Zoos that are the only one to hold a species.

They certainly are!

Dolphin Plunge® | Aquatica Orlando

In recent years, they'd been off exhibit at SeaWorld San Diego; perhaps that's where you got confused.

 

At the moment I think it is.

 

Please correct me if I'm wrong but is Cincinnati the only zoo with an aardwolf?

 

No.Some zoo in europe,including berlin and hamerton,have them.

 

Black Wallaroo, Nabarlek and Rock Ringtail Possum in Territory Wildlife Park should be the only ones in captivity. Saw all of them yestarday☺

 

Dibbler at Perth Zoo

 

Do any places other than the Georgia aquarium have beluga whales? I'm pretty sure there are, though I have no idea where

 

See this thread for beluga in us, in europe there is some in russia,ukraine,valencia(just check zootierliste),as well as four holders in japan and some in china.

 

Appart from the Europe and Asia ones, there are more belugas in North America than the Georgia ones: I've seen them in SeaWorld San Diego.

 

I've seen them in SeaWorld Orlando too and appearently SW San Antonio houses them as well.

 

@TeaLovingDave
I was confirmed by a zookeeper both species are being held separately and look a bit different. Norbit is the name for the only Nabarlek in captivity☺

 

And to fill in to that, Marineland in Canada has 51 beluga whales and more on the way.

 

Shedd Aquarium in Chicago has them

 

The first to really succeed was Okinawa and based on what I've been told it is not really that hard to keep: Plenty of space and feeding and you're well on the way. Initial problems (at Okinawa, too) were primarily related to these two. Several of the places keeping it today match these requirements, but unfortunately there are also a few keeping it in tanks that are highly insufficient.

Some info here but it is not up-to-date anymore:
Whale Shark Rhincodon typus Smith, 1828) in Captivity

By my count, the species is currently kept 9 places (1xUSA, 4xJapan, 4xChina). The species has never been kept at any of Tokyo's aquariums.

Speaking of Okinawa: A high percentage of the species kept in their deep water section are only kept there, but these are all medium to small species. Most major aquariums in Japan have some medium or small species that aren't kept elsewhere. And while we're at aquariums: I visited Blue Planet again recently when flying out of CPH and based on my count they have some 30 fish species that, as far as I know, are not kept at any other public aquarium/zoo (whitespotted bullhead shark; the remaining are freshwater, incl. a few undescribed species -- I'll provide a list if someone wants it). Some of these are present in very low numbers among private aquarists, however. Each of the major aquarium around the world, especially those with large freshwater sections, often have a few species not kept at other public aquarium/zoo.

 

Would really be intresting because 30 species not kept at other public places is quite a number !

 

Welt der Gifte is currently the only facility in Europe showcasing Crotalus ornatus, at least according to ZTL.

 

Fort Worth Zoo has pecos pupfish and spot tailed earless lizards, two native species that are being bred there. Several other zoos likely are the only holders of native species in a similar manor.

 

Species marked with a star I suspect, but am not certain. Total is 38 if including species with stars, 26 if excluding species with stars. There are a handful of other species (a few Synodontis catfish, a few Malawi cichlids, an African dwarf cichlid, an elephantfish and a Brycon) that also might be unique as I have never seen them elsewhere or heard of public aquariums with them, but for various reasons I am less certain about those and have chosen not to list them below. As I said in my previous comment, a few of the freshwater are present in very low numbers among private aquarists.

Saltwater: Whitespotted bullhead shark (Heterodontus ramalheira).

Freshwater:
-Catfish: Auchenoglanis biscutatus*, Bagrus meridionalis*, Brachyplatystoma capapretum*, Brachyplatystoma rousseauxii*, Hemiodontichthys acipenserinus, Hypostomus latifrons, Hypostomus luteomaculatus, Hypostomus margaritifer*, Hypostomus sp. "Iguazu", Microsynodontis sp. "Nigeria"*, Neosilurus ater*, Otocinclus mimulus, Platynematichthys notatus*, Platysilurus mucosus, Pterosturisoma microps, Rhinelepis strigosa, Spatuloricaria caquetae, Spatuloricaria sp. "Rio Nanay", Tenellus trimaculatus.
-Characiforms: Characidium phoxocephalum, Chrysobrycon yoliae, Hyphessobrycon saizi*, Pseudanos winterbottomi.
-Cypriniforms: Enteromius pellegrini, Labeobarbus acuticeps, Labeobarbus leleupanus, Sewellia monolobata*.
-Cichlids: Apistogramma sp "Rio Abacaxis"*, Chaetobranchus flavescens, Cichlasoma sp. "Rio Curaray", Crenicichla [cf.] lugubris "redface" (I think Tocantins?; should not be confused with the Crenicichla [cf.] lugubris Atabapo in the adjacent aquarium; note that the type locality of lugubris is Rio Negro), Lethrinops altus, Krobia xinguensis, Serranochromis robustus, Taeniolethrinops praeorbitalis.
-Neotropical knifefish: Orthosternarchus tamandua.