janfred- I'm not QOC but I can answer your question. The stingrays at Stingray City in Grand Cayman are free to come and go. You sail/boat out to a sandbar, the stingray have been "trained" over the years to come there expecting easy food. So they are always there and they are "wild" with respect that they are there of their own choosing, but they have been conditioned over the years to expect to be fed and not to be afraid of the humans. You walk around with them and hand feed them (water is waste deep). I agree that locking them up takes something away from the experience.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise, Magic 1/14, Freedom x 2 6/14
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013