分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Gymnotiformes (Knifefishes)
電鰻目 (Knifefishes) >
Sternopygidae (Glass knifefishes)
胸肛魚科 (Glass knifefishes)
Etymology: Sternopygus: Greek, sternon = sternon, + Greek, pyge = tail (Ref. 45335); branco: Specific epithet from the Portuguese word meaning white, referring to the characteristic pale color of freshly netted live specimens; noun in apposition..
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 底中水層性. 熱帶
South America: Amazon River, Brazil.
南美洲: 亞馬遜河巴西。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 49.2 cm TL 雄魚/尚未辨別雌雄; (Ref. 52797)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
臀鰭軟條: 250 - 340.
Occurs in the main channels of major rivers or side branches; not known to occur in seasonally inundated floodplain forests or in forest steams of the Amazon's terra firme. In the Tefé region, this species is caught with beach seines and trawl nets at depth up to 10 meters in areas with weak currents, such as in large eddies, sheltered bays or "paranás" (side-branches of the main river channels that wind their way through the whitewater "várzea" floodplain); occurs syntopically with Sternopygus macrurus in whitewater habitats, but never with Sternopygus atrabes. This species does not occur where currents near the substrate exceeded 0.1 m/sec. At daytime it is usually encountered near submerged structures such as fallen trees and driftwood, and at night it moves into shallower water and away from structures. Specimens are collected on both sand and mud bottoms. It does not live in groups as indicated by electrode surveys and its sporadic occurrence in nets. Sexually mature males were never encountered, but gravid females were found along the edge of whitewater floodplain areas and in paraná channels during the rising water months of January and February. Feeds mainly on autochthonous insect larvae which it encounters on the substrate; the presence of small pieces of wood in many of the stomachs indicate that it forages among organic detritus on the river bed rather than within rafts of floating meadows or marginal macrophytes (Ref. 55493).
出現於主要河的主水道或支流; 不知道季節性地出現在浸水了洪泛區森林或在亞馬遜河的地 firme 的森林蒸氣中。 在 Tefe 區域中，這種被用海灘圍網與拖網捕獲在深度達到 10 公尺在有弱的水流的區域中, 例如大的渦流, 掩蔽的海灣或者 " paranas";(轉動的主要河道的支流他們的方法經過白水的 " varzea" 洪泛區) 出現在白水的棲息地與 Sternopygus macrurus 有鄰接關係, 但是從不以 Sternopygus atrabes. 這種不會出現在底部附近的水流在它通常是在水下的結構附近見到例如落下來的樹與流木的白天超過了 0.1 公尺/秒的地方,而在它移入較淺的水域而且遠離結構的夜晚。 標本在兩者的沙與泥底部上被收集。 在網中的如電極調查與它的分散發生所指出的它不會群居生活。 性成熟的雄魚從不被見到, 但是懷孕的雌性被發現沿著白水洪泛區區域的邊緣與在 parana 峽道中在上升的水數個月的一月與二月期間。 主要吃土生土長的昆蟲幼生它在底部上的相會; 那有在許多腹部中的小木材指出，它在河床上的有機碎屑之中覓食而不是在漂浮草地或邊緣的大型植物的筏裡面.(參考文獻 55493)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
南美洲: 亞馬遜河巴西。
Crampton, W.G.R., K.G. Hulen and J.S. Albert, 2004. Redescription of Sternopygus obtusirostris (Gymnotiformes: Sternopygidae) from the Amazon basin, with description of osteology, ecology and electric organ discharges. Ichthyol. Explor. Freshwat. 15(2):121-134. (Ref. 52797)
IUCN 瀕危狀態 (Ref. 130435)
無危 (LC) ; Date assessed: 03 December 2020
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5020 [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).
營養階層 (Ref.
69278): 2.6 ±0.27 se; based on food items.
Fishing Vulnerability (Ref.
59153): Moderate vulnerability (39 of 100).
