Silver Hatchetfish – Gasteropelecus spp.

Silver Hatchetfish, belonging to the genus Gasteropelecus (commonly Gasteropelecus sternicla or Gasteropelecus levis), is a fascinating freshwater species known for its distinct hatchet-shaped body and surface-dwelling behavior. Native to South American river systems, these fish inhabit calm waters rich in floating vegetation.

Their sleek, reflective silver bodies help them blend into their environment, while their unique body shape allows them to dart quickly and even glide above the water surface to escape predators. This makes them one of the most interesting behavioral species in the aquarium hobby.

Silver Hatchetfish are best kept in groups, where they exhibit coordinated surface activity. Their presence adds a dynamic top-layer dimension to aquariums, especially in planted and natural-style setups.

Key Features

• Known as Silver Hatchetfish (Gasteropelecus spp.)

• Unique hatchet-shaped body

• Reflective silver coloration

• Surface-dwelling species

• Capable of jumping/gliding

• Ideal for planted community aquariums

Size

• Adult size: 5 – 6.5 cm

• Slim body with deep chest profile

• Designed for surface movement

Temperament

Silver Hatchetfish are peaceful but active.

• Best kept in groups of 6–10 or more

• Occupy top water level

• Non-aggressive and community friendly

• Can be skittish if kept alone

Water Conditions

Stable water is essential for their health.

• Temperature: 24 – 28°C (75 – 82°F)

• pH: 5.5 – 7.5

• GH: 2 – 12 dGH

• Ammonia/Nitrite: 0 ppm

• Nitrate: < 20 ppm

Perform 20–30% weekly water changes.

Tank Setup

Silver Hatchetfish thrive in calm, planted aquariums.

Recommended setup includes:

• Floating plants (very important)

• Open surface area

• Dense plants below

• Gentle water flow

• Tightly covered lid (essential to prevent jumping)

Minimum tank size: 80 liters (~20 gallons).

Feeding Habits

Silver Hatchetfish are surface feeders.

Diet can include:

• Floating flakes or pellets

• Live foods (fruit flies, small insects)

• Frozen foods (brine shrimp, daphnia)

Feed 1–2 times daily, ensuring food stays at the surface.

Tank Mates

Ideal for peaceful community aquariums.

Suitable tank mates:

• Tetras

• Rasboras

• Corydoras

• Dwarf cichlids

Tank mates to avoid:

• Aggressive fish

• Bottom-heavy tanks with no top swimmers

• Large predators

Care and Maintenance

To keep Silver Hatchetfish healthy:

• Always use a tight lid (they jump easily)

• Keep in groups for security

• Provide floating plants

• Maintain stable water conditions

• Feed surface-appropriate foods

With proper care, they can live 4–6 years.

Why Choose Silver Hatchetfish?

• Unique hatchet-shaped body

• Fascinating surface behavior

• Peaceful and community friendly

• Adds activity to the top level of the tank

• Perfect for planted aquariums

Silver Hatchetfish is a truly unique species that adds movement, personality, and surface-level activity to aquariums. Its ability to glide and its sleek silver appearance make it a standout addition to any well-balanced community tank. 🐟✨🌿