I think that's a challenging question.
There's an example in the central coast region of British Columbia. Indigenous organizations there and the Pacific Salmon Foundation looked at the question of what the best things would be to create the best benefits for salmon and what threats could be addressed most cost-effectively. I know that addressing barriers is one of the three. I don't recall what the other two are, so I can't compare how it ranks alongside those other two.
I can send you that report and follow up on that question.