"Data from BC indicate that wild steelhead release fisheries on winter steelhead stocks exert a minimal influence on the ability of the fish to spawn and refute claims that caught and released steelhead were effectively lost from the population"

The following conclusions from the study were drawn:
Hooking mortality of steelhead ranged between 0 and 6 percent in 11 Canadian river basins over a 7 year period with a Province-wide average of 3.6 percent.
Hooking mortality of winter-run steelhead averages between 2 and 3 percent using barbless hooks, regardless of whether bait is used.(Remember this is winter run steelhead)
Barbed hooks appear to be the largest contributor to hooking mortality.
The great majority of released fish make it to spawning grounds and spawn.
Use of resident salmonid hooking mortality data is not applicable to steelhead in freshwater."

These are conclusions driven from a scientific study in BC on steelhead, but the real message is to take the time to really learn and practice proper C&R skills.