ABSTRACT Freshwater elasmobranchs, both euryhaline and obligate species, are poorly understood and highly threatened with extinction globally. Euryhaline species can move tens to thousands of kilometres, whereas obligate species studied so far typically moved < 10 km, supporting management at local scales. We report a female giant freshwater stingray, Potamotrygon brachyura , that moved approximately 170 km after being tagged and released in Argentina's lower Paraná River. This is by far the longest movement distance ever recorded for an obligate freshwater elasmobranch worldwide. This suggests large‐bodied freshwater obligates can move over broad spatial scales, requiring wider‐scale conservation and management strategies than previously thought.
Vazquez et al. (2026) studied this question.