Eigenmannia virescens (Valenciennes, 1836)

Glass knifefish

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Gymnotiformes \| Sternopygidae
Synonyms	Sternachus virescens, Sternopygus lineatus, Sternopygus tumifrons, ... more
Common names	Anguila, Chucho, 青色埃氏电鳗, ... more

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Image of Eigenmannia virescens (Glass knifefish)

Picture by Galvis, G./Mojica, J.I./Camargo, M.

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Main reference

Albert, J.S. 2003. (Ref. 39524)
Other references | Biblio | Coordinator : Albert, James S. | Collaborators

Size / Weight / Age

Max length : 35.8 cm TL male/unsexed; (Ref. 79585); max. published weight: 59.0 g (Ref. 79585)

Environment

Benthopelagic; freshwater; pH range: 6.0 - 7.0; dH range: 2 - 15

Climate / Range

Subtropical; 20°C - 30°C (Ref. 12468)

South America: widely distributed east of the Andes from the Orinoco to the La Plata River basins.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Known to be gregarious, timid and nocturnal (Ref. 27188). Prefers deep still waters (Ref. 75964). Found in ponds (Ref. 11229) and creeks with a substrate rich in plant debris (Ref. 12225). This gymnotiform fish can be found in colder waters of 18°C (Ref. 10011). Electric organ discharge (EOD) frequency cues have been experimentally shown to play a role in species and sex recognition in this species (Ref. 10598). Playback of a conspecific male's electric courtship display elicited spawning in ripe females. Diel rhythmic change in EOD may be manifested by the increase in EOD amplitude at night among dominant breeding males as they compete with other conspecifics (Ref. 10599). A fractional spawner; fecundity reported at 905 eggs (Ref. 10605). Males reportedly reach 45 cm TL, females to 20 cm TL (Ref. 1672).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: of no interest; aquarium: commercial


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

Tools
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Summary page \| Point data \| Common names \| Photos

Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

Medium, minimum population doubling time 1.4 - 4.4 years (Fec=40-160 (per batch))


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low vulnerability (19 of 100)	Not marketed/unknown

Entered by Luna, Susan M.

Modified by Torres, Armi G.

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Page last modified by : elaxamana, 15 July 2009

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