Leporinus macrocephalus
Piauçu is a large, plant-eating characin native to the Paraguay River basin and the Pantanal wetlands of western Brazil. It grows to nearly 70 cm and over 5 kg, making it one of the bigger targets in Pantanal freshwater fishing.
Widely farmed across Brazil, it also draws anglers to natural waters in Mato Grosso and surrounding drainages where wild populations persist.
Scientific Name: Leporinus macrocephalus
Also known as Piauçu, Piavussu, Piavuçu, Megaleporinus macrocephalus
- Elongated, torpedo-shaped body with a small subterminal mouth angled slightly downward — built for grazing along the bottom rather than chasing prey.
- Silvery flanks marked with faint dark bars or blotches that can intensify or fade depending on mood and background; fins are clear to dusky.
- Eyes sit relatively high and forward on a notably large head — the trait behind the name macrocephalus ("large head").
- Reaches up to 68 cm and 5.3 kg; fish over 40 cm are considered solid catches in wild waters.
What to know
Habitat Distribution
- Native to the Paraguay River basin in the Pantanal biome of western Brazil — this is its home water, centered on Mato Grosso and Mato Grosso do Sul.
- A benthopelagic species that spends most of its time in the lower water column, close to the bottom of rivers, flooded plains, and connected lagoons.
- Also widely established in fish farms across the western Amazon and other Brazilian regions through aquaculture, where it is one of the more commercially important native species.
- Prefers tropical freshwater environments; not found in brackish or marine conditions.
Key Locations
- Paraguay River basin, Mato Grosso and Mato Grosso do Sul — the species' native range and the heart of wild-fish angling for piauçu.
- Rio Cuiabá near Barão de Melgaço, Mato Grosso — the type locality where the species was first described; still fished today.
- Pantanal floodplain lagoons and side channels — seasonally flooded areas that concentrate fish during high water.
- Fish farms across the western Amazon region, where piauçu is one of the primary cultured species and recreational fishing is sometimes available.
Specific Spots
- Shallow, vegetated margins and flooded grasslands in the Pantanal — dense aquatic plants provide both food and cover.
- Bottom structure near submerged roots, fallen timber, and sandy depressions where the fish graze and rest.
- Slower side channels and backwaters off main river current, especially during high-water periods when the Pantanal floods and fish spread into the floodplain.
Leporinus macrocephalus FAQ
Answers from onWater's species guide.
What are the best lures and bait for Leporinus macrocephalus?
Plant-based dough baits, bread, and ripe fruit pieces are the traditional and most effective baits, they match what piauçu actually eat and can be fished on a simple bottom rig.
When is the best time to fish for Leporinus macrocephalus?
Wet season (roughly November through March), rising water floods the Pantanal, fish spread across the floodplain, and feeding activity increases; generally the most productive period for wild piauçu.
How do you catch Leporinus macrocephalus?
Most anglers in Brazil fish piauçu from the bank or small boats using bottom rigs baited with dough, bread, or fruit, letting the bait sit on or just above the substrate in vegetated shallows and flooded margins.
What do Leporinus macrocephalus eat?
Primarily herbivorous, feeds on aquatic plants, submerged fruits, leaves, and algae scraped from hard surfaces. Its small, downward-angled mouth is shaped for this kind of bottom grazing. Bread, plant-based dough baits, and fruit pieces are the go-to natural baits for targeting piauçu in Brazil.
Where do Leporinus macrocephalus live?
Native to the Paraguay River basin in the Pantanal biome of western Brazil, this is its home water, centered on Mato Grosso and Mato Grosso do Sul. A benthopelagic species that spends most of its time in the lower water column, close to the bottom of rivers, flooded plains, and connected lagoons.
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