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Xenocharax crassus Pellegrin, 1900

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drawing shows typical species in Distichodontidae.

Congo (Brazzaville) country information

Common names: [No common name]
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: live export: yes;
Comments: Known from the middle Congo River basin (Ref. 114931) in the rivers Léfini (Ref. 114931), Alima (Ref. 52343, 114931), Likouala, Sangha and Likouala-aux-Herbes (Ref. 114931). Type locality of the holotype of Xenocharax crassus: 'Leketi (Alima moyen)' (Ref. 52343).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/cf.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Ibala Zamba, A., V. Mamonekene, E. Vreven and M.L.J. Stiassny, 2016
National Database:

Common names from other countries

Yelele, ... more

分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa

> Characiformes (Characins) > Distichodontidae (Distichodus)
Etymology: Xenocharax: Greek, xenos = strange + Greek, charax = a marine fish without identification (Ref. 45335).

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

; 新鮮な水 底生の漂泳性.   Tropical

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: middle Congo River basin in Congo Republic (Ref. 52343, 114931), Democratic Republic of the Congo (Ref. 93897, 114931) and Cameroon (Ref. 114931).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 18.6 cm SL オス/雌雄の選別がない; (Ref. 124477)

簡単な記述 検索表 | 形態学 | 形態計測学

背面の脊椎 (合計) : 0; 背鰭 (合計) : 18 - 22; 肛門の骨: 0; 臀鰭: 13 - 15. Diagnosis: Xenocharax crassus is distinguished from Xenocharax spilurus by the presence of a large black mark located anteriorly on the dorsal fin, vs. absence; a small, round, black spot at the posterior half of the caudal peduncle and covering a total of 4 to 6 scales, ±2 to 3 scales in horizontal and vertical direction alike, vs. a large ovoid spot covering a total of about 35 to 46 scales, ±8 to 10 scales in horizontal and vertical direction alike; and a wider mouth, 29-34% of head length vs. 24-29% (Ref. 114931). In addition, for the specimens of similar sizes, X. crassus has a shorter dorsal-adipose distance than X. spilurus; further, most X. crassus specimens have 6 supraneurals vs. 7 in X. spilurus (Ref. 52343, 114931).

生物学     用語集 (例 epibenthic)

Found almost exclusively in forested tributaries or in savannah streams under dense gallery forest (Ref. 114931).

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

主な参考文献 Upload your references | 参考文献 | コーディネーター | 協力者

Pellegrin, J., 1900. Poissons nouveaux du Congo français. Bull. Mus. Natn. Hist. Nat., Paris, 6(3):98-101. (Ref. 52343)

IUCNのレッドリストの状況は (Ref. 130435)

  軽度懸念 (LC) ; Date assessed: 16 February 2009

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless




Human uses

FAO(Publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.7500   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02188 (0.01053 - 0.04545), b=3.04 (2.85 - 3.23), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
栄養段階 (Ref. 69278):  3.0   ±0.3 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153):  Low vulnerability (13 of 100).