Oreochromis grahami, Magadi tilapia : fisheries, aquarium

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Oreochromis grahami (Boulenger, 1912)

Magadi tilapia
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Oreochromis grahami
Male picture by Seegers, L.

分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, ) | 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).
More on author: Boulenger.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の漂泳性; pH range: 7.5 - 8.5; dH range: 10 - 20. Tropical; 24°C - 32°C (Ref. 2060); 1°S - 2°S

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

Africa: Lake Magadi in Kenya (Ref. 52331). Introduced in Lake Nakuru and Lake Elmenteita, both in Kenya (Ref. 52331). Reported as introduced to Lake Natron in Tanzania (Ref. 13364), but there is currently no evidence that any introduction led to establishment of breeding populations (Ref. 118638).

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm ?, range 3 - ? cm
Max length : 20.0 cm SL オス/雌雄の選別がない; (Ref. 2)

簡単な記述 形態学 | 形態計測学

背面の脊椎 (合計): 11 - 13; 背鰭 (合計): 12-13; 肛門の骨 3; 臀鰭: 9 - 11; 脊つい: 28. Mature females with an overall golden hue; males with the flanks a pale blue. Swollen and brilliant white lateral parts of the lower lip of the mature male. Blue spots on scales becoming iridescent. Genital papilla conical, prominent and yellow in the mature male; swollen in the mature female. An oblique eye-bar intensely black in the breeding male, duller in the female.

生物学     用語集 (例 epibenthic)

Facultative air-breathing (Ref. 126274); Occur at temperatures ranging from 16.0-40.0 °C (Ref. 2). Feed actively in the evening. Young O. alcalicus grahami eat eggs as they are shed by the female, and much of the time and energy of the territorial male is occupied in driving them off. Feed on invertebrates, at the surface (Ref. 2).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

Male prepares a breeding pit, the structure of which may vary with the nature of the substratum. Breeding activities are more actively pursued by both sexes in the morning than in the afternoon. Female lays about 3-10 eggs at a time, picks them up instantly and the male swims with his genital papilla near the mouth, probably emitting sperm. Brooding period reportedly 12-16 days.

主な参考文献 Upload your references | 参考文献 | コーディネーター : Kullander, Sven O. | 協力者

Seegers, L. and H. Tichy, 1999. The Oreochromis alcalicus flock (Teleostei: Cichlidae) from lakes Natron and Magadi, Tanzania and Kenya, with descriptions of two new species. Ichthyol. Explor. Freshwat. 10(2):97-146. (Ref. 32272)

IUCNのレッドリストの状況は (Ref. 130435)

  絶滅危惧 (EN) (B1ab(i,ii,iii)); Date assessed: 16 June 2022

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業: ; 水族館・水槽: 商業
FAO - Publication: search | FishSource |

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シガテラ(食中毒の名前)
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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5625   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01905 (0.00827 - 0.04391), b=3.01 (2.82 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  2.8   ±0.28 se; based on food items.
回復力 (Ref. 120179):  高い, 15か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (14 of 100).
価格帯 (Ref. 80766):   Unknown.