There are more saltwater fish and plants aquarium to see at HK fish street but they don't carry high end stingray, and the space is very limited. Instead I am more interest to visit aquarium store at Singapore.
The main fish district in Hong Kong is called Tung Choi Street. I've seen top grade full size XB's put in 33 gallon tanks for daily display. Asking prices in the thousands of $. Presumably the fish get put in and out of the small tanks each day, maybe on a rotating basis?
Nearby Tung Choi street there are also some great bicycle stores (Flying Ball Bicylcle Company is a standout). You can save 40-50% retail on high end titanium framed bikes over prices in Canada...
There is a fish district in Kuala Lumpur, Malaysia that also does the "bagged aro" thing, Pasut Purdu. I've only seen lower grade rtg's and greens done that way (which makes sense I guess).