The piranha is a carnivorous species while the pacu is omnivorous with vegetative tendencies.
The difference is evident in the structure of their teeth.
While they are not aggressive carnivores like the piranha, their crushing jaw system can be hazardous.
One toddler needed surgery after a pacu bit her finger at Edinburgh Butterfly and Insect World in Scotland.
When pet pacus outgrow their fish tank,many ownersend up dumping the fish in nearby lakes.
