In response to Stonefish, you need to quit killing them in the ocean to get them to come back. WDF used to plant out coho fry to backfill for over harvest of the wild stocks. It added some fish to the fishery.

Fry planting was stopped for a number of reasons. Hatchery'wild interactions being one. Money probably being another.

At the end of the day, the hatchery supported salmon runs are much easier to manage.