bluedempsey said:fresh= south amer.
dasyatis= brackish to full marine
asia= ?

Well that answers the simple question.
I am referring to the physical characteristics such as "poison stingers", non-poisonous, etc..
Doesn't all of them have the same poisonous stingers? If you swim in the ocean and there is a ray in there, you "could" (keyword) get stung. Not many people I know go "swimming" in the lake, but mostly pools and ocean. Actually it is not even swimming, but mostly just wading. I guess I just can't fathom the reasoning of some of the governing powers that dictate what and what we cannot keep. Asian Aros, as long as they have a chip installed, then that should say that they are from a farm, and fish with no chips could not be sold...how simple is that?
We are just slaves of people that has no idea on what solutions can be applied. But instead, the easiest solution to these imbeciles are "blanket approach" to their so called problems. In example, the snakeheads. The eat all the fish in the pond, and they can walk in land, let's just banned the species because we have no idea how they look. Asian Aros, very endagered in the wild, but very prolific in farms. They are busting out at the seams, BUT, our governing powers could not accept the fact that these fish could be obtained by using the new technology. Why can't we have people that have some sense work in these departments!
FRUSTRATING!!!