Arroyo Garupá is a tributary stream flowing through the northeastern Argentine province of Misiones, ultimately joining the larger river system near the city of Posadas. This stream drains a region of remarkable biological richness, and its fish assemblage reflects the extraordinary diversity characteristic of the upper Paraná basin. With 57 documented fish species spanning five orders, 16 families, and 41 genera, Arroyo Garupá offers anglers a genuinely diverse fishery in a subtropical setting. The stream transitions from its headwaters through a middle reach and down to its mouth — each section supporting a distinct community of fish — making it a fascinating destination for those willing to explore its varied habitats.