Serrasalmus elongatus is a slender and elongated shaped piranha from the S. humeralis group.

In its native range it is one of the smaller piranha species locally termed caribe pinche ("mediocre piranha"), like the iridescent piranha (S. irritans).

This term gave rise to various trade names, like "Pingke piranha" and "Serrasalmus pinke" which is not a proper scientific name[verification needed].

Adult S. elongatus are found in deep, white water and juveniles are in usually shallow black waters of lagoons.

Serrasalmus elongatus are notorious fin biters and should be kept in their own tank.