I think the premium will be about 30% over the base price for current farmed fish. So yes, there is a premium. If the open net cages were charged a fee for dumping their waste into our oceans, I would say that probably their cost of production would be higher.
If you were to match the environmental footprint of a net cage to the environmental footprint of a closed containment farm, by, if you like, taking a fee on the difference between the two and their impact on the environment, I think you'd see the price come in much closer.