The Royal Peacock bass is a freshwater fish native to the Amazon basin in South America. The royal peacock bass is the smallest peacock bass and grows to a maximum length of 55 centimeters. Also, most display three wide vertical stripes on their bodies and a spot on their tail fins that resembles the eyes on a peacock's tail feathers—a feature which resulted in their English and Spanish common names. In addition, all adult males have a pronounced hump on their foreheads. Other physical traits can vary greatly, depending on the species, individual and stage of development. These include, but are not limited to: dark rosettes instead of stripes, light speckles and impressive shades of bright green, orange, blue and gold. The stripes, however, tend to fade in late adulthood.