I would say that I don't know if you need more studies, but you need more engagement with the various peoples.
The way I would answer your question is to say that through various technologies such as the fish weir.... My great-grandmother taught me about the fish weir. Her name was Mary Hayes. This was a technology that was used to meet our needs but also to cultivate more abundancy in the system.
From a Nuu-chah-nulth perspective, economic engagement with the environment is not about sustainability. It's about creating more abundancy in the system. It's like pruning a tree at the right time of year. It's possible to do that.