Fishing in Mato Grosso

Mato Grosso is a vast inland state in central-western Brazil, roughly twice the size of Germany, where three of South America's great biomes converge: the Amazon rainforest in the north, the Cerrado savanna across the center, and the Pantanal wetlands in the south.

That geography means the fishing isn't one thing — it shifts depending on which river system you're on and which season you're in. The southern Pantanal portion of the state draws a lot of attention.

The Rio Cuiabá and Rio São Lourenço are the main arteries here, both known for tucunaré (peacock bass) in clear, vegetation-lined water. These rivers wind through backwaters and deep pools that give the fish plenty of structure to hold in.

Larger catfish — jaú running 40 to 80 pounds, pintado and cachara in the 10 to 16 pound range — share the system, along with pacu, a thick-bodied omnivore that fights hard for its size.

The city of Cáceres, on the Rio Paraguai, sits at the edge of this region and has long been a hub for fishing activity. To the north, the Rio Manso tailwaters are the main destination for golden dorado.

The state of Mato Grosso has protected the species since 2012, and the population has responded — fish in the 6 to 20 pound range are present in these public waters.

May and September are considered the best months for fly fishing, when water clarity and levels align. The lodge-based trips here run out of Cuiabá, a couple of hours away by road.

Further north, toward the Amazon fringe, the Rio Juruena and the Serra do Cachimbo region hold trairão — a prehistoric-looking predator that earned the area a "Jurassic Park" nickname among Brazilian anglers — along with peacock bass, payara (vampire fish), and other Amazonian species.

Access to these northern waters is more remote and typically requires more planning. Regulation has been a live issue here.

A state law known as Cota Zero, in effect since January 2024, bans commercial fishing and fish transport across all of Mato Grosso for five years.

Sport fishing and catch-and-release continue, but the law has drawn significant criticism from WWF-Brazil and others who argue it targets artisanal fishers while leaving the actual drivers of stock decline — hydropower dams, deforestation, and unregulated fishing tourism — largely unaddressed.

Anyone planning a trip should check current rules with the relevant state authority before traveling, as the regulatory picture is still evolving. Mato Grosso rewards anglers who do their homework.

The rivers are real, the fish are real, and the distances between them are also very real.