It's a double edged sword because big plants require big harvests and wild fish cannot sustain the same harvest rates as the hatch product... unless you have a reliable low-impact means of SELECTIVELY harvesting the hatchery fish.
Thus far, the industry has virtually ZERO desire to move in that direction.
"Let every angler who loves to fish think what it would mean to him to find the fish were gone." (Zane Grey)
"If you don't kill them, they will spawn." (Carcassman)