[tastyfreeze]

I wish I could find the selective breeding paper I read years ago. It is as you say. The human practice of keeping the largest fish in both sport and commercial catches is to blame. A 75 year king salmon derby here shows progressively smaller fish winning every year. Its not really hard to reason that if you kill the big fish before they breed the fish are going to get smaller.

We even see short unnaturally fat fish that are just under the minimum length that has been the same for 30+ years. The gene pool is being pressured to shorter fish for survival.