I’m only asking because i’m thinking it’s possible to rebuild stocks while allowing fishing. By using out of basin stock is like using opposing magnets but in basin stocks would be like a magnet on metal. So then you increase the numbers of in basin fish and they will spawn with native fish. The whole point of the hatchery would be to increase numbers of native fish with a side affect of increased catches. If it works why not increase the load as much as possible every few years and see if the actual spawners increase too.
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Why build in the flood plain?