Potamotrygon: Greek, potamos = river + Greek, trygon = a sting ray
A widespread species that may require subdivision. Rosa recognizes Potamotrygon dumerilli (Castelnau 1855) and Potamotrygon humerosus Garman 1913 as distinct species, but evidence given is meager.
Wild stingrays are predatory and prey on fishes, insects and crustaceans. Their captive diet must reflect this since dried food is unlikely to be accepted. They will eat dead food without any problem and so frozen lancefish, whitebait, sardines ect can all be used.
The sexes are easily told apart because this is a live bearing species and males have claspers which are male sexual organs on each side of their pelvic fins, females don't have these.
Breeding these fish is difficult, they are live bearers and don't have a breeding season. Females give birth to one to eight young which are known as pups. Captive breeding is down to keeping a pair in top condition and luck. Unusually for fish, the fry develop inside the female and instead of relying on a large yolk sac the fry actually take nourishment directly from their mother. The pups are born fully formed and fully independant.
Potamotrygon orbignyi is a widely distributed freshwater stingray found throughout numerous river systems of the Amazon Basin. It does exhibit geographical variation. The species is taken as food and juveniles are taken for the ornamental fish market. In some areas, its habitat is threatened by illegal mining activities. It is also persecuted in tourist areas and also targeted in sports fisheries. It is assessed as Least Concern due to its wide distribution and abundance by the ICUN Red list of Threatened Species.
pH: 6.8 - 7.5
dGH: 4 - 12
Temperature: 24 - 26°C (75 - 78°F)
Size:35cm (14in) (Diameter).
Min tank size: 675 litres
Difficulty level: Very difficult
Aquarium type: Species/Community
Swimming level: Bottom
Origin: South America: Widespread in Amazon and Orinoco River basins and in river systems in Suriname, Guyana and French Guiana.
Habitat: Rivers, stream swamps, floodplain lakes and lagoons.
Species: P. orbignyi (Castelnau, 1855)
Reticulated stingray, Teacup Stingray, Smoothback stingray
Synonyms: Potamotrygon reticulatus, Trygon reticulatus, Potamotrygon dumerilii, Trygon dumerilii, Trygon orbignyi