分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Characiformes (Characins) >
Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335); usongo: Named in honor of Dr. Leonard Usongo, highly successful conservation biologist and supporter of numerous fish inventories in Cameroon (Ref. 80507).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性. ; 6°N - 5°N, 6°E - 10°E
Africa: Cross River and Niger Delta (Ref. 80507).
大小 / 重量 / 年龄
Maturity: Lm ?  range ? - ? cm
Max length : 4.4 cm SL 雄鱼/尚未辨别雌雄; (Ref. 80507)
简单描述
型态特徵 | 形态测量图
背棘 (总数): 0; 背的软条 (总数): 10-14; 臀棘 0; 臀鳍软条: 10 - 12. Diagnosis: Nannocharax usongo is distinguished from all other described Nannocharax species by its very small distance between the posterior border of the anus and the articulation of first anal-fin ray (0.9–1.9 vs. 2.2–14.2% of standard length), its body coloration, which consist of 7–11 mostly big blotches along the lateral line often coalesced to one wide black band, and 7–12 small blotches along the dorsum (Ref. 80507).
Type specimens collected on logs in areas of relatively rapid water movement; logs had a very rugged surface due to being partially decomposed by wood eating Povilla (Ephemeroptera) larvae; individuals were spaced singly and moved very rapidly around log surface, but always with close contact to it and never reaching out into the free water column; first ray of pelvic fin very thick, which is adaptation to cling on wood in strong current; mouth subinferior and blunt (Ref. 80507).
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
Dunz, A.R. and U.K. Schliewen, 2009. Description of two new species of Nannocharax Günther, 1867 (Teleostei: Characiformes: Distichodontidae) from the Cross River, Cameroon. Zootaxa 2028:1-19. (Ref. 80507)
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俗名同种异名新陈代谢捕食者生态毒物学繁殖成熟度产卵场产卵群集孕卵数卵卵的发育
年龄范围成长体长-体重体长-体长体长-频率形态测量图型态特徵仔鱼稚鱼动力学入添量丰度BRUVS
参考文献养殖养殖信息品种遗传学Electrophoreses遗传率疾病加工NutrientsMass conversion
合作者照片Stamps, Coins Misc.声音神经毒速度泳型鳃区Otoliths脑重体重比眼睛色素
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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=0.00380 (0.00147 - 0.00981), b=3.11 (2.88 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).