Great point cncfish!
The Troll fisheries from Vancouver north all have 28”size for marketing reasons that may have made sense 30 years ago.
If 20% of adult fish returning to spawn are below the size it would have little impact. If 70% of the fish returning to spawn are below this size then it has a huge impact! We are selectively breeding smaller Chinook every year.
It’s not just the troll fisheries, Sport, Gillnets, Orcas and Pinnipeds all prefer larger fish so that’s what we harvest.