The black-winged hatchetfish (Carnegiella marthae) is a freshwater ray-finned fish native to South America.

This species has wing-like pectoral fins that often extend to half of the fish's body length.

A stripe that is usually gold stretches horizontally from the gill cover the base of the tail.

Black-winged hatchetfish live in the calm streams and pools of the Orinoco and Negro region in South America.

Cover every hole at the top of the aquarium because in the wild, hatchetfish catch insects by jumping out of the water.