Black Ghost Knifefish Apteronotus albifrons

The Black Ghost Knifefish is native to fast-moving freshwater of the northern half of South America. Like other Ghost Knifefish in Central/South America, they are nocturnal and slightly electric, using their electric field to locate invertebrate prey and to communicate with their kind.

They are black with a white patch on the snout (from small to a long streak along the back) and two white bars on the tail end. They grow to half a meter long.

Like other knifefish, they move silently by undulating the ribbonlike elongated anal fin. The knife name is after the shape of the fish and its ribbonlike "blade".