分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Cichliformes (Cichlids, convict blennies)
鱸形目 (Cichlids, convict blennies) >
Cichlidae (Cichlids)
慈鯛科魚類 (Cichlids) > Pseudocrenilabrinae
Etymology: nigrans: The specific epithet, nigrans, is a Latin adjective, meaning dark(ly) coloured (Ref. 85854).
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 底中水層性.
Africa: Lake Ejagham in Cameroon (Ref. 85854).
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 15.3 cm SL 雄魚/尚未辨別雌雄; (Ref. 85854)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
背棘 (總數) : 14 - 16; 背的軟條 (總數) : 11 - 13; 臀棘: 3; 臀鰭軟條: 8 - 9. Diagnosis: Coptodon nigrans differs from all Tilapia sensu lato, and Coptodon, except for a few members, in quadricuspid to pentacuspid posterior pharyngeal teeth on lower pharyngeal jaw; quadricuspid teeth are known from C. tholloni, C. cameronensis, C. dageti, C. congica, C. deckerti, and partially from C. ejagham (Ref. 85854). It differs from C. cameronensis, C. ismailiaensis and C. dageti in longer lower jaw, 13.9-17.3% of standard length vs. 9.6-13.2%; from C. tholloni in longer snout length, 15.8-18.2% of standard length vs. 11.7-14.6%; from C. congica in lesser body depth, 34.9-40.2% of standard length vs. 41.5-49.2%; and from C. kottae in narrower interorbital width, 10.0-11.8% of standard length vs. 12.4-14.0% (Ref. 85854). Differences to C. deckerti are based on a combination of morphometric, life history, genetic and ecological data, e.g. in longer snout length, 15.8-18.2% vs. 12.7-15.6%, by breeding exclusively in excavated caves below 5 m water depth, vs. always breeding above 2 m; the smallest reproductvely active specimens of C. nigrans are larger than largest reproductively active C. deckerti specimen (Ref. 85854). it differs from C. ejagham in dark square-shaped blotches at base of each flank scale, filled or with a light coloured window at centre of blotch, vs. flank scales with a dark scale margin and a light centre, especially on scales below lateral line (Ref. 85854).
This species breeds exclusively in excavated caves below 5 m depth (Ref. 85854).
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
Dunz, A.R. and U.K. Schliewen, 2013. Molecular phylogeny and revised classification of the haplotilapiine cichlid fishes formerly referred to as "Tilapia". Mol. Phylogenet. Evol. 68(1):64-80. (Ref. 93285)
IUCN 瀕危狀態 (Ref. 130435: Version 2024-2)
極危 (CR) (B1ab(iii)+2ab(iii)); Date assessed: 09 March 2023
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01862 (0.00830 - 0.04177), b=3.01 (2.82 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (Ref.
69278): 2.6 ±0.1 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
