I agree with you that salmon farming most definitely has impacts on both the environment and wild salmon stocks. However, I can’t quite wrap my head around your argument of genetic diversity. I agree that strong genetic diversity is important. In salmon this has alowed them to adapt and specialize to a wide aray of stream conditions. However there is only so much genetic diversity in a given natal stream. The same decendents of the same salmon have been returning to the same stream for a long time. There already potential for the gene pool to get diluted. Straying of salmon from other streams actually increases the gene pool in that specific stream. Not looking to start an argument just give a different view of genetic diversity in salmon.
“Friends don’t let friends eat farmed fish”