Raising Pacu: A Big, Plant-Eating Warm-Water Food Fish
A guide to pacu - a large, hardy South American fish related to the piranha that grows to substantial size on a largely plant-based diet and yields meaty fillets in warm systems.
Pacu are big, deep-bodied South American fish, relatives of the piranha but largely plant-eaters equipped with blunt, crushing teeth for seeds and nuts. Hardy and fast-growing in warm water, they reach a substantial size and yield meaty fillets, but that size means they need a genuinely large system.
Is it right for you?
Pacu suit a grower with a large warm system who wants a big, meaty fish and can accommodate their eventual size. They are hardy but not a small-tank species.
System & Space
They need a large tank or lined pond - hundreds of gallons - because they grow big. Strong filtration handles their heavy feeding.
Water & Temperature
Tropical fish, they want warm water around 25-30C and tolerate a range of conditions. Keep the biological filter cycled.
Stocking & Feeding
Stock fingerlings and feed a mostly plant-based diet with pellets, vegetables and fruit; they relish produce. Their crushing teeth mean they are not fussy eaters.
Health & Care
Hardy in reasonable water; the main challenge is simply their size and the space and filtration it demands.
Harvest & Enjoying Them
They grow large in warm conditions, yielding firm, meaty flesh grilled or fried.
Getting Started
Plan for the size from day one, set up a large cycled system, and stock fingerlings from a reputable source.
Common Mistakes
The classic error is underestimating how big pacu get and starting them in a system that quickly becomes far too small.
FAQ
Are they like piranhas? Related, but pacu are mostly plant-eaters with crushing teeth.
How big? Large - they need a big system.