Salmo nailed it. Sam Wright tried to get folks to consider all human-induced mortality as "harvest".

Start with eggs. Before all the sediment was introduced to streams, egg-fry survival maybe have been 50-60% or more. Maybe like what is seen in a a spawning channel. Move ahead to Chinook; a popular fish that makes little long-term use of FW. If egg-fry now is in the 10-20% range due to sediment in the gravel then we are putting something like one third the smolts out. So, instead of harvest, we take that mortality as logging, roads, or other sediment movers. Factor in the loss of fish due to use of water for non-stream uses. We keep making choices, and the generally come at the expense of natural resources.