Everybody loves freshwater stingrays, unfortunately most of the rays in the hobby are the South American Potamotrigon species. Surprisingly, there is a huge number of Asian fresh water species that don't get as much attention as they deserve. They rarely show up in US or in Europe in aquarium trade. It might be something to do with the facet that they are much more fragile, more difficult to feed (they have smaller mouth), and require much more space due to their very long tails.
Most of the Asian species belong to Himantura or Dysiatis genus. There is some discussion as to whether they are brackish or pure freshwater. I think that most of the Himanture sp are pure freshwater, but Dysiatis are a mixed bag.
The most famous Aisan whiptail ray is Himantura chaophraya or the gian freshwater ray. It is one of the biggest freshwater fish right now. There was one guy from Singapore a few years who had it in his pond, not sure what happened later. I don't know any other ones in captivity, but it would be super cool if one of the public aquarium got one.
Here is the new born giant ray. Yes they are born small
Himantura chaophraya in captivity somewhere
Another captive giant stingray, notice the broken tail
Himantura oxyrhynchus or the leopard stringray (notice very long tail)
Himantura krempfi - another leopard ray
Himantura signifer - white ribbon ray
Not a good idea to feed it goldfish, but someone tried
Himantura kittipongi- don't know much about this guy. i could not even find live pics of him
Makararaja chindwinensis -not much info on this guy either. I think he is from Maynamar
Some un-identified stingrays in a box