Productive areas are found where structure creates ambush points and concentrates forage. Key spots include the confluences with the river's six tributaries, where changing currents and nutrient mixing attract fish. Areas with extensive submerged timber, known as "galhadas," are always worth targeting. The deeper pools found in bends of the river and along undercut banks provide refuge for larger fish. The mouth of the distributary can create unique current seams and eddies that hold predators.