Somewhere in Briton they have a sardine ( or some fish ) that was harvested for several hundred years then collapsed so restrictions to rebuild. Did not happen because you can drive any living thing to the brink and then stop but the damage is done it does not recover. Good habitat is great but if you do not address what the root cause is, harvest for salmon, then it is window dressing. I think that is Tug's point. We have had the knowledge for some time for habitat and harvest.

Rule number one to stop exstintion of anything............ you have to stop killing it!!!