CAMPO GRANDE, Brazil — In the wide, sandy stretches of Brazil’s Araguaia River, the piraíba, South America’s largest catfish, is a cornerstone of local fisheries. Fishers often recognize individual fish by markings and scars, catching the same fish in the same places over time, leading many to believe the species did not move very far. … Continue reading 325 Long-neglected migratory freshwater fish species need protection now: Report