I live very near a small fresh water estuary and salmon hatchery in Washington state. This month, the Pacific salmon are swimming upstream to spawn. They are stunning; gorgeous silver scales with bands and spots of pink and green, even blue. They are much larger than I’d expected; many are well over a foot in size, and wider than the palm of my hand. These salmon have come from miles away, upstream, over rapids and falls and fish ladders to arrive at their original hatchery, where they jump over a series of fish ladders, to reach their home. There they will remain to spawn (and then die), or in some cases,…