None.
This facility once held a young female named Lora, alongside at least one other walrus, who I believe to have been the same individual currently housed at Moskvarium. Therefore I make the assumption that Moscow's herd of walruses all came from this facility, though this information is as of yet unconfirmed.
This facility received seven walruses, three males and four females, from the Moscow Dolphinarium in 2010. While two of the walruses were transferred to Ukraine, the fate of the remaining five walruses is not known to me at this time.