灰黑锯脂鲤，为辐鳍鱼纲脂鲤目脂鲤亚目脂鲤科的其中一个种。分布于南美洲亚马逊河流域，体长可达18公分，栖息在底中层水域，生活习性不明。

Serrasalmus is a genus of piranhas. They are collectively known as pirambebas; the "typical" piranhas like the Piraya Piranha are nowadays placed in Pygocentrus. Like all piranhas, Serrasalmus are native to South America.

These fish are predatory, have sharp teeth and generally have a rhomboid shape. In some, the shape is more ovoid, particularly in old specimens. Some Serrasalmus species can exceed 20 in or 510 mm (S. manueli and S. rhombeus, according to OPEFE), placing them among the largest Serrasalmidae.