An Australian perspective on a few of the threatened turtles in captivity:
*Alexandra Park Zoo, north of Brisbane here in Australia, has a White-throated Snapping Turtle (
Elseya albagula). It is believed to be the only one in a zoo currently and it moved from another local collection:
Alby the bum breather welcomed to zoo – Bundaberg Now The
Environment Protection and Biodiversity Conservation Act 1999 (Commonwealth) lists this species as critically endangered. More information can be found here:
https://www.environment.gov.au/syst...overy-plan-white-throated-snapping-turtle.pdf
*Taronga Zoo does great work with the Bellinger River Turtle (
Myuchelys georgesi) via their breed and release programme. The species was almost wiped out of existence in 2015 when 90% of the adult population died of disease. Fortunately, the zoo collected the last few adults and have been very successful with them. They had one on display in the reptile house when I visited a year or so ago. Symbio Wildlife Park also works with this species to establish a second captive population. Article about them:
Critically endangered snapping turtle program breeds hope for survival
*Australian Reptile Park works with a close relative of the Bellinger River Turtle - the Manning River Turtle (
Myuchelys purvisi). They breed them off-display:
Ten tiny Manning River turtle hatchlings provide hope for species
*Several zoos led by Perth Zoo also look after and breed the Western Swamp Turtle (
Pseudemydura umbrina). Perth Zoo have bred 900 of them since they commenced in 1989 with 741 of them being released into the wild:
Western Swamp Tortoise Breeding Program
*Mary River Turtles (
Elusor macrurus) are also relatively common in Australian zoos as well (at least in Queensland collections); I have seen the this species locally at Currumbin Wildlife Sanctuary, Lone Pine Koala Sanctuary, David Fleay Wildlife Park and Australia Zoo.