I should have some photos, need to find an old disk drive, a laptop having headed south in dramatic fashion.
Ponds are nice. You need a pump with a filter to remove algae from the water, the outlet can be above water level giving a little fountain effect.
To get this back On Topic—I will have to research what fish native to Tasmania could be kept in a pond. No carp!
A catfish as “top predator” may be needed. Apparently the sort that can go in ponds, can’t remember the name now, sorry, is lazy, I was told that before long I could drop food pellets straight into its mouth, even rub its belly

Just have to site the pond near the gazebo and where it won’t cut down on the Chill Hours a tree needs to come out of dormancy! Fortunately Granny Smith and Stella cherry trees need few chill hours.
Imagine a cherry tree in full blossom reflected in the pond!