The Marbled hatchetfish, (Carnegiella strigata), is a small, normally 3.5 cm (1.4 in) in length, freshwater ray-finned fish native to South America. Hatchet shaped, 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. This camouflage protects them against potential predators that may be lurking in the water. Their marble-like pattern is to give the illusion of rays of light breaking the waters surface and reflecting on the portrayed leaf. The fish itself does not move much, letting the waves and currents move it mostly, but with occasional brief twitching movements. This replicates the way a leaf would be blown around or carried away by the tide or a current. The line running from its eye, to its tail, is believed to replicate the midrib (midvein) of a leaf.