I think the largest risk to wild salmon from salmon farms is disease transmission. It's not just sea lice. There's a very long list of viral and bacterial pathogens that we know are transmitted between wild and farmed salmon.
The current locations of the salmon farm tenures in British Columbia are on the main migration routes of some of the most significant salmon populations in Canada. The salmon farms are on a collision course with the wild salmon migrations twice a year. In the fall and summer, when the adult salmon return to spawn, they pass the salmon farms, and the farmed salmon are at risk for all those pathogens. In the spring, when the juvenile salmon migrate out to sea, they are at risk of infection from those pathogens that may be on the farmed salmon.
Spatial planning of aquaculture in British Columbia needs to be thought about very carefully, I think, certainly if there's continued development in the future. Particularly for the issue of Fraser River salmon stocks, I think, the collection of salmon farms around the Discovery Islands is a very big problem. Situating salmon farms in areas that are distant from wild salmon migration routes would be a key change that could be implemented.
Another one that I would recommend, which follows on the experience from Norway, is setting aside protected areas for salmon ecosystems where salmon-farming activity is prohibited. These would be marine protected areas where the wild salmon have no salmon farms that they are exposed to during their return and out-migration.