When fishing for sturgeon in the Columbia River only fish between 40 and 60 inches can be kept. The bigger ones are the breeding stock and are release after they are brought to the boat if they dont break you off first.
With steelhead and salmon only hatchery fish can be retained and the wild ones must be released. I was fortunate to have landed a nice chrome hatchery steelhead on a fly the other weekend. That was some fine eating.