Fin's Fish Guide
The Glass Knife Fish (Eigenmannia virescens) is a freshwater fish of the family Sternopygidae that grows up to 44 cm.
Widespread in tropical South America, in pools and creeks with abundant plant debris and in deep, calm waters.
Description
The glass knifefish is a weakly electric knifefish (family Sternopygidae) of tropical South America. The species grows to about 44 cm and has an elongate, laterally compressed, translucent body without a dorsal fin but with a very long anal fin with which it swims smoothly forwards and backwards. It generates a weak electric field to orient itself in the dark and to communicate. The species is shy, nocturnal and lives in groups in deep, still waters, ponds and creeks rich in plant debris. Its diet consists of small invertebrates and insect larvae. It is harmless to humans.
Frequently asked questions
How do you recognise the Glass Knife Fish?
The Glass Knife Fish has an elongate, eel-like body, is mainly silver-grey and shows a plain pattern. Weakly electric knifefish with a translucent body and a long anal fin; orients itself with an electric field.
Where does the Glass Knife Fish live?
The Glass Knife Fish lives in fresh water and is mostly found around mixed bottom. Widespread in tropical South America, in pools and creeks with abundant plant debris and in deep, calm waters.
How big does the Glass Knife Fish get?
The Glass Knife Fish grows to a maximum of about 44 cm.
Is the Glass Knife Fish dangerous to humans?
No, the Glass Knife Fish is harmless to humans. None required: this species is harmless to humans.
Is the Glass Knife Fish edible?
The Glass Knife Fish is not usually eaten.
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Same genus Eigenmannia
More from the family Sternopygidae
Want the complete picture on the Glass Knife Fish?
Point your camera at the fish and Fin names the species in seconds. Free, and the Glass Knife Fish is one of 12,519 species in the app.