Marbled Hatchetfish

Gasteropelecidae sp.

Marbled Hatchetfish (Gasteropelecidae sp.) — Varies care, Peaceful, under Other. Minimum tank in the app: 32 US gal min; aim for 68–82°F and pH 6.5–7.5. The Marbled Hatchetfish is ideal for aquarists who appreciate unique surface-dwelling species with character.

Marbled Hatchetfish (Gasteropelecidae sp.) in a planted freshwater aquarium
Care levelVaries
TemperamentPeaceful
Min tank size32 US gal min
pH range6.5–7.5
Temperature68–82°F
Max size1.6 in (4.0 cm)
Captive lifespan3–6 years
SchoolingNo

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.

Marbled Hatchetfish Tank Setup

A tank for these fish should prioritize a spacious swimming area complemented by floating plants or surface cover to mimic their natural habitat. Moderate water flow can enhance their swimming behavior, and a substrate of fine gravel or sand with minimal decor allows for open swimming space. Lighting should be moderate to highlight their shimmering bodies without causing discomfort.

What Do Marbled Hatchetfishs Eat?

These fish are omnivorous with a moderate feeding speed; they can struggle against faster competitors during feeding times. A varied diet is essential to maintain their health and vibrant coloration, with special attention given to high-quality flakes and occasional live or frozen foods to stimulate their natural foraging behavior.

Marbled Hatchetfish Tank Mates

Ideal tank mates include small to medium-sized fish that occupy different vertical zones, avoiding overly aggressive species that might intimidate them. Combinations with fin-nipping species should be approached with caution, as the Marbled Hatchetfish may react defensively. Intraspecies, they can coexist peacefully given enough space, but overcrowding can lead to stress and hierarchical disputes.

Are Marbled Hatchetfishs Good for Beginners?

Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate their need for surface cover and spacious swimming areas, leading to stress and a decline in health. failing to maintain stable water parameters can trigger behavioral issues, such as hiding or aggressive interactions.

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