Coloration looks to be greenish-black above and white below. Males rarely grow to be longer than 20 feet in length (6 meters) and weigh around 2 tons. Female Piranhadon can be up to 50 feet long (15.2 meters), and weigh around 14 tons with a relatively narrow, eel-like tail, and a larger, muscular body. Though they are the largest river predator on Skull Island and apex predator of the swamps, when hunting prey near the riverbanks, they should be alert at all time from Vastatosaurus rex where they themselves might fall prey. They will remain there until heat, dryness, and the threat of suffocation forces them back in the water. Once ashore, birds, lizards, and other scavengers will flock to the huge fish, picking it clean of innumerable parasites. Piranhadon also use their lunging ability and powerful pectoral fins to occasionally beach themselves on a shaded river bank. A surge of its enormous body, and it will lunge out of the water, taking its prey in its jaws, either killing it with a massive bite or dragging it down below the surface to drown. An ambush predator, Piranhadon tends to lie in wait near the river banks, using its sensitive barbels to detect the approach of potential prey, as its eyes are poor and can only see differences between light and dark.

Already five feet long at birth, a juvenile Piranhadon is already a dangerous aquatic predator, and will devour water birds, fish, amphibians, small dinosaurs, and just about anything else it can catch, including larger terrestrial animals. Young are born live in groups of around a dozen.

Male Piranhadon are much smaller than the females and must compete to prove their worth as mates.

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