Fully understand. Actually,arapaima is too big for aquarium hobby, when adult. Here in Brazil, there are some arapaima breeders. Not as ornamental ,but as food. So, less pressure over wild population.
About rays, good news anyway. If there are so many breeders, that means they're not that impossible to breed.Here in my country, there are no comercial breeders, as far as I know( and I've done a good research). All the stingrays legally market here are wild caught. By the way , a good amount of the collected rays goes for exportation , as I've been told by collectors. That's why I was thinking about exportation.
I'll take my chance on rays, as they reach a good price here. My intention is to keep wild genes , not making hybrids and not mixing different populations.
If nothing, it will be a nice fish to work with.
Thank's for all the attention !