After extensive research and reading, the obvious choice is Silver Perch which will grow well in the temperature ranges of my region. They appear to be hardy but are on the expensive side, from the local aquarium, as I don't need 100's of fingerlings. Tank 3 is all goldfish, as an ongoing source of biological cycles. The middle tank has a selection of both goldfish and brown feeder goldfish so 6 Silver Perch are housed there.
Rainbow Trout require a temperature range between 0-19 C and tend not to survive above 25C. I purchased 35 Rainbow Trout fingerlings and within that week we had temperatures above 28 C so I lost about 8-10 but the remaining stock is doing well in the third tank. They are on their own, no other fish and may put in a pump with a flow line that I will run under the house to help keep the temperatures lower than outdoor, by at least 10C during the hotter months. I am hopeful of success!
I did have Yabbies in this tank, started with 12, only 7 left. Although they had gained size, it was very apparent that I needed a much bigger area than 215 litres to breed them successfully to lunch size! They have since found a new home elsewhere.
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