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Sternopygus macrurus (Bloch & Schneider, 1801)

Longtail knifefish
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Sternopygus macrurus
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Brazil country information

Common names: Itui, Ituí, Lampreia preta
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: live export: yes;
Comments: Occurs in the Amazon and Sao Francisco River. Recorded from Córrego Barreiro (Ref. 53011), Machado (Ref. 97589) and Acre River basins (Ref. 97592).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/br.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: Albert, J.S., 2003
National Database:

Common names from other countries

Poisson-couteau, Bio del rio, Tuvira, ... more

分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa

> Gymnotiformes (Knifefishes) > Sternopygidae (Glass knifefishes)
Etymology: Sternopygus: Greek, sternon = sternon, + Greek, pyge = tail (Ref. 45335).
  More on authors: Bloch & Schneider.

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の漂泳性; pH range: 6.0 - 6.5; dH range: 4 - 15.   Tropical; 22°C - 28°C (Ref. 2059)

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

South America: Magdalena River basin; entire extent of the Amazon and Orinoco River basins below approximately 500 m elevation including Napo River of western Ecuador and Madre de Dios River of Peru; all drainages of the Guianas Shield; Atlantic drainages of northeastern Brazil (Tocantins, Parnaíba, Pindaré, Itapicuru, and Salgado rivers); São Francisco River basin; Rio de Janeiro, Brazil; Paraguay-Paraná River basin.

Length at first maturity / サイズ / 重さ / 年齢

Maturity: Lm 25.0, range 20 - 30 cm
Max length : 141 cm TL オス/雌雄の選別がない; (Ref. 39524)

簡単な記述 検索表 | 形態学 | 形態計測学

臀鰭: 195 - 300.

生物学     用語集 (例 epibenthic)

Occurs in swamps, creeks, and river with lentic waters. Preys on small invertebrates, particularly the larvae of aquatic insects (Ref. 12225). Breeds before the start of the rainy season (Ref. 10645) or during the rainy season, with a fecundity count of 6473 eggs (Ref. 10643). Males persistently defend their territory and apparently make electric signals (by increased electric organ discharge (EOD) rates and interruptions thereof) to females passing by to draw in a spawning partner (Ref. 10605). Mature females' EODs are of higher frequencies than mature males (Ref. 10645). Plasma androgens modulate the EOD frequency during the breeding season (Ref. 10767). Embryos hatch on day 4; larvae begin to feed on day 11. The electric organ and electroreceptors are both present in the larva at the time of first exogenous feeding (Ref. 10605). Seems to reach sexual maturity at 1 year of age, based on breeding experiments (Ref. 10011).

Life cycle and mating behavior Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生

Eggs of 3 mm diameter are deposited among plants. Larvae hatch after 4 days and start feeding after 11 days.

主な参考文献 Upload your references | 参考文献 | コーディネーター : Albert, James S. | 協力者

Ortega, H. and R.P. Vari, 1986. Annotated checklist of the freshwater fishes of Peru. Smithson. Contrib. Zool. (437):1-25. (Ref. 6329)

IUCNのレッドリストの状況は (Ref. 130435)


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