Your exactly right. Managing our Fisheries to ensure "Waisted Fish" don't make it to gravel. Every fish has a price tag on it's head. They know they only need X number to spawn to ensure the run will sustain and they manage it down to the very last fish.
It comes down to money, not conservation.....

When is the last time you heard an Fisheries Manager or Biologist make the Statement, "We have to change our way of managing our Fisheries, we have way to many fish hitting the gravel"...

FireFish...