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Brachyalestes sadleri (Boulenger, 1906)

Sadler's robber
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Brachyalestes sadleri
Picture by Seegers, L.

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> Characiformes (Characins) > Alestidae (African tetras)
Eponymy: Colonel Sir James Hayes Sadler (1827–1910) was a British Army officer who served in a number of artillery regiments (1854–1882). [...] (Ref. 128868), visit book page.
More on author: Boulenger.

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

; 新鮮な水 外洋の. 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: Lakes Victoria, Kyoga and Nabugabo; Victoria Nile, Malawa River (Ref. 4903, 34290) and Middle Akagera (Ref. 46152). Also reported from Aswa River (Ref. 4903), Lake Rukwa basin (Ref. 27292) and Malagarazi River (Ref. 54847, 98755).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 13.8 cm TL オス/雌雄の選別がない; (Ref. 27292)

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) : 10; 肛門の骨: 0; 臀鰭: 20 - 21. Anal fin margin of females straight or very slightly concave; markedly convex in males (individual rays are stouter and coarser than those of females). Silver, bluish to black dorsally; silver longitudinal band running from behind the operculum to the caudal peduncle, where it merges with an irregular black blotch which extends to the caudal fin base. All fins grey in color; other specimens all yellowish (except for pectorals). Dorsal adipose fin bright orange (Ref. 34290).

生物学     用語集 (例 epibenthic)

In Lake Victoria found in shallow inshore areas with papyrus and other aquatic vegetation (Ref. 34290). In Lakes Kyoga and Nabugabo amongst marginal vegetation; believed to run up rivers during rainy season to spawn (Ref. 4903). Present in lake and affluents in the Lake Rukwa basin (Ref. 27292). Feeds on aquatic plants and surface insects (chironomid pupae), rarely on fishes (Ref. 12526). Appears in small quantities in markets (Ref. 4967).

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

Seegers, L., 1996. The fishes of the Lake Rukwa drainage. Ann. Mus. R. Afr. Centr., Sci. Zool., 278:1-407. (Ref. 27292)

IUCNのレッドリストの状況は (Ref. 130435: Version 2024-1)

  軽度懸念 (LC) ; Date assessed: 24 September 2015

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業: 少数商業の
FAO - Publication: search | FishSource |

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インターネットの情報源

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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=0.01122 (0.00496 - 0.02540), b=3.01 (2.83 - 3.19), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.2   ±0.40 se; based on food items.
Generation time: 2.4 ( na - na) years. Estimated as median ln(3)/K based on 1 growth studies.
回復力 (Ref. 120179):  高い, １５か月以下の倍増期間の最小個体群 (K=4.6).
Fishing Vulnerability (Ref. 59153):  Low to moderate vulnerability (27 of 100).
価格帯 (Ref. 80766):   Unknown.