分類 / Names
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Teleostei >
Characiformes (Characins)
脂鯉目 (Characins) >
Alestidae (African tetras)
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
生態學
; 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 / 年齡
Maturity: Lm 3.4 range ? - ? cm
Max length : 9.0 cm SL 雄魚/尚未辨別雌雄; (Ref. 4967); 最大體重: 2.00 g (Ref. 3799); 最大年齡: 3.00 年 (Ref. 7248)
背棘 (總數) : 0; 背的軟條 (總數) : 10 - 11; 臀棘: 0; 臀鰭軟條: 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).
身體高度 3-3.5 倍標準的長度.(參考文獻 42032) 頭長 3.6-4.2 倍標準的長度.(參考文獻 42032) 犬齒數字: 上頜 3-5 的外部列，上頜 7-12 的內在列，下頜 9-11 的外部列, 下頜 2-4 的內在列.(參考文獻 42032) 黑色的側面中央的條紋出發在後鰓蓋很快地增大而且繼續尾鰭的到起源。 (參考文獻 42032) 鰭略灰色的, 與背鰭通常黑色的在它的末端.(參考文獻 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﹐流動的或不動的, 開放水域。 跟共出現以虎魚 Hydrocynus forskalii 存在在開放的水域中雖然它很重地被被那一個掠食者捕食，但是特別地那些分佈達到 45 cm 長的虎魚的魚群.(參考文獻 13337) 雜食性,在有翼的昆蟲上時常從水表面進食。 也吃昆蟲幼生, 甲殼動物與卵而且其他魚油炸。 (參考文獻 13337) 在一年之後成熟。 一個中等孕卵數的在局部時間產卵的魚類,通常具有少於 700個每母魚卵。 淺灘向上游移動在第一個之後夏天雨; 整個夏天數個月期間繁殖。 用作了餌料魚而且當作釣虎魚的魚餌而且用矛刺殺。 (參考文獻 7248)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
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)
人類使用
漁業: 沒有興趣; 水族館: 商業性; 誘餌: 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).
營養階層 (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.
回復力 (Ref.
120179): 高度, 族群倍增時間少於 15個月 (K=0.63; tmax=3).
Fishing Vulnerability (Ref.
59153): Low vulnerability (23 of 100).
