Productive areas include deep pools at the base of riffles, which often hold dorado waiting for prey. Undercut banks, especially those with overhanging trees, are prime locations for pacú and catfish. The confluence areas where Arroyo Arévalo meets larger rivers often create nutrient-rich zones that attract baitfish and larger predators. Rocky points and current seams where faster water meets slower pools are also reliable spots to find actively feeding fish.