I'm located in Sydney, was trying to get some pricing to see if it was worthwhile and the profit margins were decent.Where in oz are you? There's a few stores here in vic which import fish. It might be easier to talk to them, they could possibly get what you need from Asia. Alsothey have proper quarantine facilities too so can take care of that side of things for you .
I imagine importing fish into oz isn't cheap or easy however you do it.