Hatchet Fish, also known as freshwater hatchetfish, originate from the slow-moving rivers and flooded forests of South America, particularly the Amazon and Orinoco basins. These fish are notable for their unique, deep, laterally compressed bodies that resemble the blade of a hatchet, highlighted by a deep, keel-like breast and a flat back. Typically measuring between 1 to 3 inches, hatchetfish have upturned mouths suited for surface feeding. Known for their temperament, they are peaceful, shoaling fish that prefer to be in groups of six or more and are surface dwellers famous for their powerful jumping ability, which means a tightly fitted aquarium lid is essential. Their suitability extends to community tanks with small, non-aggressive species, and they thrive in soft, slightly acidic, warm water with dim lighting and gentle flow. Popular nicknames found in search data include "silver hatchetfish" and "marbled hatchetfish," reflecting some common varieties. Hatchet fish are admired for their ease of care and distinctive appearance within the UK aquarium trade.