Piranha is a general name used to describe a group of freshwater fish with a fearsome reputation when it comes to feeding.

and they found scales, hard spines that supported fish fins, and other remains of a cartilaginous fish—a fish with a spinal column of cartilage instead of bone, like modern sharks. The remains ...

At first glance, the fish looked like another known species ... The new species was identified by its body shape, scales, fin shape, coloring and other subtle physical features, the study said.

However, they have also been seen chasing prey and scavenging. They pick at the fins and scales of fish (using their specially adapted teeth) or eat the whole fish. While they are scanning for ...