Replying to
@wild boar
The answer to your first question:
As
@Persephone noted, Shedd’s Oceanarium has 3 main pools: one for the Pacific White-Sided Dolphins, one for the Belugas, and the show / activity pool. My understanding is that there are a couple of smaller pools for quarantine and medical care as well though I have not actually seen those.
Regarding your other questions:
I was trying to avoid making direct criticisms so I paraphrased the names of the other institutions, but what the heck. SeaWorld has a long-running, successful Beluga program but the company as a whole has spent the last decade mired in numerous other controversies. If you aren’t aware of these, spend some time in the SeaWorld archives on ZooChat. Regardless of whether they have been right or wrong in these issues, public sentiment has increasingly turned against them and many organizations with intact reputations have reduced dealings with them as a result. Shedd may or may not fall into this category, but anything that relates to captive Cetaceans is HIGHLY scrutinized by a variety of government agencies and private organizations (you could include the ZooChat community in this list).
Regardless of controversies, facilities outside of the US (Marineland Canada) would be out of the question for transfers due to the regulatory ninja-warrior obstacle course that would be necessary to do so; and that was before Canada moved to ban most the keeping of most Cetaceans.
That leaves two other Beluga facilities in the US to choose from. The most well known is probably the Georgia Aquarium (Georgia is north of Florida and east of Alabama). While Georgia is an incredible facility with a very solid reputation, its Beluga program has arguably been a disaster. Multiple unusual animal deaths combined with their effectively failed attempt to start a breeding program have created a giant stain on an otherwise sterling reputation.
The final facility, as you mentioned, is the Mystic aquarium in Connecticut. While it is another AZA accredited facility with an intact reputation and an established, successful Beluga program, it is the only other one. I knew they had previously held Shedd’s Belugas but was unaware the had taken the PWS Dolphins as well so thanks for pointing that out. The situation has changed in the last 14 years though. While they could likely take the Belugas again, I think that evolved care standards would likely prevent them from taking the Dolphins again though. There are also inherent risks with concentrating the population like that too.
Regarding other the Cetacean facilities like Minnesota, they are likely not as ready for it as you may think. Most such facilities (including Minnesota) have kept primarily warm-water tolerant species (usually Bottlenose Dolphins). Shedd’s keeps their cold-water Cetaceans at a comfy 50 Fahrenheit (10 Celsius). The cooling systems needed to achieve that level of cooling would cost millions to install in a facility that does not already have them. While it is possible for this to happen, it seems unlikely. But as you mentioned, the financial costs are the least of the problems with a transfer.
I have feeling that Shedd will release future plans for the Oceanarium as the current master plan nears completion, probably sometime in the next five – seven years. If they haven’t announced the next set of Oceanarium renovations by then, it will probably be a sign that they intend to discontinue their Cetacean program. While that would be a very unfortunate turn of events, it does seem to be the way things are trending currently.