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Glass Knife Fish (Eigenmannia virescens) — Sternopygidae

Glass Knife Fish

Eigenmannia virescens
Family: Sternopygidae

The Glass Knife Fish (Eigenmannia virescens) is a freshwater fish of the family Sternopygidae that grows up to 44 cm.

Length
44 cm
Water
Freshwater
Diet
Carnivore
Behaviour
Small groups
Activity
Nocturnal
Body shape
Elongated (eel-like)
Substrate
Mixed bottom
Danger
Harmless
Edibility
Not eaten

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.

Where does the Glass Knife Fish live?

The Glass Knife Fish lives in fresh water and is mostly found around mixed bottom.

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.

Is the Glass Knife Fish edible?

The Glass Knife Fish is not usually eaten.

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All data

Identification

Dutch name
Glasmesvis sourced
English name
Glass Knife Fish verified
Scientific name
Eigenmannia virescens
Family
Sternopygidae
Other names
Glass knifefish; Green knifefish verified

Appearance

Size class
Large verified
Max length (cm)
44.0 verified
Body shape
Elongated (eel-like) sourced
Dominant colour
Silver / grey inferred
Pattern
Plain inferred
Tail shape
Rounded inferred
Mouth position
Terminal inferred
Lips
Thin inferred
Barbels
No sourced
Dorsal fins
One continuous inferred
Dorsal spines
No sourced

Habitat & distribution

Water type
Freshwater sourced
Substrate
Mixed bottom sourced
Origin
Native sourced

Behaviour & biology

Diet
Carnivore sourced
Social behaviour
Small groups inferred
Territorial
No inferred
Activity
Nocturnal inferred
Reproduction
Separate sexes sourced
Sexual dimorphism
No inferred

For anglers

Edibility
Not eaten sourced
Fishing method
Bodemvissen met natuurlijk aas (worm, garnaal of vis) op of vlak boven de bodem. inferred
Regulations source
FishBase ↗ inferred

Safety

Danger to humans
Harmless sourced

Status & sources

Sources
FishBase via GBIF (DwC-A), CC-BY-NC 4.0

Same genus Eigenmannia

More from the family Sternopygidae

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