Do salmon eat other salmon

Answer 1

Cannibalism in salmon has not been registered to date.

I do not doubt that salmon would eat their own young, as most salmonids do (trout are notorious for turning "cannibal"), given the opportunity. However, salmon stop eating before returning to freshwater (their feeding teeth fall out also), otherwise a decent run would entirely decimate the fish stocks of their home river as they passed upstream. I have personally witnessed a male Atlantic salmon kill a salmon "parr" (juvenile salmon of approx. 6 inches), but this is as likely to be territorial behavior as any kind of feeding reflex.