Metynnis hypsauchen is a species of serrasalmid found in Amazon and Paraguay river basins, as well as rivers of the Guiana Shield. It is one of the fish known as the "silver dollar" in the aquarium trade. It has frequently been confused with the very similar M. argenteus. It reaches a length of . References Serrasalmidae Fish of South America Fish of Bolivia Fish of Brazil Fish of Peru Taxa named by Johannes Peter Müller Taxa named by Franz Hermann Troschel Fish described in 1844