Amongst a lot of other interesting stuff at https://www.nca.gov.au/environment/lake-burley-griffin there is the latest report on fish management.

The native fish population in Lake Burley Griffin is enhanced through the regular seeding of fingerlings. Species such as Murray Cod and Golden Perch are released on an alternate basis to maintain a mixed recreational fishery. Read all about it in The Lake Burley Griffin Fish Survey 2023-24. https://www.nca.gov.au/sites/default/files/2025-02/2023-24%20Fisheries%20Survey%20for%20Lake%20Burley%20Griffin.pdf