Species profile
Wrestling Halfbeak
Dermogenys pusilla
Peaceful
Moderate care
90 L minimum aquarium
5–7.5 cm adult size
Top
Minimum group: 6
About this species
General notes for hobby use.
The trade name 'Wrestling Halfbeak' is used loosely for several Dermogenys. These values apply to confirmed D. pusilla.
Water parameters
Suggested general range for long-term care.
Temperature
24–28 °C
pH
6.5–8
GH
10–20 dGH
KH
5–15 dKH
Flow preference
Low–moderate
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 6
Tank zone
Top
Territory level
Moderate
Predation risk
Fry
Bioload factor
0.8
Surface-dwelling livebearer. Males spar and display, so a group needs surface cover and enough horizontal space to avoid constant chasing.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
No / caution
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
3–5 years
Diet type
Omnivore
Minimum aquarium volume
90 L
Minimum footprint
75 × 30 cm
Accepted scientific name
Dermogenys pusilla
Alternative names
Wrestling Halfbeak, Malayan Halfbeak
Native range
Southeast Asia; confirmed D. pusilla is associated particularly with Java and nearby waters.
Natural habitat
Quiet to gently flowing lowland waters, canals and vegetated margins; spends most time immediately below the surface.
Diet & feeding
Surface-feeding insectivore/omnivore; offer small floating foods, fruit flies, mosquito larvae and frozen/live invertebrates.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Males are smaller and possess a modified anal fin/andropodium; females are larger and fuller-bodied.
Breeding
Livebearing species. Females give birth to relatively large free-swimming young after internal fertilisation.