Sg, or how about 20 C&R wild steelhead/year? At 5% mortality, that translates to 1 dead steelhead/year/angler. Each angler would have to record/punch every steelhead they land, wild and hatchery. After 20 wild's, you stop steelheading for the year. Hatchery fish are mandatory harvest up X/day, depending on the system. Get X/day, you are done for the day. This way, if one is seen releasing a fish, they had better have marked it as a wild or they should have kept it if was a hatchery fish. Release a fish that you didn't either mark on your card or keep, you are done for the year if caught. Pretty simple.