Amazon Fish Encyclopedia
The Speedy Schoolfish
Silver Dollar Fish
Amazon
Fish Species Guide
Species Fact Sheet
Pacu Information
The Pacu (Pah-Cuh) is a remarkable species often called the "vegetarian piranha" due to its appearance but vastly different diet. Despite their intimidating teeth, these powerful fish primarily feed on fruits and nuts that fall into the water. Their unique ability to crush hard seeds and nuts makes them important seed dispersers in the Amazon ecosystem.
Catch Distribution
The estimated potential yield for Pacu is approximately 7,300 tons, with the Central Amazon being the primary fishing region, accounting for 75% of the total. The Peruvian Amazon follows as the second most significant region, contributing 13% of the yield.
Natural History
The Pacu group in commercial fisheries includes species from the genera Mylossoma, Myleus, and Metynnis, with Mylossoma duriventre and Mylossoma aureus being the most commercially valuable. Pacu are omnivorous but have a strong preference for fruits and seeds. While Mylossoma species are commonly found in whitewater and clearwater rivers, they are generally absent from blackwater environments, where other Pacu genera are more prevalent. Mylossoma species are also migratory, forming large schools as they move through whitewater and clearwater river systems.
Habitat & Distribution
Distribution of Pacu catches. Source: Barthem, R., Goulding, M. 2007. An unexpected ecosystem: the Amazon as revealed by fisheries. Missouri Botanical Garden Press.
Pacu are found across a variety of freshwater environments in South America. They are migratory fish that follow changing water levels, moving into flooded areas during high water seasons and retreating to deeper channels when waters recede. They show a strong preference for areas with overhanging vegetation that provides their primary food source.
- • Rich in food sources
- • Warm, slow waters
- • Overhanging vegetation
- • Amazon basin
- • Orinoco system
- • Paraná watershed
- • Follows water levels
- • Seeks food-rich areas
- • Adapts to conditions
Behavior & Diet
Pacu are omnivores with a strong preference for plant matter. Their unique diet and feeding habits make them crucial seed dispersers, helping to reforest the banks of the Amazon through their digestive process.
- • Primary food source
- • From rubber trees
- • Palm tree fruits
- • Aquatic vegetation
- • Flowers and leaves
- • Various algae
- • Small fish
- • Crustaceans
- • Various insects
- • Forest regeneration
- • Seed dispersal
- • Ecosystem balance
Through their seed-dispersing behavior, Pacu contribute significantly to the regeneration of Amazon forests, spreading viable seeds along riverbanks.
Fishing Techniques & Best Practices
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Pacu are smart, fast, and incredibly strong, offering an exciting challenge for anglers. Their hard mouths and powerful jaws require strong tackle and sharp hooks, while their cautious nature demands patience and strategy.
Best Techniques
- Natural Baits: Fruits, nuts, corn, or dough balls
- Live/Cut Bait: Small fish or insects as backup
- Location: Near submerged trees and branches
Recommended Gear
- Rod: Heavy-action rod (30-50 lb test)
- Reel: Baitcasting or strong spinning reel
- Line: Braided or monofilament (40-60 lb test)
- Hooks: 2/0 to 5/0 circle or treble hooks
Pro Tips
- • Use strong leaders to prevent break-offs from powerful bites
- • Practice patience - Pacu can be cautious before committing to a bite
- • Chum with fruits and seeds to attract fish to your area
Conservation & Sustainability
Pacu populations have declined in some regions due to overfishing and habitat destruction. While they are commonly farmed in aquaculture operations, wild populations remain essential for the Amazon's ecosystem health. Their introduction outside their native range has led to invasive population concerns in some areas.
Sustainable Fishing Practices
Release large individuals to maintain populations
Avoid harvesting undersized fish
Choose sustainably farmed when possible
Monitor non-native populations
Cultural Significance & Fun Facts
Unique Dentition
Famous for their human-like teeth, which are specially adapted for crushing tough nuts and seeds.
Piranha Look-Alike
Often called "vegetarian piranhas" due to their similar body shape but vastly different diet.
Market Value
Highly valued in South American markets for their tasty meat, commonly prepared grilled or fried.
Adaptable Species
Can survive in low-oxygen environments and are closely related to Tambaqui, though usually smaller in size.
