分类 / Names
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Teleostei >
Characiformes (Characins) >
Alestidae (African tetras)
Etymology: Micralestes: Greek, mikros = small + Greek,lestes = thief (Ref. 45335).
More on author: Peters.
Issue
Affinities: most similar to M. elongatus, from which it differs in the presence of multicuspid (vs conical, monocuspid) inner dentary teeth, inner premaxillary and outer dentary teeth with greater number of cusps and a slightly more robus body (Ref. 80290).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 大洋性; pH range: 6.2 - 8.0; dH range: ? - 25; 河川洄游 (Ref. 51243). 熱帶; 22°C - 26°C (Ref. 1672)
Africa: Congo, Okavango, Zambezi (Ref. 7248, 120641), Kunene and east coast rivers south to the Pongolo (Ref. 7248), Cross and Sanaga Rivers (Ref. 80290) and Tanzania (Ref. 4967). Nilo-Sudan and West-African reports of M. acutidens (e.g. Ref. 367, 51193) are misidentifications of M. elongatus (see DVD version of Ref. 81279; see also Ref. 2880).
非洲: 尼羅河，尼日，查德，剛果，尚比西河，凌波波河， Omo ， Ubanghi ，卡裡巴湖， Kafue ，貝南， Rovuma ，南非德蘭士瓦，喀麥隆，湖 Upemba ，盧阿拉巴河，偉萊河，貝努埃河。 也已知來自庫內內河與奧塔萬戈河流域。 (參考文獻 7248) 也發現於湖佛塔河，迦納 (參考文獻 3036) 與卡裡巴湖。 (參考文獻 27602)
Length at first maturity / 大小 / 重量 / 年龄
Maturity: Lm 3.4 range ? - ? cm
Max length : 9.0 cm SL 雄鱼/尚未辨别雌雄; (Ref. 4967); 最大体重: 2.00 g (Ref. 3799); 最大年龄: 3.00 年 (Ref. 7248)
背棘 (总数) : 0; 背的软条 (总数) : 10 - 11; 臀棘: 0; 臀鳍软条: 17 - 20. Diagnosis: inner dentary teeth multicuspid; 14-17 anal fin branched rays; dorsal fin apical tip black; scales of flank without melanophores concentrated along basal margin, pigment diffuse or absent (Ref. 80290).
身体高度 3-3.5 倍标准的长度.(参考文献 42032) 头长 3.6-4.2 倍标准的长度.(参考文献 42032) 犬齿数字: 上颌 3-5 的外部列，上颌 7-12 的内在列，下颌 9-11 的外部列, 下颌 2-4 的内在列.(参考文献 42032) 在鳃盖后面的黑色侧面中央的条纹出发很快地增大而且继续尾鳍的到起源。 (参考文献 42032) 鳍略灰色的, 与背鳍通常黑色的在它的末端.(参考文献 42032)
Shoals in clear, flowing or standing, open water; appears to co-exist with the tigerfish Hydrocynus forskalii in open water although it is heavily preyed upon by that predator, particularly those shoals of tigerfish ranging up to 45 cm in length (Ref. 13337). Omnivorous, often feeding from surface waters on winged insects; also takes insect larvae, crustaceans and eggs and fry of other fish (Ref. 13337). Matures after a year; partial spawner of moderate fecundity, with usually fewer than 700 eggs per female; shoals migrate upstream after first summer rains; breeds throughout the summer months; used as forage fish and as bait for tigerfish and pike (Ref. 7248).
游入清澈的，流动的或不动的, 开放水域。 跟共出现以虎鱼 Hydrocynus forskalii 存在在开放的水域中虽然它很重地被被那一个掠食者捕食，但是特别地那些分布达到 45 cm 长的虎鱼的鱼群.(参考文献 13337) 杂食性,在有翼的昆虫上时常从水表面进食。 也吃昆虫幼生, 甲壳动物与卵而且其他鱼油炸。 (参考文献 13337) 在一年之后成熟。 一个中等孕卵数的在局部时间产卵的鱼类,通常具有少于 700个每母鱼卵。 浅滩向上游移动在第一个之后夏天雨; 整个夏天数个月期间繁殖。 用作了饵料鱼而且当作钓虎鱼的鱼饵而且用矛刺杀。 (参考文献 7248)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
非洲: 尼羅河，尼日，查德，剛果，尚比西河，凌波波河， Omo ， Ubanghi ，卡裡巴湖， Kafue ，貝南， Rovuma ，南非德蘭士瓦，喀麥隆，湖 Upemba ，盧阿拉巴河，偉萊河，貝努埃河。 也已知來自庫內內河與奧塔萬戈河流域。 (參考文獻 7248) 也發現於湖佛塔河，迦納 (參考文獻 3036) 與卡裡巴湖。 (參考文獻 27602)
Skelton, P.H., 1993. A complete guide to the freshwater fishes of southern Africa. Southern Book Publishers. 388 p. (Ref. 7248)
人类利用
渔业: 没有兴趣; 水族馆: 商业性; 诱饵: usually
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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=0.01230 (0.00684 - 0.02212), b=3.10 (2.94 - 3.26), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
营养阶层 (Ref.
69278): 2.9 ±0.33 se; based on food items.
Generation time: 1.8 ( na - na) years. Estimated as median ln(3)/K based on 2
growth studies.
回复力 (Ref.
120179): 高度, 族群倍增时间少于 15个月 (K=0.63; tmax=3).
Fishing Vulnerability (Ref.
59153): Low vulnerability (23 of 100).
