Potamotrygonidae

Rosa’s round ray

Heliotrygon rosai

Cream vermiculations cover a light brown disc

• Tropical
• Lower river
• Upper river
• Southern Hemisphere
• Regional distribution
• Freshwater fish
• South America
• Other
• Large
• Tropical fish

Heliotrygon rosai, or Rosa's round ray, is a species of freshwater fish in the family Potamotrygonidae. It is native to the Amazon basin (Marajó to Peru) in South America. Its maximum disc width is 80 cm (2.6 ft) and the stinger is greatly reduced, rendering it virtually harmless.