I don't know if there's an acceptable definition of sustainable in anybody's world. But I think that increasing responsibility for the impacts of your operation, and, as much as possible, internalizing those impacts, would put us on the path to more sustainable operations, for sure. Rather than discharging waste into the ocean, deal with the waste, and possibly profit from the waste. All of those component pieces would add up to making the industry more sustainable.
I think it's fair to acknowledge there's a fundamental issue of sustainability around raising carnivores. Carnivorous fish need to consume species such as salmon and a certain percentage of wild fish meal and oil. The industry is working hard to bring that feed-conversion ratio down to one kilo of input to one kilo of output of protein, but they're not there yet.