分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Siluriformes (Catfishes) >
Pangasiidae (Shark catfishes)
Etymology: Helicophagus: Greek, helike = spiral + Greek, phagein = to eat (Ref. 45335).
More on authors: Ng & Kottelat.
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 居于水底的. 熱帶
Asia: Chao Phraya and Mekong River drainages in Indochina.
亞洲: 湄南河與在印度支那的湄公河流域。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 47.2 cm SL 雄鱼/尚未辨别雌雄; (Ref. 43281)
背棘 (总数) : 1; 背的软条 (总数) : 6 - 7; 臀鳍软条: 35 - 42; 脊椎骨: 46 - 48. Can be differentiated from all its congeners by the following combination of characters: length of anal-fin base 34.5-38.2% SL, length of caudal peduncle 12.9-15.3% SL, head length 20.8-22.8% SL, eye diameter 16.1-21.2% HL, 9-12 gill rakers on the first branchial arch (Ref. 39387). Snout relatively elongate, conical in dorsal view; mouth narrow, with 20-25 times in SL; posterior nostril midway between anterior nostril and eye (Ref. 43281).
能在组合特徵之后被从它所有的同类区别藉由: 臀鳍基底 34.5-38.2% SL 的长度，尾柄 12.9-15.3% SL ，头长 20.8-22.8% SL 的长度, 眼直径 16.1-21.2% HL,9- 在第一个鳃弓上的 12个鳃耙.(参考文献 39387) 吻相当延长, 锥形从背面观察; 嘴狭窄的, 随着标准体长比率 20-25; 在前鼻孔与眼之间的后鼻孔中途.(参考文献 43281)
Occurs in permanent river channels and does not move into flooded areas. Migrates upstream when water levels begin to rise at the beginning of the flood season and moves downstream as the water clears at the end of the flood season. Feeds predominantly on bivalves.
出现于永久的河道与不会移进洪泛区中。 在洪水季节的起点水位开始上升的时候时溯河回游而且降河移动当水清澈的在洪水季节结束的时候。 主要捕食二枚贝。
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
亞洲: 湄南河與在印度支那的湄公河流域。
Ng, H.H. and M. Kottelat, 2000. Helicophagus leptorhynchus, a new species of molluscivorous catfish from Indochina (Teleostei: Pangasiidae). Raffles Bull. Zoll. 48(1):55-58. (Ref. 39387)
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00457 (0.00217 - 0.00962), b=3.09 (2.90 - 3.28), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
营养阶层 (Ref.
69278): 2.8 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (43 of 100).
