Ocellate river stingray

Potamotrygon motoro can grow up to 50 cm (1.6 ft) in disc width, 1 m (3.3 ft) in total length,^[10] and 35 kg (77 lb) in weight.^[11] Its disk is roughly circular in shape, and its eyes are raised from the dorsal surface. The dorsal coloration is typically beige or brown, with numerous yellow-orange spots with dark rings. Its exact color, and the arrangement and size of the spots can vary significantly, both from individual to individual and depending on location. Three primary types have been identified in the Amazon basin, but each of these include a number of subtypes (two additional main types now are considered a separate species, P. marquesi).^[4][6] The two main Amazonian types, informally known as CD1 and CD2, are found throughout much of the Amazon (except most of the Rio Negro basin) and they often occur together.^[4] Those from the Río de la Plata Basin and Mearim River resemble CD1.^[4] Individuals from the Rio Negro and Orinoco basins (which are connected by the Casiquiare canal) are similar to each other and informally known as CD3, but differ from P. motoro elsewhere.^[4][5] Some individuals of CD3 have spots near the rim of the disc that are connected, forming a chain-like pattern.^[5] However, the "marbled" type is generally only reported from the Orinoco basin, including the Ventuari River.^[12]

In aquaria

Ocellate river stingrays are sometimes kept in captivity, with requirements similar to other members of Potamotrygon.^[3] It is one of the most popular species of freshwater stingrays, but requires a very large tank.^[13]

References