Home · Zenarchopteridae · Freshwater halfbeak
Freshwater halfbeak (Dermogenys pusilla) — Zenarchopteridae

Freshwater halfbeak

Dermogenys pusilla
DD · Data Deficient

The Freshwater halfbeak (Dermogenys pusilla) is a fish that lives in both fresh and salt water of the family Zenarchopteridae that grows up to 16 cm.

Length
16.1 cm
Water
Euryhaline
Depth
0.0–? m
Diet
Carnivore
Behaviour
Small groups
Body shape
Elongated (eel-like)
Substrate
Open water
Danger
Harmless
Edibility
Not eaten

Description

The wrestling halfbeak is a small, livebearing halfbeak (Zenarchopteridae) from Southeast Asia. The species grows to about 7 cm and has a slender body with a strongly elongated lower jaw; the upper jaw remains short. The name refers to the males, which can 'wrestle' with their jaws over territory. It lives just below the surface of rivers, canals, ditches, ponds and lakes and rarely enters the sea. It hunts insects fallen on the surface and mosquito larvae, making it useful for mosquito control. It is popular in the aquarium hobby and is harmless to humans.

Frequently asked questions

How do you recognise the Freshwater halfbeak?

The Freshwater halfbeak has an elongate, eel-like body, is mainly silver-grey and shows a plain pattern.

Where does the Freshwater halfbeak live?

The Freshwater halfbeak lives in both fresh and salt water and is mostly found around open water.

How big does the Freshwater halfbeak get?

The Freshwater halfbeak grows to a maximum of about 16 cm.

Is the Freshwater halfbeak dangerous to humans?

No, the Freshwater halfbeak is harmless to humans.

Is the Freshwater halfbeak edible?

The Freshwater halfbeak is not usually eaten.

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All data

Identification

Dutch name
Worstelhalfsnavel sourced
English name
Freshwater halfbeak verified
Scientific name
Dermogenys pusilla
Family
Zenarchopteridae
Other names
Half beak; Halfbeak; Malayan verified

Appearance

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

Habitat & distribution

Water type
Euryhaline sourced
Substrate
Open water sourced
Min depth (m)
0.0 verified
Origin
Native sourced

Behaviour & biology

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

For anglers

Edibility
Not eaten sourced
Fishing method
Sportvissen met kunstaas of (dood/levend) aasvis door te trollen, te werpen of drijvend te vissen in open water. 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 Dermogenys

More from the family Zenarchopteridae

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