Spotted Hatchetfish Care Guide
Gasteropelecus maculatus · Freshwater Fish
What Spotted Hatchetfish look like
The Spotted Hatchetfish (Gasteropelecus maculatus) exhibits a distinctive laterally compressed body that reaches a maximum adult size of approximately 2-3 inches (5-7.5 cm). Characterized by an extreme deep-keel chest, its body shape resembles a hatchet, which is a unique adaptation for its gliding behavior. The overall coloration is a reflective silver, adorned with dark spots scattered across the flanks, providing effective camouflage against predators in its natural habitat. The pectoral fins are notably large and wing-like, facilitating its ability to glide just above the water surface. Sexual dimorphism is subtle, with males typically exhibiting slightly more pronounced coloration and larger fins compared to females. Defensive adaptations include its ability to leap out of the water to evade threats, and the presence of a lateral line system that aids in detecting movement in the water column.
Behavior & temperament
Gasteropelecus maculatus is primarily a pelagic species, often found in schools within the upper layers of freshwater bodies in South America. It exhibits a social hierarchy typical of obligate schoolers, where individuals feel more secure and display less stress when in groups. The Spotted Hatchetfish is known for its peaceful temperament, making it an ideal candidate for community tanks. Breeding behavior is characterized by egg scattering, where females release eggs into the water column, allowing fertilization to occur externally. This species is generally non-aggressive but may exhibit territorial behaviors during breeding periods.
Diet & feeding
In the wild, the Spotted Hatchetfish is a carnivore, primarily feeding on small invertebrates and zooplankton. In captivity, it requires a diet rich in high-quality flake food, supplemented with live or frozen foods such as brine shrimp and daphnia to ensure optimal health and coloration.
Behind the name
The genus name Gasteropelecus is derived from the Greek words 'gaster' (belly) and 'pelecus' (axe), referring to the fish's hatchet-like shape. The species name 'maculatus' translates to 'spotted' in Latin, indicative of its distinctive spotted pattern.
Plan your tank
Check the numbers before you buy: tank volume, a stocking plan, cycle progress, water changes, and your ongoing care routine.
Keeping Spotted Hatchetfish?
AquaLens identifies your fish and plants from a photo, tracks water chemistry, and flags health issues early — free on iOS and Android.
