Common Hatchetfish (Gasteropelecus sternicla)

Size and appearance

The Common Hatchetfish is named for its unique body shape, which resembles a hatchet blade. These fish typically grow to a length of 4-5 centimeters (1.5-2 inches). Their laterally compressed bodies are silver in color, with a distinct black line running horizontally from the eye to the tail. The ventral side of their body is often darker, while their dorsal fin is relatively small compared to their large, wing-like pectoral fins. These fins are crucial for their ability to glide short distances above the water surface, a fascinating trait that sets them apart from other fish species.

Region

The Common Hatchetfish hails from the slow-moving rivers and streams of South America, particularly in the Amazon Basin. They thrive in densely vegetated waters where they can find ample cover and prey. In the wild, they are often found near the water’s surface, where they hunt for insects and other small organisms.

Behavior

One of the most captivating aspects of the Common Hatchetfish is its unique ability to jump out of the water, gliding for short distances using its pectoral fins. This behavior is not just for show; it’s a natural survival mechanism used to escape predators. In the aquarium, they are generally peaceful and get along well with other non-aggressive species. However, they are also known to be skittish and can be easily startled, so providing a calm and stable environment is essential.

Diet

Common Hatchetfish are primarily insectivores, feeding on small insects and larvae in the wild. In captivity, they can be fed a varied diet that includes high-quality flake foods, small pellets, and live or frozen foods such as brine shrimp and daphnia. It’s crucial to offer food that floats on the water’s surface, as they rarely venture to the tank’s bottom for feeding.

How to keep the Common Hatchet at home

Tank size: Due to their active nature and need for swimming space, a tank of at least 70 liters (20 gallons) is recommended. A longer tank is preferable to provide ample surface area.
Water conditions: The ideal water temperature for Common Hatchetfish is between 24-28°C (75-82°F). They prefer slightly acidic to neutral water with a pH of 5.5-7.5. The water hardness should be soft to moderately hard, ideally between 2-12 dGH.
Tank setup: To mimic their natural habitat, provide plenty of floating plants and dim lighting. This setup not only helps them feel secure but also reduces the chances of them injuring themselves if they attempt to jump. A secure tank lid is crucial, as these fish are known for their jumping abilities.
Tank mates: Common Hatchetfish are peaceful and do well in a community tank with other non-aggressive species. Ideal tank mates include tetras, dwarf cichlids, and small catfish. Avoid housing them with larger, predatory fish that might see them as prey.
Diet in captivity: As mentioned, they should be fed a diet that includes floating foods. Overfeeding should be avoided, as uneaten food can quickly pollute the water, which is detrimental to their health. Reproduction: Breeding Common Hatchetfish in captivity can be challenging due to their specific water requirements and delicate nature. They are egg scatterers, and the eggs typically hatch within 24-36 hours. Raising the fry can be tricky, as they require very small live foods like infusoria in the early stages. addition to your aquarium.

The Common Hatchetfish is a unique and captivating species that adds a touch of the exotic to any freshwater aquarium. With their distinctive appearance and fascinating behaviors, they are a joy to observe. By providing the right conditions and care, you can enjoy the presence of these beautiful fish in your home aquarium. Remember, a well-maintained tank with the appropriate setup and diet is key to keeping your Common Hatchetfish healthy and happy. Whether you’re a beginner or an experienced aquarist, these fish offer a delightful and enriching experience.

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