Its a shame Aussie zoos did not keep with the Siberians it appears that Tigers are a lot less common in our zoos these days apart from Australia zoo and Dreamworld!
Siberians weren't entirely unsuited to Wellington's climate either. It is indeed a shame we can't have two subspecies of tiger managed within the region's zoos.
Re. Sumatran tiger - there are currently thirteen holders in Australia (Adelaide Zoo, Australia Zoo, Ballarat Wildlife Park, Darling Downs Zoo, Dreamworld, Melbourne Zoo, Mogo Zoo, National Zoo, Perth Zoo, Sydney Zoo, Taronga Zoo; Tasmania Zoo, Taronga Western Plains Zoo); and two in New Zealand (Hamilton Zoo and Wellington Zoo).
Since 2010, we have lost three holders (Symbio Wildlife Park, Auckland Zoo and Orana Wildlife Park). In contrast, we have gained three holders - Darling Downs Zoo (2012), Ballarat Wildlife Park (2018) and Sydney Zoo (2019). Bearing in mind that the loss of Sumatran tigers at Auckland Zoo and Orana Wildlife Park is only temporary (so doesn't count), this amounts to a net gain of two facilities over the last decade.
Eight of the fifteen holders listed above have viable breeding pairs - and of these facilities, two have bred in the last year (Taronga Zoo and Australia Zoo); and another two are actively trying (Adelaide Zoo and Wellington Zoo).