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There are already many aquaculture pens in the ocean near Port Lincoln, South Australia, often for tuna. You see them from the air when flying over. Here's a ph

• mastax 5y ago
  The issue is that many of the desirable farmed fish like tuna and salmon are carnivores. Farming them still requires catching mass quantities of less-commercially-useful fish along with the issues that has. Edit: I should say part of the issue. There are other ecological concerns with farmed fish.
  • throwtheacctawy 5y ago
    That and the flesh eating parasites eating the farmed fish alive. So the inputs are unsustainable. The output yields are unreliable, and not able to meet demand. It isn't clear how much better fish farms are for the environment.