Wild Steelhead are not corn, wheat, or cattle. They are not oranges, apples, or anything that we can control with expected specific outcomes and pounds delivered to market. Put them in a box and they will swim right out of it.
Even among anadromous fish, steelhead are the least predictable of any salmonid swimming the North Pacific. They are never a species of multitude, like Kings, Coho, or even Pinks, that come home in a rush of biological delivery to the rivers spanning the West Coast. They cruise along the edges, arriving to their natal rivers in fits and spurts, with dozens of life histories across each watershed. In short, there were never that many steelhead to begin with.