分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Cichliformes (Cichlids, convict blennies)
鱸形目 (Cichlids, convict blennies) >
Cichlidae (Cichlids)
麗魚科 (Cichlids) > Pseudocrenilabrinae
Etymology: Placidochromis: Latin, placidus = of peaceful or tranquile appearance + Greek, chromis = a fish, perhaps a perch (Ref. 45335); borealis: From the Latin "borealis" = northern, named for its occurrence in the extreme north of Lake Malawi (Wissman Bay in Tanzania)(Ref. 55898).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性; 深度上下限 53 - 61 m (Ref. 55898). 热带
Africa: endemic to Lake Malawi, only known from Wissman Bay in Tanzania (Ref. 55898).
非洲: Wissman 海湾, 在坦尚尼亚的马拉威湖。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 6.5 cm SL 雄鱼/尚未辨别雌雄; (Ref. 55898)
简单描述
检索表 | 型态特徵 | 形态测量图
背棘 (总数) : 17; 背的软条 (总数) : 9; 臀棘: 3; 臀鳍软条: 8. Diagnosis: head length 35.7 %SL; snout length 30.4 % head length; snout pointed; lower jaw length 37.4 % head length; outer oral dentition well developed bicuspid; gape inclined at about 20° from horizontal; premaxillary pedicel length 26.5 % head length; cheek depth 22.6 % head length; eye diameter 34.8 % head length; body depth 37.2 %SL (Ref. 55898).
鉴别: 头长 35.7% SL; 吻的长度 30.4% 头长; 吻尖的; 下颌长度 37.4% 头长; 外部的口部生齿发展良好的二头齿; 口裂于大约 20个 ° 倾向从水平的; 上颌骨前的茎长度 26.5% 头长; 颊的深度 22.6% 头长; 眼直径 34.8% 头长; 体高 37.2% SL.(参考文献 55898)
描述: 相当延长种; 身体背部轮廓凸状; 几乎笔直地的腹面身体轮廓; 吻轮廓很直; 嘴中等的; 正好延伸至的颚骨超过垂直的在眼的前缘; 外部的口部齿二头齿; 内部的口部齿三尖瓣; 在颊上的 2 列鱗片; 眼的上緣幾乎碰觸頭部背面輪廓; 低的咽頜矮胖的; 一些中央的咽齒增大了與臼齒型; 在下肢短上的鰓耙.(參考文獻 55898)
體色 保護: 成熟的雄魚: 身體黃褐色的; 在背鰭之下的 7-8 縱帶; 吻與下巴深色的; 背鰭灰色的有狹窄的黑色靠近邊緣的條紋與白色的垂部與頂端; 柔軟背部有深灰色的斑點; 在動脈之間的薄膜上的臀鰭有深灰色的斑點; 臀鰭與腹鰭鰭有黑色的前緣。 (參考文獻 55898)
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
非洲: Wissman 海湾, 在坦尚尼亚的马拉威湖。
Hanssens, M., 2004. The deep-water Placidochromis species. p. 104-197. In J. Snoeks (ed.) The cichlid diversity of Lake Malawi/Nyasa/Niassa: identification, distribution and taxonomy. Cichlid Press, El Paso, USA. (Ref. 55898)
世界自然保护联盟红皮书 (Ref. 130435: Version 2024-2)
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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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
回复力 (Ref.
120179): 高度, 族群倍增时间少于 15个月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
