetation and cover; fry may initially leave the mother's mouth even before yolk sack is totally absorbed, but remain close together and are reincubated by the mother at night or when threatened; after about 21 days, the babies (about 20 mm long) leave their mother; they spend their earliest days in the shallow waters near the banks, or in other regions that contain plenty of shelter; once they increase in size, they will begin to venture out into more open water (Ref. 52307).

Main reference Upload your references | Bibliografia | Coordinatore : Kullander, Sven O. | Collaboratori

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. 130435)

  Vulnerabile, vedi Lista Rossa IUCN (VU) (A3e); Date assessed: 01 March 2007

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Pesca: commerciale; Acquacoltura: commerciale; Pesce da pesca sportiva: si
FAO - Acquacoltura: production; ; Publication: search | FishSource |

Informazioni ulteriori

Nomi Comuni
Sinonimi
Metabolismo
Predatori
Ecotossicologia
Riproduzione
Maturità
Deposizione
Spawning aggregation
Fecundity
Uova
Egg development
Age/Size
Accrescimento
Length-weight
Length-length
Length-frequencies
Morfometria
Morfologia
Larve
Dinamica popolazioni larvali
Reclutamento
Abbondanza
BRUVS
Bibliografia
Acquacoltura
Profilo di acquacoltura
Varietà
Genetica
Electrophoreses
Ereditarietà
Malattie
Elaborazione
Nutrients
Mass conversion
Collaboratori
Immagini
Stamps, Coins Misc.
Suoni
Ciguatera
Velocità
Modalità di nuoto
Area branchiale
Otoliths
Cervelli
Vista

Strumenti

Special reports

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Fonti Internet

AFORO (otoliths) | Alien/Invasive Species database | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: Genere, Specie | DiscoverLife | ECOTOX | FAO - Acquacoltura: production; ; Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Go, ricerca | World Records Freshwater Fishing | Zoological Record

Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01549 (0.00881 - 0.02723), b=3.00 (2.85 - 3.15), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).
Trophic level (Ref. 69278):  2.1   ±0.0 se; based on diet studies.
Generation time: 2.6 (1.1 - 4.0) years. Estimated as median ln(3)/K based on 12 growth studies.
Resilienza (Ref. 120179):  Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (K=0.23-1.0; tm<1).
Fishing Vulnerability (Ref. 59153):  Low to moderate vulnerability (35 of 100).
Price category (Ref. 80766):   Unknown.
Nutrients (Ref. 124155):  Calcium = 15.1 [6.2, 80.0] mg/100g; Iron = 1.22 [0.57, 2.91] mg/100g; Protein = 18.1 [16.4, 19.9] %; Omega3 = 0.347 [0.123, 0.961] g/100g; Selenium = 66.1 [25.9, 145.8] μg/100g; VitaminA = 19.7 [4.5, 80.8] μg/100g; Zinc = 2.07 [1.15, 4.89] mg/100g (wet weight);