Bagre-africano

Habitat Distribution

• Introduced from Africa for aquaculture in 1986; now established as an invasive species across most Brazilian watersheds after mass escapes during floods in the upper Paraná basin in 1996–1997.
• Most concentrated in urban rivers and reservoirs — rivers like the Meia Ponte (GO), Tietê (SP), and the Guaraguaçu basin (PR) are documented sites.
• Colonizes irrigation canals, ponds, and slow-water reservoirs, particularly where soft, muddy bottoms and low oxygen levels exclude less tolerant species.
• Can breathe atmospheric air for short periods, allowing it to survive in heavily polluted or oxygen-depleted water where most fish cannot.

Key Locations

• Rio Meia Ponte, Goiás — one of the most cited urban rivers where the species is well established and regularly targeted by local anglers.
• Rio Tietê, São Paulo — present through much of its urban stretch; accessible to a large population of city-based anglers.
• Guaraguaçu River basin, Paraná — a documented introduction site and one of the earliest recorded wild populations in Brazil.
• Upper Paraná watershed reservoirs — the region where mass escapes occurred in 1996–1997, seeding populations across connected waterways.

Specific Spots

• Deep holes with soft, muddy substrate — typically 2–10 meters — where the fish rest during daylight hours.
• Undercut banks, submerged timber, and concrete infrastructure in urban rivers; the fish uses hard structure as daytime cover.
• Reservoir inflows and canal mouths at night, where current concentrates food and the fish move out to feed.
• Shallow, weedy margins after dark — this is a nocturnal feeder that leaves deep water once the sun drops.