Productive areas include confluences with smaller tributaries, which often create current seams and nutrient-rich zones. Submerged and fallen trees, known as "galhadas," are prime ambush points for Peacock Bass. Deep holes along outside river bends consistently hold large catfish. Isolated lagoons, or "lagoas," that maintain water through the dry season are hotspots for concentrated fish populations. Rocky outcrops and rapids in the upper sections provide habitat for species adapted to faster, oxygenated water.