I'm not a big fan of the tree hugger crowd and I'm all in favor of responsible use of nature. I just see a big difference between raising animals from birth for a purpose and catching fully grown animals out of their natural habitat and sticking them in a small cage for people to gawk at. If they want to raise stingrays from birth in captivity, I have no problem with it. Then it's just like keeping fish in an aquarium as far as I'm concerned.
I'm probably going to regret this...
I remember reading a study in the Scientific American a few years back where it was established that the length of a goldfish's memory is something on the order of twelve seconds. It doesn't make any difference to the stingray if it was raised in captivity or captured fully grown; it doesn't remember. Visualizing the plight of the stingray is just anthropomorphization. What about those poor lobsters and dungeness crabs in tanks in fish markets just waiting for someone to buy them, take them home, and throw them live into boiling water? Yum. Pass the shell cracker, please. ;^)