Black Ghost Knifefish

The Black Ghost Knifefish is a distinctive, semi-aggressive, nocturnal fish native to South America's freshwater habitats. They are a popular aquarium choice and can live over a decade. Appearance: Shaped like a large knife blade, they are dark in color with a laterally compressed body that tapers to a blade-like shape ventrally. Behavior: They are predatory and can grow to over a foot long.