Gurkan Yeniceri wrote:We get rainbow trout in Canberra and that is the best suited fish to our climate.

We can also get Silver perch and Tandanus Catfish which may survive winter temps.

Survival and being efficient for practical aquaponics are different criteria. When I can use a large enough tank or dam I will run some sort of aquaculture with sliver perch. In contained highly productive aquaponics tilapia are far superior in many situations. Crayfish species are another option, but there are practical and legal issues here.