The Black shark (Labeo chrysophekadion), also known as the Black shark minnow or Black labeo, is a massive cyprinid native to Southeast Asia. It is one of the largest species kept in the aquarium hobby, reaching 65–90 cm in length. Juveniles may look manageable, but adults require aquaria of several thousand liters. In captivity they are notorious for becoming extremely territorial and aggressive as they mature. Because of their size and behavior, they are suited only for very large public aquaria or the largest private installations.