Species profile
Black-winged Hatchetfish
Carnegiella marthae
Peaceful
Moderate care
60 L minimum aquarium
2.5–3.5 cm adult size
Top
Minimum group: 10
About this species
General notes for hobby use.
Very small surface shoaler and an exceptional jumper; close every opening in the cover.
Water parameters
Suggested general range for long-term care.
Temperature
23–27 °C
pH
5–7
GH
0–10 dGH
KH
Not yet documented
Flow preference
Low
Data confidence
Verified
Behaviour
General behaviour traits used by TanksConnected compatibility checks.
Minimum group size
Minimum group: 10
Tank zone
Top
Territory level
None
Predation risk
Tiny fry
Bioload factor
0.35
Shy and easily stressed by boisterous tankmates. A large shoal and shaded surface cover are strongly preferred.
Compatibility flags
Quick cautions for common tank-planning issues.
Fin nipper
No
Plant safe
Yes
Shrimp safe
Yes
Snail safe
Yes
Cave breeder
No
Digs substrate
No
Jump risk
Yes
Natural history & care
Research-backed context for long-term aquarium care.
Lifespan
Not yet documented
Diet type
Carnivore
Minimum aquarium volume
60 L
Minimum footprint
60 × 30 cm
Accepted scientific name
Carnegiella marthae
Alternative names
Black-winged Hatchetfish, Blackwing Hatchetfish
Native range
Orinoco and Rio Negro systems in northern South America.
Natural habitat
Soft acidic blackwater and forest-edge habitats. Use floating vegetation, subdued light, gentle flow and a sealed lid.
Diet & feeding
Small surface insects and invertebrates; offer tiny floating foods and live/frozen microfoods.
Breeding & sexing
Research-backed guidance for identifying sexes and reproductive behaviour.
Sexing
Females may be fuller-bodied when gravid; otherwise sexes are difficult to distinguish.
Breeding
Captive breeding is uncommon; likely scatters eggs around surface vegetation in very soft acidic water.