The marbled hatchetfish (Carnegiella strigata) is a small, 3.5 cm (1.4 in) in length, freshwater ray-finned fish.

The small deep-bodied fish, in the genera Carnegiella, is from the family Gasteropelecidae which includes both Gasteropelecus and Thoracocharax.

Hatchet shaped, with a laterally compressed body, it presents a gold line extending from its eye to its caudal fin while the area below has a brown and cream colored marble-like pattern (hence its name).

Marbled hatchetfish are adapted to life in the Amazonian rivers as they resemble a dead leaf floating sideways on the surface of a body of water.

Their marble-like pattern is to give the illusion of rays of light breaking the waters surface and reflecting on the portrayed leaf.

In the Rio Negro region, the marbled hatchetfish lives in habitats called igapo and igrape.

In studies done in the past, the marbled hatchetfish can withstand different environments for short periods without too much stress induced.

This was mainly done from the high demand of ornamental fishes, and because they are easy to care for, marbled hatchetfish are low maintenance.