Productive areas include deep pools formed by logjams and undercut banks, which provide cover for large catfish and pacu. Confluences where Ribeirão Esmeril meets larger rivers are hotspots for predatory species like dourado that ambush baitfish. Areas with overhanging native fruit trees, such as genipap (Genipa americana) and tucum palm, are prime locations for pacu, especially when fruit is dropping into the water. Rocky outcrops and faster riffles attract foraging piranha and other species.