If those salmon are too docile, just give them cocaine.

https://www.science.org/content/article/cocaine-pollution-gi...

That's surprisingly easy. It's been done for chickens. All that was necessary was to put groups of chickens in cages, and keep only the cage groups that were the best egg-layers. After only a few generations, chicken-on-chicken violence was way down.

>docile salmon

Hmm… that made me think of domestication, do you think we could ever have salmon as pets? What’s their character like? More like dogs or cats?