分类 / Names
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Teleostei >
Siluriformes (Catfishes) >
Akysidae (Stream catfishes) > Akysinae
Etymology: alfredi: Named for Eric R. Alfred, for his pioneering work on the freshwater fish fauna of Peninsular Malaysia..
More on authors: Ng & Kottelat.
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性. 熱帶
Asia: Tasek Bera in Malaysia.
亞洲: 在馬來西亞的 Tasek Bera。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 3.0 cm SL 雄鱼/尚未辨别雌雄; (Ref. 30226)
简单描述
检索表 | 型态特徵 | 形态测量图
背的软条 (总数) : 5 - 6; 臀鳍软条: 8 - 10; 脊椎骨: 32 - 33. Distinguished from all its congeners by possessing tubercles with poorly-demarcated, indistinct margins (versus tubercles with well-demarcated and distinct margins) and the following combination of characters: head width 20.3-25.0% SL; body depth at anus 11.3-14.7% SL; depth of caudal peduncle 5.7-7.3% SL; pectoral-fin length 23.1-28.9% SL; interorbital distance 34-39% HL; eye diameter 7-11% HL; length of nasal barbel 29-65% HL; length of maxillary barbel 122-144% HL; length of outer mandibular barbel 88-134% HL; color pattern of dark-colored patches on a predominantly light-colored body (versus predominantly dark-colored body with light-colored patches in its congeners); and caudal fin strongly forked (Ref. 30226).
藉由用贫乏定界线又不明显的边缘 (对小瘤以很好定界线与明显的边缘) 与下列的组合特徵持有小瘤与它所有的同类区分了: 头部宽度 20.3-25.0% SL; 在肛门 11.3-14.7% SL 的体高; 尾柄 5.7-7.3% SL 的深度; 胸鳍长度 23.1-28.9% SL; 眼间距 34-39% HL; 眼直径 7-11% HL; 鼻触须 29-65% HL 的长度; 颚触须 122-144% HL 的长度; 外部颚的触须 88-134% HL 的长度; 深色区块的彩色斑纹一之上主要颜色较淡身体;(对主要深色的身体有颜色较淡区块在它的同类中) 而且尾鳍强烈地分岔.(参考文献 30226)
Recorded from small slow-flowing forested streams with acidic water (Ref. 84801).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
亞洲: 在馬來西亞的 Tasek Bera。
Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628. (Ref. 58032)
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.3 ±0.6 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
