Blackwing Hatchetfish
Gasteropelecidae sp.
Blackwing Hatchetfish (Gasteropelecidae sp.) — Varies care, Peaceful, under Other. Minimum tank in the app: 30 US gal min; aim for 68–82°F and pH 6.5–7.5. The Blackwing Hatchetfish is ideal for aquarists looking to add dynamic mid-water swimmers to a well-planted tank.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South America
- South America
Regional colours match the stocking calculator’s origin map.
Blackwing Hatchetfish Tank Setup
Create a mid-level swim zone with ample cover using plants and driftwood to provide shelter and reduce stress. Opt for a gentle water flow to mimic natural conditions, and use a dark substrate to enhance their coloration. Lighting should be moderate; too bright can cause discomfort and hiding, while softer light allows for natural behaviours.
What Do Blackwing Hatchetfishs Eat?
As omnivores, they adapt to various food types but may be slower to compete during feeding. Ensure a well-balanced diet rich in both protein and plant materials to maintain health and vibrancy.
Blackwing Hatchetfish Tank Mates
Best kept with species of similar size and temperament to avoid aggression. Ideal companions include other small to mid-sized fish that occupy different tank zones, reducing the likelihood of conflict. Caution is needed with overly boisterous species which may stress the Blackwing Hatchetfish, and observe intraspecies interactions, as too many individuals can escalate territorial disputes.
Are Blackwing Hatchetfishs Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate the importance of tank structure, leading to stress and aggression. Overcrowding or mixing with overly aggressive tank mates can disrupt their behaviour.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




