分类 / 名称
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Atheriniformes (Silversides) >
Bedotiidae (Madagascar rainbowfishes)
Etymology: Rheocles: Greek, rheos = stream + Greek, kles, kleis = straits; derhami: Named for Patrick de Rham, director of the Aquatic Conservation Network (Ref. 39832).
Eponymy: Dr Patrick Henri de Rham (d: 1936) is a Swiss zoologist, botanist, ichthyologist and aquarist in Lausanne, and was Expert Ecologist to the Coopération Technique Suisse. He is a Director of the Aquatic Conservation Network. (Also see Patrick and Rham) (Ref. 128868), visit book page.
环境：氛围 / 气候带 / 深度上下限 / 分布范围
生态学
; 淡水 大洋性. 熱帶
Africa: Madagascar.
非洲: 馬達加斯加。
大小 / 重量 / 年龄
成熟度: Lm ? range ? - ? cm
Max length : 5.0 cm SL 雄鱼/尚未辨别雌雄; (Ref. 39832)
背棘 (总数) : 2; 背的软条 (总数) : 14 - 19; 臀棘: 1; 臀鳍软条: 15 - 21; 脊椎骨: 35 - 38. Rheocles derhami is readily distinguished from R. sikorae and R. wrightae by length of upper jaw (32-41%HL versus 46-58) and absence of black pigmentation of genital papilla, from R. pellegrini by number of gill rakers on lower limb of first arch (9-10 versus 6-7), from R. lateralis by caudal peduncle length (67.3-78.6%SL versus 84.6-96.7), and from R. alaotrensis by absence of chest and belly scales and paired predorsal scale rows (Ref. 39832). In life males normally light grey, the second dorsal, anal and caudal fins are bright silvery blue, the throat region is orange-red, light grey females are not brightly colored; preserved specimens are creamy yellow, scale rows in dorsal midline heavily pigmented and darkened (Ref. 39832).
Body shape (shape guide): fusiform / normal.
Rheocles derhami 轻易地被区分 R. sikorae 与 上颌 (32-41% HL 对 46-58) 的长度 R. wrightae 而且缺乏生殖乳突的黑色颜色, 从 鳃耙的数字的 R. pellegrini 在第一鳃弓 (9-10 和 6-7 比较) 的下肢上, 从 尾柄长度 (67.3-78.6%SL 对 84.6-96.7) 的 R. lateralis, 与从 R. alaotrensis 被缺乏胸与腹面鳞片与成对的前背鳞片列.(参考文献 39832) 活着时雄性通常淡灰色, 第二个背鳍、臀鳍与尾鳍是明亮的银蓝色, 咽喉区域是橘红色又淡灰色的雌性不是色彩鲜艳的; 保存的标本是乳脂色的黄色, 在背部中线的鳞片列颜色深的而且颜色较深。 (参考文献 39832)
生命周期和交配行为
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
非洲: 馬達加斯加。
Stiassny, M.L.J. and D.M. Rodriguez, 2001. Rheocles derhami, a new species of freshwater rainbowfish (Atherinomorpha: Bedotiidae) from the Ambomboa River in northeastern Madagascar. Ichthyol. Explor. Freshwat. 12(2):97-104. (Ref. 39832)
世界自然保护联盟红皮书 (Ref. 130435: Version 2025-2 (Global))
极度濒危 (CR) (A2ac; B1ab(iii,v)); Date assessed: 21 June 2016
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基于模型的估算
系统发育多样性指数 (参考文献
82804): PD
50 = 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (参考文献
69278): 3.2 ±0.40 se; based on food items.
渔业脆弱性 (Ref.
59153): Low vulnerability (10 of 100).
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