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Sternopygus macrurus (Bloch & Schneider, 1801)

Longtail knifefish
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Native range | All suitable habitat
This map was computer-generated and has not yet been reviewed.
Sternopygus macrurus   AquaMaps   Data sources: GBIF OBIS
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Image of Sternopygus macrurus (Longtail knifefish)
Sternopygus macrurus
Picture by Galtier Delbosc, M.

Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (Straalvinnigen) > Gymnotiformes (Knifefishes) > Sternopygidae (Glass knifefishes)
Etymology: Sternopygus: Greek, sternon = sternon, + Greek, pyge = tail (Ref. 45335).

Environment: milieu / climate zone / depth range / distribution range Ecologie

; zoetwater benthopelagisch; pH range: 6.0 - 6.5; dH range: 4 - 15.   Tropical; 22°C - 28°C (Ref. 2059)

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | 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 / Size / Gewicht / Leeftijd

Maturity: Lm ?, range 20 - 30 cm
Max length : 141 cm TL mannelijk/geslacht niet bekend; (Ref. 39524)

Korte beschrijving Morfologie | Morfometrie

Anale zachte stralen: 195 - 300

Biologie     Verklarende woordenlijst (b.v. 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 Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

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

Voornaamste referentie Upload your references | Referenties | Coördinator : Albert, James S. | Medewerkers

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

Status op de Rode Lijst van het IUCN (Ref. 119314)


CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless





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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5020   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00309 (0.00197 - 0.00484), b=2.81 (2.67 - 2.95), in cm Total Length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).
Trophic Level (Ref. 69278):  3.2   ±0.40 se; Based on food items.
Weerstandsvermogen (Ref. 69278):  .
Kwetsbaarheid (Ref. 59153):  High vulnerability (63 of 100) .
Prijsklasse (Ref. 80766):   Unknown.