Pacu refers to several species of omnivorous freshwater fish native to South America, closely related to piranhas but differing in diet and behavior. Unlike their carnivorous relatives, pacus feed mostly on plant material such as fruits, nuts, and seeds. They are popular in home aquariums and are known for their calm temperament, though their strong jaws can be dangerous if mishandled.
Scientific Name
Family: Serrasalmidae Order: Characiformes
Habitat
Rivers, floodplains, lakes, and flooded forests in tropical and subtropical South America
Conservation
Not endangered; common in native habitats and aquaculture
Lifespan
15–25 years in captivity
Fun Fact
Pacus are nicknamed “vegetarian piranhas” due to their close relation to piranhas and their plant-based diet.
Diet
Omnivorous; mostly fruits, seeds, nuts, grains, and occasionally insects or snails
Average Size
Up to 90 cm (35 inches); some species can weigh up to 25 kg (55 lbs)
Location / Placement info
Displayed in the Coastal Reef Exhibit, near the Ocean-View Tunnel
FAQ
Is pacu the same as piranha?
No. While they are related, pacus are mostly herbivorous and not aggressive like piranhas.
Can pacus be kept in aquariums?
Yes, but they need large tanks due to their size and rapid growth.
Do pacus bite?
They are not aggressive, but their strong jaws can cause injury if provoked.
What do baby pacus eat?
Juvenile pacus eat insects, snails, and plant matter.
Are pacus safe with other fish?
Only if the tank mates are of similar size and temperament; avoid small or delicate species.
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