Back when I was involved in Harvest we actually used the hatchery data to manage fisheries. But that was then.

Friend of mine who was an active fly fisher for all things salmonid used to say that if you tied a 20 pound steelhead and 20 pound chum tail to tail that the chime would drag the steelhead all over the river. Only really big chum I ever hooked on a fly had absolutely no idea he was hooked. He just swam away.