Hi Ray,
Sorry for the late reply, I am still trying to catch up from my end of year leave.
Unfortunately you are not permitted to eat tilapia or any other declared noxious fish in Queensland, including carp. The Fisheries Act states that if any declared noxious fish are caught they are to be killed immediately and placed in a bin or buried as soon as possible. You are not permitted to take the whole fish or any part of the fish away from the water body at all (including fillets). The reason why we have this rule is we still only have tilapia in 17 of our 76 catchments in Queensland. If we allowed people to utilise noxious fish we would see individuals illegally stocking their farm dams and releasing noxious fish in their local waterways for their own use, as is the case with red claw crayfish. It is illegal to move these fish around, you are not to have them in your possession at all (including parts of the fish) other than the short amount of time it takes to kill them and dispose of them at the site. It is also illegal to release them back into the water. The maximum penalty for the possession of noxious fish (including parts of the fish like fillets) is $200,000.
Seqwater have informed me they have disposal bins for tilapia at North Pine Dam. They may not be exactly where you are fishing however and therefore you would be permitted to have these fish in your possession until you reached the disposal facilities.
I hope this information has been helpful, please do not hesitate to contact me if you require any further information.