Fin's Fish Guide
The Siamese halfbeak (Dermogenys siamensis) is a freshwater fish of the family Zenarchopteridae that grows up to 4 cm.
Description
The Siamese halfbeak is a small, livebearing halfbeak from fresh and slightly brackish water of Southeast Asia. The species reaches only about 4 cm and has a very slender, elongate body with a short, needle-like extended lower jaw. As a surface swimmer it lives just below the water surface of quiet streams, ditches and rice fields and snatches insects that fall onto the water. Unlike many halfbeaks the female gives birth to live young. The fish appears in the aquarium hobby. The IUCN assesses the species as Least Concern (LC).
Frequently asked questions
How do you recognise the Siamese halfbeak?
The Siamese halfbeak has an elongate, eel-like body, is mainly silver-grey and shows a plain pattern. Short needle-shaped lower jaw; ovoviviparous small surface halfbeak
Where does the Siamese halfbeak live?
The Siamese halfbeak lives in fresh water and is mostly found around open water. Southeast Asia
How big does the Siamese halfbeak get?
The Siamese halfbeak grows to a maximum of about 4 cm.
Is the Siamese halfbeak dangerous to humans?
No, the Siamese halfbeak is harmless to humans. This species is harmless to humans. No specific first aid is needed. Still handle the fish with care: mind the fin rays and the sharp edges of the gill cover, and rinse any scratch with clean water and cover it. For a dirty or deep wound check tetanus status.
Is the Siamese halfbeak edible?
The Siamese halfbeak is not usually eaten.
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All data
Identification
Appearance
Habitat & distribution
Behaviour & biology
For anglers
Safety
Status & sources
Same genus Dermogenys
More from the family Zenarchopteridae
Want the complete picture on the Siamese halfbeak?
Point your camera at the fish and Fin names the species in seconds. Free, and the Siamese halfbeak is one of 12,519 species in the app.