I wonder if these concerns are misplaced. There has been much media in relation to the quality or safety of imported fish, but this has been spread by vested interest groups (such as fish associations and Australia fishers).
The quality of imported (and local) fish is tested and meets Australian quality requirements.
Furthermore, many Australia fish are not grown in ‘pristine’ coastal waters and are often farmed in off stream saltwater dams (from water extracted from local marine estuaries). In many respects, the water quality could be comparable to many overseas farms.
There has also been scares about potential health consequences of eating imported fish…but interesting enough, the Australian fish and fish farming industry have not been immune to health/pathogen outbreaks from time to time. It is just the imported fishes which seem to generate better ratings and community interest.
There are however advantages of buying Australian such as supporting local employment, potentially fresher and also keeping our dollars at home.