Out of curiosity would an Australian captive marine mammal population thread be viable to make on here? That would be super interesting!
It’s a good idea, but Sea World refused to provide me with information on their pinnipeds when I tried to make a pinniped population list a few years ago.
Polar bears are covered in the bear population list; and Taronga’s pinnipeds are covered in this thread:
Taronga Zoo's fur seals and sea lions [Taronga Zoo]