There are several fish with the common name Giant Hatchetfish: a large marine fish, Argyropelecus gigas,
also called the Greater Silver Hatchetfish; Triportheus species of freshwater fish; and this small, Tetra-sized
"Giant" Hatchetfish, native to waterways of the Amazon Basin. It grows only to some 7cm long.
The hatchet shape with oversized keel has powerful chest muscles which allow the fish to leap well out of the water
and glide for nearly 3 metres (9 feet) to escape predators. Head on, it is very narrow. It feeds on small insects that fall to the water surface.